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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the krb packages
Detailed Explanation for this Vulnerability Assessment
Updated Kerberos 5 (krb5) packages which correct buffer overflows in the
krb5_aname_to_localname function are now available.
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 : http://rhn.redhat.com/errata/RHSA-2004-236.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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