Simon McVittie による報告：

- 4 バイトのヒープバッファオーバーランにつながる、cmsg メッセージのパディング内の追加　fb を受け入れません（CVE-2014-3635）。

1 メッセージにつき渡される Unix ファイル記述子のデフォルトの最大数を 1024 から 16 に減らすと、最大接続数がデフォルトの uid がシステムバスのファイル記述子を Linux のデフォルトリミット以下まで、消費せずに済みます（CVE-2014-3636）。

新たな構成リミット pending_fd_timeout（デフォルト：150 秒）後も fd 保留アンマーシャリングを有している接続を切断すると、接続のファイル記述子に対する循環参照を設定して切断できなくする悪用しうる接続が作成される可能性がなくなります（CVE-2014-3637）。

1 接続あたりのデフォルトの最大保留応答数を 8192 から 128 に減らすと、アルゴリズムの複雑性によるサービス拒否攻撃が緩和されます（CVE-2014-3638）。

システムバスのデフォルトの認証タイムアウトを 30 秒から 5 秒に短縮すると、未認証のすべての接続スロットを使用するサービス拒否を回避できます。未認証の接続スロットがすべてなくなった場合は、新たな接続試行を切断するのではなく、ブロックしてください（CVE-2014-3639）。

リモートの Ubuntu 14.04 LTS ホストには、USN-2352-1 のアドバイザリに記載された複数の脆弱性の影響を受けるパッケージがインストールされています。

    Simon McVittie 氏は、DBus がファイル記述子メッセージ制限を不適切に処理していたことを発見しました。ローカルの攻撃者が、この問題を利用して Dbus をクラッシュさせ、サービス拒否または任意のコードの実行を引き起こす可能性があります。この問題が該当するのはUbuntu 12.04 LTSとUbuntu 14.04 LTSのみです。(CVE-2014-3635)

    Alban Crequy 氏は、DBus が大量のファイル記述子メッセージを不適切に処理していたことを発見しました。ローカルの攻撃者が、この問題を悪用して、Dbus の応答を停止し、サービス拒否を引き起こす可能性があります。この問題が該当するのはUbuntu 12.04 LTSとUbuntu 14.04 LTSのみです。(CVE-2014-3636)

    Alban Crequy 氏は、DBus が特定のファイル記述子メッセージを不適切に処理していたことを発見しました。ローカルの攻撃者が、この問題を利用して DBus に永続的な接続を維持させ、サービス拒否を引き起こす可能性があります。この問題が該当するのはUbuntu 12.04 LTSとUbuntu 14.04 LTSのみです。(CVE-2014-3637)

    Alban Crequy 氏は、DBus が大量のパラレルの接続およびパラレルのメッセージ呼び出しを不適切に処理していたことを発見しました。ローカルの攻撃者が、この問題を利用して DBus にリソースを消費させ、サービス拒否を引き起こす可能性があります。(CVE-2014-3638)

    Alban Crequy 氏は、DBus が不完全な接続を不適切に処理していたことを発見しました。ローカルの攻撃者が、この問題を利用して DBus に正当な接続試行を失敗させ、サービス拒否を引き起こす可能性があります。
    (CVE-2014-3639)

Tenable は、前述の説明ブロックを Ubuntu セキュリティアドバイザリからすでに直接抽出しています。

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ依存していることに注意してください。

1.6.28 への更新

注意：Tenable Network Security は、前述の記述ブロックを Fedora セキュリティアドバイザリから直接抽出しています。Tenable では、できる限り新たな問題を持ち込まないように、自動的に整理して書式設定するようにしています。

Updated dbus packages fixes the following security issues :

Alban Crequy and Simon McVittie discovered several vulnerabilities in the D-Bus message daemon :

On 64-bit platforms, file descriptor passing could be abused by local users to cause heap corruption in dbus-daemon, leading to a crash, or potentially to arbitrary code execution (CVE-2014-3635).

A denial-of-service vulnerability in dbus-daemon allowed local attackers to prevent new connections to dbus-daemon, or disconnect existing clients, by exhausting descriptor limits (CVE-2014-3636).

Malicious local users could create D-Bus connections to dbus-daemon which could not be terminated by killing the participating processes, resulting in a denial-of-service vulnerability (CVE-2014-3637).

dbus-daemon suffered from a denial-of-service vulnerability in the code which tracks which messages expect a reply, allowing local attackers to reduce the performance of dbus-daemon (CVE-2014-3638).

dbus-daemon did not properly reject malicious connections from local users, resulting in a denial-of-service vulnerability (CVE-2014-3639).

The patch issued by the D-Bus maintainers for CVE-2014-3636 was based on incorrect reasoning, and does not fully prevent the attack described as CVE-2014-3636 part A, which is repeated below. Preventing that attack requires raising the system dbus-daemon's RLIMIT_NOFILE (ulimit -n) to a higher value.

