Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.

A flaw was found in the way the MIT Kerberos Authentication Service and Key Distribution Center server (krb5kdc) handled Kerberos v4 protocol packets. An unauthenticated remote attacker could use this flaw to crash the krb5kdc daemon, disclose portions of its memory, or possibly execute arbitrary code using malformed or truncated Kerberos v4 protocol requests. (CVE-2008-0062, CVE-2008-0063)

This issue only affected krb5kdc with Kerberos v4 protocol compatibility enabled, which is the default setting on Red Hat Enterprise Linux 4. Kerberos v4 protocol support can be disabled by adding 'v4_mode=none' (without the quotes) to the '[kdcdefaults]' section of /var/kerberos/krb5kdc/kdc.conf.

A flaw was found in the RPC library used by the MIT Kerberos kadmind server. An unauthenticated remote attacker could use this flaw to crash kadmind. This issue only affected systems with certain resource limits configured and did not affect systems using default resource limits used by Red Hat Enterprise Linux 2.1 or 3. (CVE-2008-0948)

Red Hat would like to thank MIT for reporting these issues.

All krb5 users are advised to update to these erratum packages which contain backported fixes to correct these issues.

Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.

A flaw was found in the way the MIT Kerberos Authentication Service and Key Distribution Center server (krb5kdc) handled Kerberos v4 protocol packets. An unauthenticated remote attacker could use this flaw to crash the krb5kdc daemon, disclose portions of its memory, or possibly execute arbitrary code using malformed or truncated Kerberos v4 protocol requests. (CVE-2008-0062, CVE-2008-0063)

This issue only affected krb5kdc with Kerberos v4 protocol compatibility enabled, which is the default setting on Red Hat Enterprise Linux 4. Kerberos v4 protocol support can be disabled by adding 'v4_mode=none' (without the quotes) to the '[kdcdefaults]' section of /var/kerberos/krb5kdc/kdc.conf.

Red Hat would like to thank MIT for reporting these issues.

A double-free flaw was discovered in the GSSAPI library used by MIT Kerberos. This flaw could possibly cause a crash of the application using the GSSAPI library. (CVE-2007-5971)

All krb5 users are advised to update to these erratum packages which contain backported fixes to correct these issues.

This update fixes the following security bugs in krb5/krb5-server :

  - null/dangling pointer (needs enabled krb4 support).
    (CVE-2008-0062)

  - possible operations on uninitialized buffer     content/information leak (needs enabled krb4 support).
    (CVE-2008-0063)

  - out-of-bound array access in kadmind's RPC lib.
    (CVE-2008-0947 / CVE-2008-0948)

Several remote vulnerabilities have been discovered in the kdc component of the krb5, a system for authenticating users and services on a network. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2008-0062     An unauthenticated remote attacker may cause a     krb4-enabled KDC to crash, expose information, or     execute arbitrary code. Successful exploitation of this     vulnerability could compromise the Kerberos key database     and host security on the KDC host.

  - CVE-2008-0063     An unauthenticated remote attacker may cause a     krb4-enabled KDC to expose information. It is     theoretically possible for the exposed information to     include secret key data on some platforms.

  - CVE-2008-0947     An unauthenticated remote attacker can cause memory     corruption in the kadmind process, which is likely to     cause kadmind to crash, resulting in a denial of     service. It is at least theoretically possible for such     corruption to result in database corruption or arbitrary     code execution, though we have no such exploit and are     not aware of any such exploits in use in the wild. In     versions of MIT Kerberos shipped by Debian, this bug can     only be triggered in configurations that allow large     numbers of open file descriptors in a process.

This update incorporates fixes included in MITKRB5-SA-2008-001 (use of uninitialized pointer / double-free in the KDC when v4 compatibility is enabled) and MITKRB5-SA-2008-002 (incorrect handling of high-numbered descriptors in the RPC library). This update also incorporates less-critical fixes for a double- free (CVE-2007-5971) and an incorrect attempt to free non-heap memory (CVE-2007-5901) in the GSSAPI library.

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.

It was discovered that krb5 did not correctly handle certain krb4 requests. An unauthenticated remote attacker could exploit this flaw by sending a specially crafted traffic, which could expose sensitive information, cause a crash, or execute arbitrary code. (CVE-2008-0062, CVE-2008-0063)

A flaw was discovered in the kadmind service's handling of file descriptors. An unauthenticated remote attacker could send specially crafted requests that would cause a crash, resulting in a denial of service. Only systems with configurations allowing large numbers of open file descriptors were vulnerable. (CVE-2008-0947).

