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Test ID:1.3.6.1.4.1.25623.1.0.870701
Category:Red Hat Local Security Checks
Title:RedHat Update for krb5 RHSA-2011:1790-01
Summary:The remote host is missing an update for the 'krb5'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'krb5'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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 certain TGS (Ticket-granting Server) requests. A remote,
authenticated attacker could use this flaw to crash the KDC via a
specially-crafted TGS request. (CVE-2011-1530)

Red Hat would like to thank the MIT Kerberos project for reporting this
issue.

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

Affected Software/OS:
krb5 on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
6.8

CVSS Vector:
AV:N/AC:L/Au:S/C:N/I:N/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-1530
BugTraq ID: 50929
http://www.securityfocus.com/bid/50929
Bugtraq: 20111206 MITKRB5-SA-2011-007 KDC null pointer dereference in TGS handling [CVE-2011-1530] (Google Search)
http://www.securityfocus.com/archive/1/520756/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDVSA-2011:184
http://www.redhat.com/support/errata/RHSA-2011-1790.html
http://securitytracker.com/id?1026374
http://secunia.com/advisories/47124
XForce ISS Database: kerberos-processtgsreq-dos(71655)
https://exchange.xforce.ibmcloud.com/vulnerabilities/71655
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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