From Red Hat Security Advisory 2010:0926 :

Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party, the Key Distribution Center (KDC).

Multiple checksum validation flaws were discovered in the MIT Kerberos implementation. A remote attacker could use these flaws to tamper with certain Kerberos protocol packets and, possibly, bypass authentication mechanisms in certain configurations using Single-use Authentication Mechanisms. (CVE-2010-1323)

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

All krb5 users should upgrade to these updated packages, which contain a backported patch to correct these issues. After installing the updated packages, the krb5kdc daemon will be restarted automatically.

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)

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.

Multiple remote vulnerabilities in the MIT krb5 package have been fixed. They affect client as well as server software. CVE-2010-1323, CVE-2010-1324,CVE-2010-4020 and CVE-2010-4021 have been assigned to this issue.

This update incorporates the upstream patches to correct bugs outlined in MITKRB5-SA-2010-007 (CVE-2010-1323, CVE-2010-1324, and CVE-2010-4020).

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.

Versions of Mac OS X 10.6 earlier than 10.6.7 are potentially affected by a security issue.  Mac OS X 10.6.7 contains a security fix for the following products :

  - Airport

  - Apache

  - AppleScript

  - ATS

  - bzip2

  - CarbonCore

  - ClamAV

  - CoreText

  - HFS

  - ImageIO

  - Image RAW

  - Installer

  - Kerberos

  - Kernel

  - Libinfo

  - libxml

  - Mailman

  - PHP

  - QuickLook

  - QuickTime

  - Ruby

  - Samba

  - Subversion

  - Terminal

  - X11

Versions of Mac OS X 10.6 earlier than 10.6.7 are potentially affected by a security issue.  Mac OS X 10.6.7 contains a security fix for the following products :

  - Airport

  - Apache

  - AppleScript

  - ATS

  - bzip2

  - CarbonCore

  - ClamAV

  - CoreText

  - HFS

  - ImageIO

  - Image RAW

  - Installer

  - Kerberos

  - Kernel

  - Libinfo

  - libxml

  - Mailman

  - PHP

  - QuickLook

  - QuickTime

  - Ruby

  - Samba

  - Subversion

  - Terminal

  - X11
IAVB Reference : 2010-B-0083
STIG Finding Severity : Category II

ID	Name	Product	Family	Published	Updated	Severity
68152	Oracle Linux 4 / 5 : krb5 (ELSA-2010-0926)	Nessus	Oracle Linux Local Security Checks	7/12/2013	1/14/2021	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
57655	GLSA-201201-13 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/24/2012	1/6/2021	medium
53672	openSUSE Security Update : krb5 (openSUSE-SU-2010:1053-1)	Nessus	SuSE Local Security Checks	5/5/2011	1/14/2021	medium
53742	openSUSE Security Update : krb5 (openSUSE-SU-2010:1053-1)	Nessus	SuSE Local Security Checks	5/5/2011	1/14/2021	medium
51083	Fedora 14 : krb5-1.8.2-7.fc14 (2010-18409)	Nessus	Fedora Local Security Checks	12/9/2010	1/11/2021	medium
5826	Mac OS X 10.6 < 10.6.7 Multiple Vulnerabilities	Nessus Network Monitor	Generic	3/21/2011	3/6/2019	critical
800796	Mac OS X 10.6 < 10.6.7 Multiple Vulnerabilities	Log Correlation Engine	Operating System Detection	3/21/2011		high

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