リモートの Ubuntu 16.04 LTS / 18.04 LTS ホストには、USN-4578-1 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。

  - 4.16.3までのLinux カーネルのfs/xfs/libxfs/xfs_inode_buf.cにあるxfs_dinode_verify関数により、ローカルユーザーが細工されたxfs画像を介してサービスの拒否 (xfs_ilock_attr_map_sharedの無効なポインタ参照) を引き起こす可能性があります。(CVE-2018-10322)

  - Linux カーネル 5.0.21および5.3.11では、細工されたbtrfsファイルシステムイメージをマウントし、いくつかの操作を実行してからsyncfsシステムコールを行うと、fs/btrfs/free-space-cache.cのtry_merge_free_spaceでuse-after-freeが発生する可能性があります。これは、左のデータ構造へのポインターと右のデータ構造へのポインターが同じになるためです。(CVE-2019-19448)

  - ext3/ext4ファイルシステムを使用する5.9-rc2より前のLinux カーネルに、破損しているインデックスでディレクトリにアクセスすることによるメモリ領域外読み取りの欠陥が見つかりました。この欠陥により、そのディレクトリが存在する場合、ローカルユーザーがシステムをクラッシュさせる可能性があります。この脆弱性が最大の脅威となるのは、システムの可用性です。
    (CVE-2020-14314)

  - リリース後に dccps_hc_tx_ccid オブジェクトがリスナーとして添付された DCCP ソケットを再利用するため、ローカルの攻撃者が悪用可能な Linux カーネルにメモリ解放後使用 (Use After Free) の脆弱性があります。Ubuntu Linux カーネル5.4.0-51.56、5.3.0-68.63、4.15.0-121.123、4.4.0-193.224、3.13.0.182.191および3.2.0-149.196で修正済み。
    (CVE-2020-16119)

  -Overlayfsは、overlayfsでファイルをコピーする際に、権限チェックを適切に実行せず、権限のないユーザーの名前空間が許可されているなどの場合、ユーザーの名前空間から悪用される可能性があります。権限のないユーザーが読み取り可能ではないファイルを、取り外し可能なデバイスのように、ユーザーがコントロールするマウントポイントにコピーすることが可能でした。これは、カーネルバージョン4.19で次が導入していました。コミットd1d04ef（ovl：
    スタックファイルops）。これはカーネルバージョン 5.8で次により修正されていました。コミット56230d9（ovl：ovl_path_open()で許可を確認する）、48bd024（ovl：readdirでマウンタークレジットに切り替える）および05acefb（ovl：実際のファイルを開く許可をチェックする）。さらに、コミット130fdbc（ovl：実際のディレクトリを開くための正しいフラグを渡す）および292f902（ovl：ovl_real_ioctl()でセキュリティフックを呼び出す）カーネル5.8でのセキュリティフックを呼び出すことも必要となる場合があります。これらの追加のコミットにより、ユーザー名前空間内のオーバーレイマウントで回帰が導入され、ユーザー名前空間外の所有権を持つファイルへのアクセスが阻止されました。この回帰は、その後のコミットb6650da（ovl：O_NOATIMEiのために失敗しない）によって、カーネル5.11で軽減されました。（CVE-2020-16120）

  - 5.8.3 より以前の Linux カーネルにおいて、NFS クライアントコードにある TOCTOU の不一致は、サイズチェックが fs/nfs/nfs4xdr.c ではなく fs/nfs/nfs4proc.c で行われるため、ローカルの攻撃者がメモリを破損させたり、詳細不明なその他の影響を与えたりするために使用されます (別名 CID-b4487b935452)。(CVE-2020-25212)

  - 5.8.2以前のLinux カーネルのnet/nfc/rawsock.cのNFCソケット作成におけるCAP_NET_RAWチェックの欠落は、rawソケットを作成してセキュリティメカニズム (CID-26896f01467a) をバイパスするために、ローカルの攻撃者によって利用される可能性があります。(CVE-2020-26088)

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。

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The IPv6 SCTP implementation in net/sctp/ipv6.c in the     Linux kernel through 3.11.1 uses data structures and     function calls that do not trigger an intended     configuration of IPsec encryption, which allows remote     attackers to obtain sensitive information by sniffing     the network.(CVE-2013-4350i1/4%0

  - The sg_ioctl function in drivers/scsi/sg.c in the Linux     kernel allows local users to cause a denial of service     (stack-based buffer overflow) or possibly have     unspecified other impacts via a large command size in     an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds     write access in the sg_write function.(CVE-2017-7187i1/4%0

