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Test ID:1.3.6.1.4.1.25623.1.0.51112
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2004:236
Summary:NOSUMMARY
Description:Description:

The remote host is missing updates announced in
advisory RHSA-2004:236.

Kerberos is a network authentication system.

Bugs have been fixed in the krb5_aname_to_localname library function.
Specifically, buffer overflows were possible for all Kerberos versions up
to and including 1.3.3. The krb5_aname_to_localname function translates a
Kerberos principal name to a local account name, typically a UNIX username.
This function is frequently used when performing authorization checks.

If configured with mappings from particular Kerberos principals to
particular UNIX user names, certain functions called by
krb5_aname_to_localname will not properly check the lengths of buffers
used to store portions of the principal name. If configured to map
principals to user names using rules, krb5_aname_to_localname would
consistently write one byte past the end of a buffer allocated from the
heap. The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CVE-2004-0523 to this issue.

Only configurations which enable the explicit mapping or rules-based
mapping functionality of krb5_aname_to_localname() are vulnerable.
These configurations are not the default.

Users of Kerberos are advised to upgrade to these erratum packages which
contain backported security patches to correct these issues.

Solution:
Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

http://rhn.redhat.com/errata/RHSA-2004-236.html
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt

Risk factor : Critical

CVSS Score:
10.0

Cross-Ref: BugTraq ID: 10448
Common Vulnerability Exposure (CVE) ID: CVE-2004-0523
http://www.securityfocus.com/bid/10448
Bugtraq: 20040601 MITKRB5-SA-2004-001: buffer overflows in krb5_aname_to_localname (Google Search)
http://marc.info/?l=bugtraq&m=108612325909496&w=2
Bugtraq: 20040602 TSSA-2004-009 - kerberos5 (Google Search)
http://marc.info/?l=bugtraq&m=108619161815320&w=2
CERT/CC vulnerability note: VU#686862
http://www.kb.cert.org/vuls/id/686862
Conectiva Linux advisory: CLA-2004:860
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000860
Debian Security Information: DSA-520 (Google Search)
http://www.debian.org/security/2004/dsa-520
http://lwn.net/Articles/88206/
http://www.gentoo.org/security/en/glsa/glsa-200406-21.xml
http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:056
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10295
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2002
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A724
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A991
http://www.redhat.com/support/errata/RHSA-2004-236.html
SGI Security Advisory: 20040604-01-U
ftp://patches.sgi.com/support/free/security/advisories/20040604-01-U.asc
SGI Security Advisory: 20040605-01-U
ftp://patches.sgi.com/support/free/security/advisories/20040605-01-U.asc
http://sunsolve.sun.com/search/document.do?assetkey=1-26-101512-1
http://marc.info/?l=bugtraq&m=108619250923790&w=2
XForce ISS Database: Kerberos-krb5anametolocalname-bo(16268)
https://exchange.xforce.ibmcloud.com/vulnerabilities/16268
CopyrightCopyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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