By queuing up the maximum allowed number of fds, a malicious sender could reach the system dbus-daemon's RLIMIT_NOFILE (ulimit -n, typically 1024 on Linux). This would act as a denial of service in two ways :

  - new clients would be unable to connect to the     dbus-daemon

    - when receiving a subsequent message from a       non-malicious client that contained a fd, dbus-daemon       would receive the MSG_CTRUNC flag, indicating that the       list of fds was truncated; kernel fd-passing APIs do       not provide any way to recover from that, so       dbus-daemon responds to MSG_CTRUNC by disconnecting       the sender, causing denial of service to that sender.

This update also resolves the CVE-2014-7824 security vulnerability.

Update to 1.6.28

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the dbus packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - D-BUS is a system for sending messages between     applications. It is used both for the system-wide     message bus service, and as a per-user-login-session     messaging facility.

  - Security Fix(es)

  - dbus 1.3.0 before 1.6.22 and 1.8.x before 1.8.6, when     running on Linux 2.6.37-rc4 or later, allows local     users to cause a denial of service (system-bus     disconnect of other services or applications) by     sending a message containing a file descriptor, then     exceeding the maximum recursion depth before the     initial message is forwarded.(CVE-2014-3532)

  - dbus 1.3.0 before 1.6.22 and 1.8.x before 1.8.6 allows     local users to cause a denial of service (disconnect)     via a certain sequence of crafted messages that cause     the dbus-daemon to forward a message containing an     invalid file descriptor.(CVE-2014-3533)

  - D-Bus 1.4.x through 1.6.x before 1.6.30, 1.8.x before     1.8.16, and 1.9.x before 1.9.10 does not validate the     source of ActivationFailure signals, which allows local     users to cause a denial of service (activation failure     error returned) by leveraging a race condition     involving sending an ActivationFailure signal before     systemd responds.(CVE-2015-0245)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x     before 1.8.8 allows local users to (1) cause a denial     of service (prevention of new connections and     connection drop) by queuing the maximum number of file     descriptors or (2) cause a denial of service     (disconnect) via multiple messages that combine to have     more than the allowed number of file descriptors for a     single sendmsg call.(CVE-2014-3636)

  - The dbus-daemon in D-Bus 1.2.x through 1.4.x, 1.6.x     before 1.6.20, and 1.8.x before 1.8.4, sends an     AccessDenied error to the service instead of a client     when the client is prohibited from accessing the     service, which allows local users to cause a denial of     service (initialization failure and exit) or possibly     conduct a side-channel attack via a D-Bus message to an     inactive service.(CVE-2014-3477)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x     before 1.8.8 does not properly close connections for     processes that have terminated, which allows local     users to cause a denial of service via a D-bus message     containing a D-Bus connection file     descriptor.(CVE-2014-3637)

  - Off-by-one error in D-Bus 1.3.0 through 1.6.x before     1.6.24 and 1.8.x before 1.8.8, when running on a 64-bit     system and the max_message_unix_fds limit is set to an     odd number, allows local users to cause a denial of     service (dbus-daemon crash) or possibly execute     arbitrary code by sending one more file descriptor than     the limit, which triggers a heap-based buffer overflow     or an assertion failure.(CVE-2014-3635)

  - The bus_connections_check_reply function in     config-parser.c in D-Bus before 1.6.24 and 1.8.x before     1.8.8 allows local users to cause a denial of service     (CPU consumption) via a large number of method     calls.(CVE-2014-3638)

  - The dbus-daemon in D-Bus before 1.6.24 and 1.8.x before     1.8.8 does not properly close old connections, which     allows local users to cause a denial of service     (incomplete connection consumption and prevention of     new connections) via a large number of incomplete     connections.(CVE-2014-3639)

  - D-Bus 1.3.0 through 1.6.x before 1.6.26, 1.8.x before     1.8.10, and 1.9.x before 1.9.2 allows local users to     cause a denial of service (prevention of new     connections and connection drop) by queuing the maximum     number of file descriptors. NOTE: this vulnerability     exists because of an incomplete fix for     CVE-2014-3636.1.(CVE-2014-7824)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

DBUS-1 was upgraded to upstream release 1.8.

This brings the version of dbus to the latest stable release from an unstable snapshot 1.7.4 that is know to have several regressions

  - Upstream changes since 1.7.4 :

  + Security fixes :

  - Do not accept an extra fd in the padding of a cmsg     message, which could lead to a 4-byte heap buffer     overrun. (CVE-2014-3635, fdo#83622; Simon McVittie)

  - Reduce default for maximum Unix file descriptors passed     per message from 1024 to 16, preventing a uid with the     default maximum number of connections from exhausting     the system bus' file descriptors under Linux's default     rlimit. Distributors or system administrators with a     restrictive fd limit may wish to reduce these limits     further. Additionally, on Linux this prevents a second     denial of service in which the dbus-daemon can be made     to exceed the maximum number of fds per sendmsg() and     disconnect the process that would have received them.
    (CVE-2014-3636, fdo#82820; Alban Crequy)