  - An issue was discovered in can_can_gw_rcv in     net/can/gw.c in the Linux kernel through 4.19.13. The     CAN frame modification rules allow bitwise logical     operations that can be also applied to the can_dlc     field. Because of a missing check, the CAN drivers may     write arbitrary content beyond the data registers in     the CAN controller's I/O memory when processing can-gw     manipulated outgoing frames. This is related to     cgw_csum_xor_rel. An unprivileged user can trigger a     system crash (general protection     fault).(CVE-2019-3701i1/4%0

  - net/rds/sysctl.c in the Linux kernel before 3.19 uses     an incorrect data type in a sysctl table, which allows     local users to obtain potentially sensitive information     from kernel memory or possibly have unspecified other     impact by accessing a sysctl entry.(CVE-2015-2042i1/4%0

  - The inet_csk_clone_lock function in     net/ipv4/inet_connection_sock.c in the Linux kernel     allows attackers to cause a denial of service (double     free) or possibly have unspecified other impact by     leveraging use of the accept system call. An     unprivileged local user could use this flaw to induce     kernel memory corruption on the system, leading to a     crash. Due to the nature of the flaw, privilege     escalation cannot be fully ruled out, although we     believe it is unlikely.(CVE-2017-8890i1/4%0

  - The overlayfs implementation in the linux (aka Linux     kernel) package before 3.19.0-21.21 in Ubuntu through     15.04 does not properly check permissions for file     creation in the upper filesystem directory, which     allows local users to obtain root access by leveraging     a configuration in which overlayfs is permitted in an     arbitrary mount namespace.(CVE-2015-1328i1/4%0

  - The xfs_dinode_verify function in     fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel     through 4.16.3 allows local users to cause a denial of     service (xfs_ilock_attr_map_shared invalid pointer     dereference) via a crafted xfs image.(CVE-2018-10322i1/4%0

  - In the flush_tmregs_to_thread function in     arch/powerpc/kernel/ptrace.c in the Linux kernel before     4.13.5, a guest kernel crash can be triggered from     unprivileged userspace during a core dump on a POWER     host due to a missing processor feature check and an     erroneous use of transactional memory (TM) instructions     in the core dump path, leading to a denial of     service.(CVE-2018-1091i1/4%0

  - ** DISPUTED ** drivers/scsi/libsas/sas_scsi_host.c in     the Linux kernel before 4.16 allows local users to     cause a denial of service (ata qc leak) by triggering     certain failure conditions. NOTE: a third party     disputes the relevance of this report because the     failure can only occur for physically proximate     attackers who unplug SAS Host Bus Adapter     cables.(CVE-2018-10021i1/4%0

  - A use-after-free flaw was discovered in the Linux     kernel's tty subsystem, which allows for the disclosure     of uncontrolled memory location and possible kernel     panic. The information leak is caused by a race     condition when attempting to set and read the tty line     discipline. A local attacker could use the TIOCSETD     (via tty_set_ldisc ) to switch to a new line discipline     a concurrent call to a TIOCGETD ioctl performing a read     on a given tty could then access previously allocated     memory. Up to 4 bytes could be leaked when querying the     line discipline or the kernel could panic with a     NULL-pointer dereference.(CVE-2016-0723i1/4%0

  - An out-of-bounds read flaw was found in the way the     Logitech Unifying receiver driver handled HID reports     with an invalid device_index value. An attacker with     physical access to the system could use this flaw to     crash the system or, potentially, escalate their     privileges on the system.(CVE-2014-3182i1/4%0

  - arch/x86/kvm/emulate.c in the Linux kernel through     4.9.3 allows local users to obtain sensitive     information from kernel memory or cause a denial of     service (use-after-free) via a crafted application that     leverages instruction emulation for fxrstor, fxsave,     sgdt, and sidt.(CVE-2017-2584i1/4%0

  - A flaw was found in the way the Linux kernel handled     IRET faults during the processing of NMIs. An     unprivileged, local user could use this flaw to crash     the system or, potentially (although highly unlikely),     escalate their privileges on the     system.(CVE-2015-5157i1/4%0