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

This update incorporates fixes included in MITKRB5-SA-2008-001 (use of uninitialized pointer / double-free in the KDC when v4 compatibility is enabled) and MITKRB5-SA-2008-002 (incorrect handling of high-numbered descriptors in the RPC library). This update also incorporates less-critical fixes for a double- free (CVE-2007-5971) and an incorrect attempt to free non-heap memory (CVE-2007-5901) in the GSSAPI library. This update also fixes an incorrect calculation of the length of the absolute path name of a file when the relative path is known and the library needs to look up which SELinux label to apply to the file.

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.

A memory management flaw was found in the GSSAPI library used by Kerberos that could result in an attempt to free already freed memory, possibly leading to a crash or allowing the execution of arbitrary code (CVE-2007-5971).

A flaw was discovered in how the Kerberos krb5kdc handled Kerberos v4 protocol packets. An unauthenticated remote attacker could use this flaw to crash the krb5kdc daemon, disclose portions of its memory, or possibly %execute arbitrary code using malformed or truncated Kerberos v4 protocol requests (CVE-2008-0062, CVE-2008-0063).

This issue only affects krb5kdc when it has Kerberos v4 protocol compatibility enabled, which is a compiled-in default in all Kerberos versions that Mandriva Linux ships prior to Mandriva Linux 2008.0.
Kerberos v4 protocol support can be disabled by adding v4_mode=none (without quotes) to the [kdcdefaults] section of /etc/kerberos/krb5kdc/kdc.conf.

A flaw in the RPC library as used in Kerberos' kadmind was discovered by Jeff Altman of Secure Endpoints. An unauthenticated remote attacker could use this vulnerability to crash kadmind or possibly execute arbitrary code in systems with certain resource limits configured;
this does not affect the default resource limits used by Mandriva Linux (CVE-2008-0947).

The updated packages have been patched to correct these issues.

The remote MiracleLinux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2008-153:02 advisory.

    Kerberos V5 is a trusted-third-party network authentication system, which can improve your network's     security by eliminating the insecure practice of cleartext passwords.
    - add preliminary patch to fix use of uninitialized pointer / double-free in KDC     (CVE-2008-0062,CVE-2008-0063)
    - add backported patch to fix use-after-free in libgssapi_krb5 (CVE-2007-5901)
    - add backported patch to fix double-free in libgssapi_krb5 (CVE-2007-5971)
    - add preliminary patch to fix incorrect handling of high-numbered descriptors in the RPC library     (CVE-2008-0947)
    - fix storage of delegated krb5 credentials when they've been wrapped up in spnego
    - return a delegated credential handle even if the application didn't pass a location to store the flags     which would be used to indicate that credentials were delegated
    - add patch to fall back to TCP kpasswd servers for kdc-unreachable, can't-resolve-server, and response-     too-big errors
    - use the right sequence numbers when generating password-set/change requests for kpasswd servers after     the first one
    - backport from 1.6.3 to initialize a library-allocated get_init_creds_opt structure the same way we would     one which was allocated by the calling application, to restore kinit's traditional behavior of doing a     password change right when it detects an expired password
    - ftpd: also do PAM session and credential management when ftp clients use strong authentication
    - update to revised patch for CVE-2007-3999
    - fix omission of files created by the db2 plugin when labeling
    - make krb5-workstation depend on the PAM configuration file used by login.krb5
    - fix omission of kadmin log file when labeling
    - add preliminary patch to fix buffer overflow in rpcsec_gss implementation in libgssrpc (CVE-2007-3999)     and write through uninitialized pointer in kadmind (CVE-2007-4000)
    - kdc: default to listening for TCP clients as well
    - login: change to the user's home directory after dropping privileges, not before
    - turn off the ldap features
    - add a patch to allow applications to try to use a key with kvno=0, if found, in place of the right     version for a request
    - incorporate fixes for MITKRB5-SA-2007-004 (CVE-2007-2442,CVE-2007-2443) and MITKRB5-SA-2007-005     (CVE-2007-2798)
    - reintroduce missing %postun for the non-split_workstation case
    - add missing pam-devel build requirement, force selinux-or-fail build
    - label all files at creation-time according to the SELinux policy
    - perform PAM account / session management in krshd
    - perform PAM authentication and account / session management in ftpd
    - perform PAM authentication, account / session management, and password- changing in login.krb5
    - preprocess kerberos.ldif into a format FDS will like better, and include that as a doc file as well
    - switch man pages to being generated with the right paths in them
    - drop old, incomplete SELinux patch
    - add patch from Greg Hudson to make srvtab routines report missing-file errors at same point that keytab     routines do
    - pull patch from svn to undo unintentional chattiness in ftp
    - pull patch from svn to handle NULL krb5_get_init_creds_opt structures better in a couple of places where     they're expected
    - update to 1.6.1
    - drop no-longer-needed patches for CVE-2007-0956,CVE-2007-0957,CVE-2007-1216
    - drop patch for sendto bug in 1.6, fixed in 1.6.1
    - kadmind.init: don't fail outright if the default principal database isn't there if it looks like we     might be using the kldap plugin
    - kadmind.init: attempt to extract the key for the host-specific kadmin service when we try to create the     keytab
    - omit dependent libraries from the krb5-config --libs output, as using shared libraries (no more static     libraries) makes them unnecessary and they're not part of the libkrb5 interface (strips out libkeyutils,     libresolv, libdl)
    - pull in keyutils as a build requirement to get the KEYRING: ccache type, because we've merged
    - fix an uninitialized length value which could cause a crash when parsing key data coming from a     directory server
    - correct a typo in the krb5.conf man page (ldap_server->ldap_servers)
    - move the default acl_file, dict_file, and admin_keytab settings to the part of the default/example     kdc.conf where they'll actually have an effect
    - add patch to correct unauthorized access via krb5-aware telnetdaemon (CVE-2007-0956)
    - add patch to fix buffer overflow in krb5kdc and kadmind(CVE-2007-0957)
    - add patch to fix double-free in kadmind (CVE-2007-1216)
    - back out buildrequires: keyutils-libs-devel for now
    - add buildrequires: on keyutils-libs-devel to enab