  - Disconnect connections that still have a fd pending     unmarshalling after a new configurable limit,     pending_fd_timeout (defaulting to 150 seconds), removing     the possibility of creating an abusive connection that     cannot be disconnected by setting up a circular     reference to a connection's file descriptor.
    (CVE-2014-3637, fdo#80559; Alban Crequy)

  - Reduce default for maximum pending replies per     connection from 8192 to 128, mitigating an algorithmic     complexity denial-of-service attack (CVE-2014-3638,     fdo#81053; Alban Crequy)

  - Reduce default for authentication timeout on the system     bus from 30 seconds to 5 seconds, avoiding denial of     service by using up all unauthenticated connection     slots; and when all unauthenticated connection slots are     used up, make new connection attempts block instead of     disconnecting them. (CVE-2014-3639, fdo#80919; Alban     Crequy)

  - On Linux >0 2.6.37-rc4, if sendmsg() fails with     ETOOMANYREFS, silently drop the message. This prevents     an attack in which a malicious client can make     dbus-daemon disconnect a system service, which is a     local denial of service. (fdo#80163, CVE-2014-3532;
    Alban Crequy)

  - Track remaining Unix file descriptors correctly when     more than one message in quick succession contains fds.
    This prevents another attack in which a malicious client     can make dbus-daemon disconnect a system service.
    (fdo#79694, fdo#80469, CVE-2014-3533; Alejandro     Mart&iacute;nez Su&aacute;rez, Simon McVittie, Alban     Crequy)

  - Alban Crequy at Collabora Ltd. discovered and fixed a     denial-of-service flaw in dbus-daemon, part of the     reference implementation of D-Bus. Additionally, in     highly unusual environments the same flaw could lead to     a side channel between processes that should not be able     to communicate. (CVE-2014-3477, fdo#78979)

  + Other fixes and enhancements :

  - Check for libsystemd from systemd >= 209, falling back     to the older separate libraries if not found (Umut     Tezduyar Lindskog, Simon McVittie)

  - On Linux, use prctl() to disable core dumps from a test     executable that deliberately raises SIGSEGV to test     dbus-daemon's handling of that condition (fdo#83772,     Simon McVittie)

  - Fix compilation with --enable-stats (fdo#81043, Gentoo     #507232; Alban Crequy)

  - Improve documentation for running tests on Windows     (fdo#41252, Ralf Habacker)

  - When dbus-launch --exit-with-session starts a     dbus-daemon but then cannot attach to a session, kill     the dbus-daemon as intended (fdo#74698,     &#x420;&#x43E;&#x43C;&#x430;&#x43D;
    &#x414;&#x43E;&#x43D;&#x447;&#x435;&#x43D;&#x43A;&#x43E;
    )

  - in the CMake build system, add some hints for Linux     users cross-compiling Windows D-Bus binaries to be able     to run tests under Wine (fdo#41252, Ralf Habacker)

  - add Documentation key to dbus.service (fdo#77447,     Cameron Norman)

  - in 'dbus-uuidgen --ensure', try to copy systemd's     /etc/machine-id to /var/lib/dbus/machine-id instead of     generating an entirely new ID (fdo#77941, Simon     McVittie)

  - if dbus-launch receives an X error very quickly, do not     kill unrelated processes (fdo#74698,     &#x420;&#x43E;&#x43C;&#x430;&#x43D;
    &#x414;&#x43E;&#x43D;&#x447;&#x435;&#x43D;&#x43A;&#x43E;
    )

  - on Windows, allow up to 8K connections to the     dbus-daemon, instead of the previous 64 (fdo#71297;
    Cristian Onet, Ralf Habacker)

  - cope with \r\n newlines in regression tests, since on     Windows, dbus-daemon.exe uses text mode (fdo#75863,     &#x420;&#x443;&#x441;&#x43B;&#x430;&#x43D;
    &#x418;&#x436;&#x431;&#x443;&#x43B;&#x430;&#x442;&#x43E;
    &#x432;)

  - Enhance the CMake build system to check for GLib and     compile/run a subset of the regression tests (fdo#41252,     fdo#73495; Ralf Habacker)

  - don't rely on va_copy(), use DBUS_VA_COPY() wrapper     (fdo#72840, Ralf Habacker)

  - fix compilation of systemd journal support on older     systemd versions where sd-journal.h doesn't include     syslog.h (fdo#73455, Ralf Habacker)

  - fix compilation on older MSVC versions by including     stdlib.h (fdo#73455, Ralf Habacker)

  - Allow <allow_anonymous/> to appear in an included     configuration file (fdo#73475, Matt Hoosier)

  - If the tests crash with an assertion failure, they no     longer default to blocking for a debugger to be     attached. Set DBUS_BLOCK_ON_ABORT in the environment if     you want the old behaviour.