  - drivers/media/media-device.c in the Linux kernel before     3.11, as used in Android before 2016-08-05 on Nexus 5     and 7 (2013) devices, does not properly initialize     certain data structures, which allows local users to     obtain sensitive information via a crafted application,     aka Android internal bug 28750150 and Qualcomm internal     bug CR570757, a different vulnerability than     CVE-2014-1739.(CVE-2014-9895i1/4%0

  - A use-after-free vulnerability in sys_ioprio_get() was     found due to get_task_ioprio() accessing the     task-i1/4zio_context without holding the task lock and     could potentially race with exit_io_context(), leading     to a use-after-free.(CVE-2016-7911i1/4%0

  - A flaw was found in the Linux kernel which is related     to the user namespace lazily unmounting file systems.
    The fs_pin struct has two members (m_list and s_list)     which are usually initialized on use in the     pin_insert_group function. However, these members might     go unmodified in this case, the system panics when it     attempts to destroy or free them. This flaw could be     used to launch a denial-of-service     attack.(CVE-2015-4178i1/4%0

  - A flaw was found in the Linux kernel's implementation     of raw_sendmsg allowing a local attacker to panic the     kernel or possibly leak kernel addresses. A local     attacker, with the privilege of creating raw sockets,     can abuse a possible race condition when setting the     socket option to allow the kernel to automatically     create ip header values and thus potentially escalate     their privileges.(CVE-2017-17712i1/4%0

  - A flaw was discovered in the F2FS filesystem code in     fs/f2fs/super.c in the Linux kernel. A denial of     service, due to an out-of-bounds memory access, can     occur upon encountering an abnormal bitmap size when     mounting a crafted f2fs image.(CVE-2018-13096i1/4%0

  - A NULL pointer dereference flaw was found in the way     the Linux kernel's madvise MADV_WILLNEED functionality     handled page table locking. A local, unprivileged user     could use this flaw to crash the     system.(CVE-2014-8173i1/4%0

  - An out-of-bounds heap memory access leading to a Denial     of Service, heap disclosure, or further impact was     found in setsockopt(). The function call is normally     restricted to root, however some processes with     cap_sys_admin may also be able to trigger this flaw in     privileged container environments.(CVE-2016-4998i1/4%0

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.

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)

* kernel: out-of-bounds access in the show_timer function in kernel/time/ posix-timers.c (CVE-2017-18344)

* kernel: Integer overflow in udl_fb_mmap() can allow attackers to execute code in kernel space (CVE-2018-8781)

* kernel: MIDI driver race condition leads to a double-free (CVE-2018-10902)

* kernel: Missing check in inode_init_owner() does not clear SGID bit on non-directories for non-members (CVE-2018-13405)

* kernel: AIO write triggers integer overflow in some protocols (CVE-2015-8830)

* kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation (CVE-2017-0861)

* kernel: Handling of might_cancel queueing is not properly pretected against race (CVE-2017-10661)

* kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial of service (CVE-2017-17805)

* kernel: Inifinite loop vulnerability in madvise_willneed() function allows local denial of service (CVE-2017-18208)

* kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service (CVE-2018-1120)

* kernel: a NULL pointer dereference in dccp_write_xmit() leads to a system crash (CVE-2018-1130)

* kernel: drivers/block/loop.c mishandles lo_release serialization allowing denial of service (CVE-2018-5344)

* kernel: Missing length check of payload in _sctp_make_chunk() function allows denial of service (CVE-2018-5803)

* kernel: buffer overflow in drivers/net/wireless/ath/wil6210/ wmi.c:wmi_set_ie() may lead to memory corruption (CVE-2018-5848)

* kernel: out-of-bound write in ext4_init_block_bitmap function with a crafted ext4 image (CVE-2018-10878)

* kernel: Improper validation in bnx2x network card driver can allow for denial of service attacks via crafted packet (CVE-2018-1000026)

* kernel: Information leak when handling NM entries containing NUL (CVE-2016-4913)

* kernel: Mishandling mutex within libsas allowing local Denial of Service (CVE-2017-18232)

* kernel: NULL pointer dereference in ext4_process_freed_data() when mounting crafted ext4 image (CVE-2018-1092)

* kernel: NULL pointer dereference in ext4_xattr_inode_hash() causes crash with crafted ext4 image (CVE-2018-1094)

* kernel: vhost: Information disclosure in vhost/vhost.c:vhost_new_msg() (CVE-2018-1118)

* kernel: Denial of service in resv_map_release function in mm/hugetlb.c (CVE-2018-7740)

