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Home >> Browse Vulnerability Assessment Database >> Red Hat Local Security Checks >> RHSA-2004-236: krb

Vulnerability Assessment Details

RHSA-2004-236: krb

Vulnerability Assessment Summary
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 ( 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 :
Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security

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