  - To improve debuggability, the dbus-daemon and     dbus-daemon-eavesdrop tests can be run with an external     dbus-daemon by setting DBUS_TEST_DAEMON_ADDRESS in the     environment. Test-cases that require an     unusually-configured dbus-daemon are skipped.

  - don't require messages with no INTERFACE to be     dispatched (fdo#68597, Simon McVittie)

  - document 'tcp:bind=...' and 'nonce-tcp:bind=...'     (fdo#72301, Chengwei Yang)

  - define 'listenable' and 'connectable' addresses, and     discuss the difference (fdo#61303, Simon McVittie)

  - support printing Unix file descriptors in dbus-send,     dbus-monitor (fdo#70592, Robert Ancell)

  - don't install systemd units if --disable-systemd is     given (fdo#71818, Chengwei Yang)

  - don't leak memory on out-of-memory while listing     activatable or active services (fdo#71526, Radoslaw     Pajak)

  - fix undefined behaviour in a regression test (fdo#69924,     DreamNik)

  - escape Unix socket addresses correctly (fdo#46013,     Chengwei Yang)

  - on SELinux systems, don't assume that SECCLASS_DBUS,     DBUS__ACQUIRE_SVC and DBUS__SEND_MSG are numerically     equal to their values in the reference policy     (fdo#88719, osmond sun)

  - define PROCESS_QUERY_LIMITED_INFORMATION if missing from     MinGW < 4 headers (fdo#71366, Matt Fischer)

  - define WIN32_LEAN_AND_MEAN to avoid conflicts between     winsock.h and winsock2.h (fdo#71405, Matt Fischer)

  - do not return failure from _dbus_read_nonce() with no     error set, preventing a potential crash (fdo#72298,     Chengwei Yang)

  - on BSD systems, avoid some O(1)-per-process memory and     fd leaks in kqueue, preventing test failures (fdo#69332,     fdo#72213; Chengwei Yang)

  - fix warning spam on Hurd by not trying to set     SO_REUSEADDR on Unix sockets, which doesn't do anything     anyway on at least Linux and FreeBSD (fdo#69492, Simon     McVittie)

  - fix use of TCP sockets on FreeBSD and Hurd by tolerating     EINVAL from sendmsg() with SCM_CREDS (retrying with     plain send()), and looking for credentials more     correctly (fdo#69492, Simon McVittie)

  - ensure that tests run with a temporary XDG_RUNTIME_DIR     to avoid getting mixed up in XDG/systemd 'user sessions'     (fdo#61301, Simon McVittie)

  - refresh cached policy rules for existing connections     when bus configuration changes (fdo#39463, Chengwei     Yang)

  - If systemd support is enabled, libsystemd-journal is now     required.

  - When activating a non-systemd service under systemd,     annotate its stdout/stderr with its bus name in the     Journal. Known limitation: because the socket is opened     before forking, the process will still be logged as if     it had dbus-daemon's process ID and user ID. (fdo#68559,     Chengwei Yang)

  - Document more configuration elements in dbus-daemon(1)     (fdo#69125, Chengwei Yang)

  - Don't leak string arrays or fds if     dbus_message_iter_get_args_valist() unpacks them and     then encounters an error (fdo#21259, Chengwei Yang)

  - If compiled with libaudit, retain CAP_AUDIT_WRITE so we     can write disallowed method calls to the audit log,     fixing a regression in 1.7.6 (fdo#49062, Colin Walters)

  - path_namespace='/' in match rules incorrectly matched     nothing; it now matches everything. (fdo#70799, Simon     McVittie)

  - Directory change notification via dnotify on Linux is no     longer supported; it hadn't compiled successfully since     2010 in any case. If you don't have inotify (Linux) or     kqueue (*BSD), you will need to send SIGHUP to the     dbus-daemon when its configuration changes. (fdo#33001,     Chengwei Yang)

  - Compiling with --disable-userdb-cache is no longer     supported; it didn't work since at least 2008, and would     lead to an extremely slow dbus-daemon even it worked.
    (fdo#15589, fdo#17133, fdo#66947; Chengwei Yang)

  - The DBUS_DISABLE_ASSERTS CMake option didn't actually     disable most assertions. It has been renamed to     DBUS_DISABLE_ASSERT to be consistent with the Autotools     build system. (fdo#66142, Chengwei Yang)

  - --with-valgrind=auto enables Valgrind instrumentation if     and only if valgrind headers are available. The default     is still

    --with-valgrind=no. (fdo#56925, Simon McVittie)

  - Platforms with no 64-bit integer type are no longer     supported. (fdo#65429, Simon McVittie)

  - GNU make is now (documented to be) required. (fdo#48277,     Simon McVittie)

  - Full test coverage no longer requires dbus-glib,     although the tests do not exercise the shared library     (only a static copy) if dbus-glib is missing.
    (fdo#68852, Simon McVittie)

