RHEL 5 : krb5 (RHSA-2011:0199)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated krb5 packages that fix two security issues are now available
for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other using symmetric encryption and a
trusted third-party, the Key Distribution Center (KDC).

A NULL pointer dereference flaw was found in the way the MIT Kerberos
KDC processed principal names that were not null terminated, when the
KDC was configured to use an LDAP back end. A remote attacker could
use this flaw to crash the KDC via a specially crafted request.
(CVE-2011-0282)

A denial of service flaw was found in the way the MIT Kerberos KDC
processed certain principal names when the KDC was configured to use
an LDAP back end. A remote attacker could use this flaw to cause the
KDC to hang via a specially crafted request. (CVE-2011-0281)

Red Hat would like to thank the MIT Kerberos Team for reporting these
issues. Upstream acknowledges Kevin Longfellow of Oracle Corporation
as the original reporter of the CVE-2011-0281 issue.

All krb5 users should upgrade to these updated packages, which contain
a backported patch to correct these issues. After installing the
updated packages, the krb5kdc daemon will be restarted automatically.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-0281.html
https://www.redhat.com/security/data/cve/CVE-2011-0282.html
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt
http://rhn.redhat.com/errata/RHSA-2011-0199.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 51917 ()

Bugtraq ID: 46265
46271

CVE ID: CVE-2010-4022
CVE-2011-0281
CVE-2011-0282
CVE-2011-0283