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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 krb5 package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory FEDORA-2004-149 (krb5).
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.
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.
Solution : http://www.fedoranews.org/updates/FEDORA-2004-149.shtml
Network Security Threat Level: High
Networks Security ID: 10448
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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