  - D-Bus Specification 0.22

  - Document GetAdtAuditSessionData() and     GetConnectionSELinuxSecurityContext() (fdo#54445, Simon)

  - Fix example .service file (fdo#66481, Chengwei Yang)

  - Don't claim D-Bus is 'low-latency' (lower than what?),     just give factual statements about it supporting async     use (fdo#65141, Justin Lee)

  - Document the contents of .service files, and the fact     that system services' filenames are constrained     (fdo#66608; Simon McVittie, Chengwei Yang)

  - Be thread-safe by default on all platforms, even if     dbus_threads_init_default() has not been called. For     compatibility with older libdbus, library users should     continue to call dbus_threads_init_default(): it is     harmless to do so. (fdo#54972, Simon McVittie)

  - Add GetConnectionCredentials() method (fdo#54445, Simon)

  - New API: dbus_setenv(), a simple wrapper around     setenv(). Note that this is not thread-safe. (fdo#39196,     Simon)

  - Add dbus-send --peer=ADDRESS (connect to a given     peer-to-peer connection, like --address=ADDRESS in     previous versions) and dbus-send --bus=ADDRESS (connect     to a given bus, like dbus-monitor

    --address=ADDRESS). dbus-send --address still exists for     backwards compatibility, but is no longer documented.
    (fdo#48816, Andrey Mazo)

  - 'dbus-daemon --nofork' is allowed on Windows again.
    (fdo#68852, Simon McVittie)

  - Avoid an infinite busy-loop if a signal interrupts     waitpid() (fdo#68945, Simon McVittie)

  - Clean up memory for parent nodes when objects are     unexported (fdo#60176, Thomas Fitzsimmons)

  - Make dbus_connection_set_route_peer_messages(x, FALSE)     behave as documented. Previously, it assumed its second     parameter was TRUE. (fdo#69165, Chengwei Yang)

  - Escape addresses containing non-ASCII characters     correctly (fdo#53499, Chengwei Yang)

  - Document <servicedir> search order correctly (fdo#66994,     Chengwei Yang)

  - Don't crash on 'dbus-send --session / x.y.z' which     regressed in 1.7.4. (fdo#65923, Chengwei Yang)

  - If malloc() returns NULL in _dbus_string_init() or     similar, don't free an invalid pointer if the string is     later freed (fdo#65959, Chengwei Yang)

  - If malloc() returns NULL in dbus_set_error(), don't     va_end() a va_list that was never va_start()ed     (fdo#66300, Chengwei Yang)

  - fix build failure with --enable-stats (fdo#66004,     Chengwei Yang)

  - fix a regression test on platforms with strict alignment     (fdo#67279, Colin Walters)

  - Avoid calling function parameters 'interface' since     certain Windows headers have a namespace-polluting macro     of that name (fdo#66493, Ivan Romanov)

  - Assorted Doxygen fixes (fdo#65755, Chengwei Yang)

  - Various thread-safety improvements to static variables     (fdo#68610, Simon McVittie)

  - Make 'make -j check' work (fdo#68852, Simon McVittie)

  - Fix a NULL pointer dereference on an unlikely error path     (fdo#69327, Sviatoslav Chagaev)

  - Improve valgrind memory pool tracking (fdo#69326,     Sviatoslav Chagaev)

  - Don't over-allocate memory in dbus-monitor (fdo#69329,     Sviatoslav Chagaev)

  - dbus-monitor can monitor dbus-daemon < 1.5.6 again     (fdo#66107, Chengwei Yang)

  - If accept4() fails with EINVAL, as it can on older Linux     kernels with newer glibc, try accept() instead of going     into a busy-loop. (fdo#69026, Chengwei Yang)

  - If socket() or socketpair() fails with EINVAL or     EPROTOTYPE, for instance on Hurd or older Linux with a     new glibc, try without SOCK_CLOEXEC. (fdo#69073; Pino     Toscano, Chengwei Yang)

  - Fix a file descriptor leak on an error code path.
    (fdo#69182, Sviatoslav Chagaev)

  - dbus-run-session: clear some unwanted environment     variables (fdo#39196, Simon)

  - dbus-run-session: compile on FreeBSD (fdo#66197,     Chengwei Yang)

  - Don't fail the autolaunch test if there is no DISPLAY     (fdo#40352, Simon)

  - Use dbus-launch from the builddir for testing, not the     installed copy (fdo#37849, Chengwei Yang)

  - Fix compilation if writev() is unavailable (fdo#69409,     Vasiliy Balyasnyy)

  - Remove broken support for LOCAL_CREDS credentials     passing, and document where each credential-passing     scheme is used (fdo#60340, Simon McVittie)

  - Make autogen.sh work on *BSD by not assuming GNU     coreutils functionality fdo#35881, fdo#69787; Chengwei     Yang)

  - dbus-monitor: be portable to NetBSD (fdo#69842, Chengwei     Yang)

