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Home >> Browse Vulnerability Assessment Database >> Fedora Local Security Checks >> Fedora Core 2 2004-150: krb5

Vulnerability Assessment Details

Fedora Core 2 2004-150: krb5

Vulnerability Assessment Summary
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-2004-150 (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.

Update Information:

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
( 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 :
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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