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Rocky Linux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0439 advisory.

    This advisory aggregates security fixes for the krb5 SRPM in CIQ LTS 9.2. It addresses 74 CVEs:
    CVE-2008-0947, CVE-2016-3120, CVE-2012-1014, CVE-2017-15088, CVE-2014-9422, and 69 more.

Tenable has extracted the preceding description block directly from the CIQ 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
31609	CentOS 3 : krb5 (CESA-2008:0181)	Nessus	CentOS Local Security Checks	2008/3/19	2021/1/4	critical
31617	RHEL 4 : krb5 (RHSA-2008:0180)	Nessus	Red Hat Local Security Checks	2008/3/19	2021/1/14	high
31624	SuSE 10 Security Update : Kerberos 5 (ZYPP Patch Number 5082)	Nessus	SuSE Local Security Checks	2008/3/19	2021/1/14	critical
31630	Debian DSA-1524-1 : krb5 - several vulnerabilities	Nessus	Debian Local Security Checks	2008/3/21	2021/1/4	critical
31668	Fedora 7 : krb5-1.6.1-9.fc7 (2008-2637)	Nessus	Fedora Local Security Checks	2008/3/26	2021/1/11	critical
31625	Ubuntu 6.06 LTS / 6.10 / 7.04 / 7.10 : krb5 vulnerabilities (USN-587-1)	Nessus	Ubuntu Local Security Checks	2008/3/19	2021/1/19	critical
31670	Fedora 8 : krb5-1.6.2-14.fc8 (2008-2647)	Nessus	Fedora Local Security Checks	2008/3/26	2021/1/11	critical
37527	Mandriva Linux Security Advisory : krb5 (MDVSA-2008:070)	Nessus	Mandriva Local Security Checks	2009/4/23	2021/1/6	critical
284120	MiracleLinux 3 : krb5-1.6.1-17AXS3.1 (AXSA:2008-153:02)	Nessus	Miracle Linux Local Security Checks	2026/1/14	2026/1/14	critical
355341	Rocky Linux 9.2 [CIQ] Security Update: krb5-devel / krb5-libs / krb5-libs-debuginfo / krb5-pkinit / etc Multiple Vulnerabilities (ciqsa-2026_0439)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/13	critical

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