  - dbus-launch: stop using non-portable asprintf     (fdo#37849, Simon)

  - Improve error reporting from the setuid activation     helper (fdo#66728, Chengwei Yang)

  - Remove unavailable command-line options from     'dbus-daemon --help' (fdo#42441, Ralf Habacker)

  - Add support for looking up local TCPv4 clients'     credentials on Windows XP via the undocumented     AllocateAndGetTcpExTableFromStack function (fdo#66060,     Ralf Habacker)

  - Fix insufficient dependency-tracking (fdo#68505, Simon     McVittie)

  - Don't include wspiapi.h, fixing a compiler warning     (fdo#68852, Simon McVittie)

  - add DBUS_ENABLE_ASSERT, DBUS_ENABLE_CHECKS for less     confusing conditionals (fdo#66142, Chengwei Yang)

  - improve verbose-mode output (fdo#63047, Colin Walters)

  - consolidate Autotools and CMake build (fdo#64875, Ralf     Habacker)

  - fix various unused variables, unusual build     configurations etc. (fdo#65712, fdo#65990, fdo#66005,     fdo#66257, fdo#69165, fdo#69410, fdo#70218; Chengwei     Yang, Vasiliy Balyasnyy)

  - dbus-cve-2014-3533.patch: Add patch for CVE-2014-3533 to     fix (fdo#63127) &bull; CVE-2012-3524: Don't access     environment variables (fdo#52202) (fdo#51521, Dave     Reisner) &bull; Remove an incorrect assertion from     DBusTransport (fdo#51657, (fdo#51406, Simon McVittie)     (fdo#51032, Simon McVittie) (fdo#34671, Simon McVittie)     &middot; Check for libpthread under CMake on Unix     (fdo#47237, Simon McVittie) spec-compliance (fdo#48580,     David Zeuthen) non-root when using OpenBSD install(1)     (fdo#48217, Antoine Jacoutot) (fdo#45896, Simon     McVittie) (fdo#39549, Simon McVittie) invent their own     'union of everything' type (fdo#11191, Simon find(1)     (fdo#33840, Simon McVittie) (fdo#46273, Alban Crequy)     again on Win32, but not on WinCE (fdo#46049, Simon     (fdo#47321, Andoni Morales Alastruey) (fdo#39231,     fdo#41012; Simon McVittie)

  - Add a regression test for fdo#38005 (fdo#39836, Simon     McVittie) a service file entry for activation     (fdo#39230, Simon McVittie) (fdo#24317, #34870; Will     Thompson, David Zeuthen, Simon McVittie) and document it     better (fdo#31818, Will Thompson) &bull; Let the bus     daemon implement more than one interface (fdo#33757,     &bull; Optimize _dbus_string_replace_len to reduce waste     (fdo#21261, (fdo#35114, Simon McVittie) &bull; Add     dbus_type_is_valid as public API (fdo#20496, Simon     McVittie) to unknown interfaces in the bus daemon     (fdo#34527, Lennart Poettering) (fdo#32245; Javier     Jard&oacute;n, Simon McVittie) &bull; Correctly give     XDG_DATA_HOME priority over XDG_DATA_DIRS (fdo#34496, in     embedded environments (fdo#19997, NB#219964; Simon     McVittie) &bull; Install the documentation, and an index     for Devhelp (fdo#13495, booleans when sending them     (fdo#16338, NB#223152; Simon McVittie) errors to     dbus-shared.h (fdo#34527, Lennart Poettering) data     (fdo#10887, Simon McVittie) .service files (fdo#19159,     Sven Herzberg) (fdo#35750, Colin Walters) (fdo#32805,     Mark Brand) which could result in a busy-loop     (fdo#32992, NB#200248; possibly &bull; Fix failure to     detect abstract socket support (fdo#29895) (fdo#32262,     NB#180486) &bull; Improve some error code paths     (fdo#29981, fdo#32264, fdo#32262, fdo#33128, fdo#33277,     fdo#33126, NB#180486) &bull; Avoid possible symlink     attacks in /tmp during compilation (fdo#32854) &bull;
    Tidy up dead code (fdo#25306, fdo#33128, fdo#34292,     NB#180486) &bull; Improve gcc malloc annotations     (fdo#32710) &bull; Documentation improvements     (fdo#11190) &bull; Avoid readdir_r, which is difficult     to use correctly (fdo#8284, fdo#15922, LP#241619) &bull;
    Cope with invalid files in session.d, system.d     (fdo#19186, &bull; Don't distribute generated files that     embed our builddir (fdo#30285, fdo#34292) (fdo#33474,     LP#381063) with lcov HTML reports and
    --enable-compiler-coverage (fdo#10887) &middot; support     credentials-passing (fdo#32542) &middot; opt-in to     thread safety (fdo#33464)

Alban Crequy and Simon McVittie discovered several vulnerabilities in the D-Bus message daemon.

