RHEL 2.1 / 3 : krb5 (RHSA-2004:236)

This script is Copyright (C) 2004-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2004-0523.html
http://www.nessus.org/u?6c54187f
http://rhn.redhat.com/errata/RHSA-2004-236.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 12502 ()

Bugtraq ID:

CVE ID: CVE-2004-0523