* kernel: Memory leak in the sas_smp_get_phy_events function in drivers/scsi/ libsas/sas_expander.c (CVE-2018-7757)

* kernel: Invalid pointer dereference in xfs_ilock_attr_map_shared() when mounting crafted xfs image allowing denial of service (CVE-2018-10322)

* kernel: use-after-free detected in ext4_xattr_set_entry with a crafted file (CVE-2018-10879)

* kernel: out-of-bound access in ext4_get_group_info() when mounting and operating a crafted ext4 image (CVE-2018-10881)

* kernel: stack-out-of-bounds write in jbd2_journal_dirty_metadata function (CVE-2018-10883)

* kernel: incorrect memory bounds check in drivers/cdrom/cdrom.c (CVE-2018-10940)

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391; Trend Micro Zero Day Initiative for reporting CVE-2018-10902; Qualys Research Labs for reporting CVE-2018-1120;
Evgenii Shatokhin (Virtuozzo Team) for reporting CVE-2018-1130; and Wen Xu for reporting CVE-2018-1092 and CVE-2018-1094.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4509 advisory.

    - KVM: X86: Fix scan ioapic use-before-initialization (Wanpeng Li)  [Orabug: 29026132]  {CVE-2018-19407}
    - ALSA: usb-audio: Fix UAF decrement if card has no live interfaces in card.c (Hui Peng)  [Orabug:
    29042979]  {CVE-2018-19824}
    - xfs: enhance dinode verifier (Eric Sandeen)  [Orabug: 28997653]  {CVE-2018-10322}
    - xfs: move inode fork verifiers to xfs_dinode_verify (Darrick J. Wong)  [Orabug: 28997653]     {CVE-2018-10322}
    - net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe() (Wei Yongjun)  [Orabug:
    27677743]  {CVE-2018-8043}
    - wil6210: missing length check in wmi_set_ie (Lior David)  [Orabug: 28951264]  {CVE-2018-5848}
    - floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl (Andy Whitcroft)   {CVE-2018-7755}     {CVE-2018-7755}

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

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

An update of the linux package has been released.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2948 advisory.

    The kernel-alt packages provide the Linux kernel version 4.x.

    Security Fix(es):

    * An industry-wide issue was found in the way many modern microprocessor designs have implemented     speculative execution of Load & Store instructions (a commonly used performance optimization). It relies     on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact     that memory read from address to which a recent memory write has occurred may see an older value and     subsequently cause an update into the microprocessor's data cache even for speculatively executed     instructions that never actually commit (retire). As a result, an unprivileged attacker could use this     flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639, aarch64)

    * A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A     remote attacker could use this flaw to trigger time and calculation expensive calls to     tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within     ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system.
    Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open     port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)

    * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4     and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment     reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a     denial of service on the system. (CVE-2018-5391)

    Space precludes documenting all of the security fixes in this advisory. See the descriptions of the     remaining security fixes in the related Knowledge Article:

    https://access.redhat.com/articles/3658021

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project     Zero) for reporting CVE-2018-3639; Juha-Matti Tilli (Aalto University - Department of Communications and     Networking and Nokia Bell Labs) for reporting CVE-2018-5390 and CVE-2018-5391; Qualys Research Labs for     reporting CVE-2018-1120; David Rientjes (Google) for reporting CVE-2018-1000200; and Wen Xu for reporting     CVE-2018-1092, CVE-2018-1094, and CVE-2018-1095. The CVE-2018-14619 issue was discovered by Florian Weimer     (Red Hat) and Ondrej Mosnacek (Red Hat).

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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
141448	Ubuntu 16.04LTS / 18.04LTS: Linux カーネル脆弱性 (USN-4578-1)	Nessus	Ubuntu Local Security Checks	2020/10/14	2024/8/27	high
124972	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1519)	Nessus	Huawei Local Security Checks	2019/5/14	2022/5/20	high
118990	CentOS 7 : kernel (CESA-2018:3083)	Nessus	CentOS Local Security Checks	2018/11/16	2022/5/27	high
121201	Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2019-4509)	Nessus	Oracle Linux Local Security Checks	2019/1/16	2024/11/1	high
121868	Photon OS 1.0: Linux PHSA-2018-1.0-0169	Nessus	PhotonOS Local Security Checks	2019/2/7	2024/6/21	medium
118513	RHEL 7 : kernel-alt (RHSA-2018:2948)	Nessus	Red Hat Local Security Checks	2018/10/31	2025/3/16	high

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