  - CVE-2014-3635     On 64-bit platforms, file descriptor passing could be     abused by local users to cause heap corruption in     dbus-daemon, leading to a crash, or potentially to     arbitrary code execution.

  - CVE-2014-3636     A denial-of-service vulnerability in dbus-daemon allowed     local attackers to prevent new connections to     dbus-daemon, or disconnect existing clients, by     exhausting descriptor limits.

  - CVE-2014-3637     Malicious local users could create D-Bus connections to     dbus-daemon which could not be terminated by killing the     participating processes, resulting in a     denial-of-service vulnerability.

  - CVE-2014-3638     dbus-daemon suffered from a denial-of-service     vulnerability in the code which tracks which messages     expect a reply, allowing local attackers to reduce the     performance of dbus-daemon.

  - CVE-2014-3639     dbus-daemon did not properly reject malicious     connections from local users, resulting in a     denial-of-service vulnerability.

Simon McVittie reports :

Do not accept an extra fd in the padding of a cmsg message, which could lead to a 4-byte heap buffer overrun (CVE-2014-3635).

Reduce default for maximum Unix file descriptors passed per message from 1024 to 16, preventing a uid with the default maximum number of connections from exhausting the system bus' file descriptors under Linux's default rlimit (CVE-2014-3636).

Disconnect connections that still have a fd pending unmarshalling after a new configurable limit, pending_fd_timeout (defaulting to 150 seconds), removing the possibility of creating an abusive connection that cannot be disconnected by setting up a circular reference to a connection's file descriptor (CVE-2014-3637).

Reduce default for maximum pending replies per connection from 8192 to 128, mitigating an algorithmic complexity denial-of-service attack (CVE-2014-3638).

Reduce default for authentication timeout on the system bus from 30 seconds to 5 seconds, avoiding denial of service by using up all unauthenticated connection slots; and when all unauthenticated connection slots are used up, make new connection attempts block instead of disconnecting them (CVE-2014-3639).

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2352-1 advisory.

    Simon McVittie discovered that DBus incorrectly handled the file descriptors message limit. A local     attacker could use this issue to cause DBus to crash, resulting in a denial of service, or possibly     execute arbitrary code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3635)

    Alban Crequy discovered that DBus incorrectly handled a large number of file descriptor messages. A local     attacker could use this issue to cause DBus to stop responding, resulting in a denial of service. This     issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3636)

    Alban Crequy discovered that DBus incorrectly handled certain file descriptor messages. A local attacker     could use this issue to cause DBus to maintain persistent connections, possibly resulting in a denial of     service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3637)

    Alban Crequy discovered that DBus incorrectly handled a large number of parallel connections and parallel     message calls. A local attacker could use this issue to cause DBus to consume resources, possibly     resulting in a denial of service. (CVE-2014-3638)

    Alban Crequy discovered that DBus incorrectly handled incomplete connections. A local attacker could use     this issue to cause DBus to fail legitimate connection attempts, resulting in a denial of service.
    (CVE-2014-3639)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 6.02, has dbus packages installed that are affected by multiple vulnerabilities:

  - Unspecified vulnerability in the match_rule_equal function in bus/signals.c in D-Bus before 1.0.2 allows     local applications to remove match rules for other applications and cause a denial of service (lost     process messages). (CVE-2006-6107)

  - dbus-daemon in D-Bus before 1.0.3, and 1.1.x before 1.1.20, recognizes send_interface attributes in allow     directives in the security policy only for fully qualified method calls, which allows local users to     bypass intended access restrictions via a method call with a NULL interface. (CVE-2008-0595)

  - The _dbus_validate_signature_with_reason function (dbus-marshal-validate.c) in D-Bus (aka DBus) before     1.2.14 uses incorrect logic to validate a basic type, which allows remote attackers to spoof a signature     via a crafted key. NOTE: this is due to an incorrect fix for CVE-2008-3834. (CVE-2009-1189)

  - libdbus 1.5.x and earlier, when used in setuid or other privileged programs in X.org and possibly other     products, allows local users to gain privileges and execute arbitrary code via the DBUS_SYSTEM_BUS_ADDRESS     environment variable. NOTE: libdbus maintainers state that this is a vulnerability in the applications     that do not cleanse environment variables, not in libdbus itself: we do not support use of libdbus in     setuid binaries that do not sanitize their environment before their first call into libdbus.
    (CVE-2012-3524)

  - The _dbus_printf_string_upper_bound function in dbus/dbus-sysdeps-unix.c in D-Bus (aka DBus) 1.4.x before     1.4.26, 1.6.x before 1.6.12, and 1.7.x before 1.7.4 allows local users to cause a denial of service     (service crash) via a crafted message. (CVE-2013-2168)

  - The dbus-daemon in D-Bus 1.2.x through 1.4.x, 1.6.x before 1.6.20, and 1.8.x before 1.8.4, sends an     AccessDenied error to the service instead of a client when the client is prohibited from accessing the     service, which allows local users to cause a denial of service (initialization failure and exit) or     possibly conduct a side-channel attack via a D-Bus message to an inactive service. (CVE-2014-3477)

