This update incorporates the upstream patch to fix an uninitialized pointer crash in the KDC's authorization data handling routines (CVE-2010-1322). It also pulls up a few backports and compilation flag changes from F15.

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 vulnerability was discovered and corrected in krb5 :

The merge_authdata function in kdc_authdata.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8.x before 1.8.4 does not properly manage an index into an authorization-data list, which allows remote attackers to cause a denial of service (daemon crash), or possibly obtain sensitive information, spoof authorization, or execute arbitrary code, via a TGS request, as demonstrated by a request from a Windows Active Directory client (CVE-2010-1322).

The updated packages have been patched to correct this issue.

The remote Solaris system is missing necessary patches to address security updates :

  - The merge_authdata function in kdc_authdata.c in the Key     Distribution Center (KDC) in MIT Kerberos 5 (aka krb5)     1.8.x before 1.8.4 does not properly manage an index     into an authorization-data list, which allows remote     attackers to cause a denial of service (daemon crash),     or possibly obtain sensitive information, spoof     authorization, or execute arbitrary code, via a TGS     request that triggers an uninitialized pointer     dereference, as demonstrated by a request from a Windows     Active Directory client. (CVE-2010-1322)

  - MIT Kerberos 5 (aka krb5) 1.3.x, 1.4.x, 1.5.x, 1.6.x,     1.7.x, and 1.8.x through 1.8.3 does not properly     determine the acceptability of checksums, which might     allow remote attackers to modify user-visible prompt     text, modify a response to a Key Distribution Center     (KDC), or forge a KRB-SAFE message via certain checksums     that (1) are unkeyed or (2) use RC4 keys.
    (CVE-2010-1323)

  - MIT Kerberos 5 (aka krb5) 1.7.x and 1.8.x through 1.8.3     does not properly determine the acceptability of     checksums, which might allow remote attackers to forge     GSS tokens, gain privileges, or have unspecified other     impact via (1) an unkeyed checksum, (2) an unkeyed PAC     checksum, or (3) a KrbFastArmoredReq checksum based on     an RC4 key. (CVE-2010-1324)

  - MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not     reject RC4 key-derivation checksums, which might allow     remote authenticated users to forge a (1) AD-SIGNEDPATH     or (2) AD-KDC-ISSUED signature, and possibly gain     privileges, by leveraging the small key space that     results from certain one-byte stream-cipher operations.
    (CVE-2010-4020)

  - The Key Distribution Center (KDC) in MIT Kerberos 5 (aka     krb5) 1.7 does not properly restrict the use of TGT     credentials for armoring TGS requests, which might allow     remote authenticated users to impersonate a client by     rewriting an inner request, aka a 'KrbFastReq forgery     issue.' (CVE-2010-4021)

  - Double free vulnerability in the prepare_error_as     function in do_as_req.c in the Key Distribution Center     (KDC) in MIT Kerberos 5 (aka krb5) 1.7 through 1.9, when     the PKINIT feature is enabled, allows remote attackers     to cause a denial of service (daemon crash) or possibly     execute arbitrary code via an e_data field containing     typed data. (CVE-2011-0284)

Mike Roszkowski discovered that the Kerberos KDC did not correctly validate the contents of certain messages. If an authenticated remote attacker sent specially crafted TGS requests, the KDC service would crash, leading to a denial of service.

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.

remote authenticated clients could crash the kdc (CVE-2010-1322).

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2010:0863 advisory.

  - krb5: KDC uninitialized pointer crash in authorization data handling (MITKRB5-SA-2010-006) (CVE-2010-1322)

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

An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled TGS (Ticket-granting Server) request messages. A remote, authenticated attacker could use this flaw to crash the KDC or, possibly, disclose KDC memory or execute arbitrary code with the privileges of the KDC (krb5kdc). (CVE-2010-1322)

After installing the updated packages, the krb5kdc daemon will be restarted automatically.

The remote host is affected by the vulnerability described in GLSA-201201-13 (MIT Kerberos 5: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in MIT Kerberos 5. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker may be able to execute arbitrary code with the       privileges of the administration daemon or the Key Distribution Center       (KDC) daemon, cause a Denial of Service condition, or possibly obtain       sensitive information. Furthermore, a remote attacker may be able to       spoof Kerberos authorization, modify KDC responses, forge user data       messages, forge tokens, forge signatures, impersonate a client, modify       user-visible prompt text, or have other unspecified impact.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Published	Updated	Severity
49988	Fedora 14 : krb5-1.8.2-6.fc14 (2010-15803)	Nessus	Fedora Local Security Checks	10/15/2010	1/11/2021	medium
49972	Mandriva Linux Security Advisory : krb5 (MDVSA-2010:202)	Nessus	Mandriva Local Security Checks	10/14/2010	1/6/2021	medium
80653	Oracle Solaris Third-Party Patch Update : kerberos (cve_2010_1322_improper_input)	Nessus	Solaris Local Security Checks	1/19/2015	1/14/2021	medium
49772	Ubuntu 10.04 LTS / 10.10 : krb5 vulnerability (USN-999-1)	Nessus	Ubuntu Local Security Checks	10/6/2010	9/19/2019	medium
75558	openSUSE Security Update : krb5 (openSUSE-SU-2010:0709-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/14/2021	medium
50635	RHEL 6 : krb5 (RHSA-2010:0863)	Nessus	Red Hat Local Security Checks	11/18/2010	4/21/2024	critical
60894	Scientific Linux Security Update : krb5 on SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	8/1/2012	1/14/2021	medium
57655	GLSA-201201-13 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/24/2012	1/6/2021	medium

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