GLSA-200406-21 : mit-krb5: Multiple buffer overflows in krb5_aname_to_localname

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


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200406-21
(mit-krb5: Multiple buffer overflows in krb5_aname_to_localname)

The library function krb5_aname_to_localname() contains multiple buffer
overflows. This is only exploitable if explicit mapping or rules-based
mapping is enabled. These are not enabled as default.
With explicit mapping enabled, an attacker must authenticate using a
principal name listed in the explicit mapping list.
With rules-based mapping enabled, an attacker must first be able to create
arbitrary principal names either in the local realm Kerberos realm or in a
remote realm from which the local realm's service are reachable by
cross-realm authentication.

Impact :

An attacker could use these vulnerabilities to execute arbitrary code with
the permissions of the user running mit-krb5, which could be the root user.

Workaround :

There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version.

See also :

http://www.nessus.org/u?6c54187f
http://www.gentoo.org/security/en/glsa/glsa-200406-21.xml

Solution :

mit-krb5 users should upgrade to the latest version:
# emerge sync
# emerge -pv '>=app-crypt/mit-krb5-1.3.3-r1'
# emerge '>=app-crypt/mit-krb5-1.3.3-r1'

Risk factor :

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

Family: Gentoo Local Security Checks

Nessus Plugin ID: 14532 (gentoo_GLSA-200406-21.nasl)

Bugtraq ID:

CVE ID: CVE-2004-0523