  - dbus 1.3.0 before 1.6.22 and 1.8.x before 1.8.6 allows local users to cause a denial of service     (disconnect) via a certain sequence of crafted messages that cause the dbus-daemon to forward a message     containing an invalid file descriptor. (CVE-2014-3533)

  - Off-by-one error in D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8, when running on a     64-bit system and the max_message_unix_fds limit is set to an odd number, allows local users to cause a     denial of service (dbus-daemon crash) or possibly execute arbitrary code by sending one more file     descriptor than the limit, which triggers a heap-based buffer overflow or an assertion failure.
    (CVE-2014-3635)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8 allows local users to (1) cause a denial of     service (prevention of new connections and connection drop) by queuing the maximum number of file     descriptors or (2) cause a denial of service (disconnect) via multiple messages that combine to have more     than the allowed number of file descriptors for a single sendmsg call. (CVE-2014-3636)

  - D-Bus 1.3.0 through 1.6.x before 1.6.24 and 1.8.x before 1.8.8 does not properly close connections for     processes that have terminated, which allows local users to cause a denial of service via a D-bus message     containing a D-Bus connection file descriptor. (CVE-2014-3637)

  - The bus_connections_check_reply function in config-parser.c in D-Bus before 1.6.24 and 1.8.x before 1.8.8     allows local users to cause a denial of service (CPU consumption) via a large number of method calls.
    (CVE-2014-3638)

  - The dbus-daemon in D-Bus before 1.6.24 and 1.8.x before 1.8.8 does not properly close old connections,     which allows local users to cause a denial of service (incomplete connection consumption and prevention of     new connections) via a large number of incomplete connections. (CVE-2014-3639)

  - D-Bus 1.3.0 through 1.6.x before 1.6.26, 1.8.x before 1.8.10, and 1.9.x before 1.9.2 allows local users to     cause a denial of service (prevention of new connections and connection drop) by queuing the maximum     number of file descriptors. NOTE: this vulnerability exists because of an incomplete fix for     CVE-2014-3636.1. (CVE-2014-7824)

  - D-Bus 1.4.x through 1.6.x before 1.6.30, 1.8.x before 1.8.16, and 1.9.x before 1.9.10 does not validate     the source of ActivationFailure signals, which allows local users to cause a denial of service (activation     failure error returned) by leveraging a race condition involving sending an ActivationFailure signal     before systemd responds. (CVE-2015-0245)

  - An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-     daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local     attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use     this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus     clients. (CVE-2020-12049)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
77733	FreeBSD：dbus -- 複数の脆弱性（38242d51-3e58-11e4-ac2f-bcaec565249c）	Nessus	FreeBSD Local Security Checks	2014/9/18	2021/1/6	medium
77809	Ubuntu 14.04 LTS : DBus の脆弱性 (USN-2352-1)	Nessus	Ubuntu Local Security Checks	2014/9/23	2024/8/27	medium
80130	Fedora 19 : dbus-1.6.28-1.fc19 (2014-16227)	Nessus	Fedora Local Security Checks	2014/12/22	2021/1/11	medium
79322	Mandriva Linux Security Advisory : dbus (MDVSA-2014:214)	Nessus	Mandriva Local Security Checks	2014/11/19	2021/1/6	medium
79924	Fedora 20 : dbus-1.6.28-1.fc20 (2014-16243)	Nessus	Fedora Local Security Checks	2014/12/15	2021/1/11	medium
99800	EulerOS 2.0 SP1 : dbus (EulerOS-SA-2016-1037)	Nessus	Huawei Local Security Checks	2017/5/1	2021/1/6	medium
77845	openSUSE Security Update : dbus-1 (openSUSE-SU-2014:1228-1)	Nessus	SuSE Local Security Checks	2014/9/25	2021/1/19	medium
77716	Debian DSA-3026-1 : dbus - security update	Nessus	Debian Local Security Checks	2014/9/17	2021/1/11	medium
77733	FreeBSD : dbus -- multiple vulnerabilities (38242d51-3e58-11e4-ac2f-bcaec565249c)	Nessus	FreeBSD Local Security Checks	2014/9/18	2021/1/6	medium
77809	Ubuntu 14.04 LTS : DBus vulnerabilities (USN-2352-1)	Nessus	Ubuntu Local Security Checks	2014/9/23	2024/8/27	medium
80130	Fedora 19 : dbus-1.6.28-1.fc19 (2014-16227)	Nessus	Fedora Local Security Checks	2014/12/22	2021/1/11	medium
167488	NewStart CGSL MAIN 6.02 : dbus Multiple Vulnerabilities (NS-SA-2022-0093)	Nessus	NewStart CGSL Local Security Checks	2022/11/15	2022/11/16	medium

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