Executive Summary

Summary
Titlekrb5 security update
Informations
NameRHSA-2011:1790First vendor Publication2011-12-06
VendorRedHatLast vendor Modification2011-12-06
Severity (Vendor) ModerateRevision01

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:N/I:N/A:C)
Cvss Base Score6.8Attack RangeNetwork
Cvss Impact Score6.9Attack ComplexityLow
Cvss Expoit Score8AuthenticationRequires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated krb5 packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

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.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

753748 - CVE-2011-1530 krb5 (krb5kdc): NULL pointer dereference in the TGS handling (MITKRB5-SA-2011-007)

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2011-1790.html

CWE : Common Weakness Enumeration

idName
CWE-399Resource Management Errors

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:22167
 
Oval ID: oval:org.mitre.oval:def:22167
Title: RHSA-2011:1790: krb5 security update (Moderate)
Description: The process_tgs_req function in do_tgs_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.2 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted TGS request that triggers an error other than the KRB5_KDB_NOENTRY error.
Family: unix Class: patch
Reference(s): RHSA-2011:1790-01
CESA-2011:1790
CVE-2011-1530
Version: 4
Platform(s): Red Hat Enterprise Linux 6
CentOS Linux 6
Product(s): krb5
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:23672
 
Oval ID: oval:org.mitre.oval:def:23672
Title: ELSA-2011:1790: krb5 security update (Moderate)
Description: The process_tgs_req function in do_tgs_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.9 through 1.9.2 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted TGS request that triggers an error other than the KRB5_KDB_NOENTRY error.
Family: unix Class: patch
Reference(s): ELSA-2011:1790-01
CVE-2011-1530
Version: 3
Platform(s): Oracle Linux 6
Product(s):
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application3

OpenVAS Exploits

DateDescription
2012-08-14Name : Fedora Update for krb5 FEDORA-2012-11370
File : nvt/gb_fedora_2012_11370_krb5_fc16.nasl
2012-07-30Name : CentOS Update for krb5-devel CESA-2011:1790 centos6
File : nvt/gb_CESA-2011_1790_krb5-devel_centos6.nasl
2012-07-09Name : RedHat Update for krb5 RHSA-2011:1790-01
File : nvt/gb_RHSA-2011_1790-01_krb5.nasl
2012-06-15Name : Fedora Update for krb5 FEDORA-2012-8803
File : nvt/gb_fedora_2012_8803_krb5_fc16.nasl
2012-06-15Name : Fedora Update for krb5 FEDORA-2012-8805
File : nvt/gb_fedora_2012_8805_krb5_fc15.nasl
2012-04-02Name : Fedora Update for krb5 FEDORA-2011-16296
File : nvt/gb_fedora_2011_16296_krb5_fc16.nasl
2012-03-16Name : Ubuntu Update for krb5 USN-1290-1
File : nvt/gb_ubuntu_USN_1290_1.nasl
2012-02-12Name : Gentoo Security Advisory GLSA 201201-13 (mit-krb5)
File : nvt/glsa_201201_13.nasl
2012-02-01Name : Fedora Update for krb5 FEDORA-2011-16284
File : nvt/gb_fedora_2011_16284_krb5_fc15.nasl
0000-00-00Name : FreeBSD Ports: krb5
File : nvt/freebsd_krb514.nasl

Open Source Vulnerability Database (OSVDB)

idDescription
77572MIT Kerberos 5 (krb5) src/kdc/do_tgs_req.c process_tgs_req() Function TGS Req...

Nessus® Vulnerability Scanner

DateDescription
2013-09-04Name : The remote Amazon Linux AMI host is missing a security update.
File : ala_ALAS-2011-28.nasl - Type : ACT_GATHER_INFO
2013-07-12Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2011-1790.nasl - Type : ACT_GATHER_INFO
2012-09-06Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2011-184.nasl - Type : ACT_GATHER_INFO
2012-08-01Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20111206_krb5_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2012-02-01Name : The remote Fedora host is missing a security update.
File : fedora_2011-16284.nasl - Type : ACT_GATHER_INFO
2012-01-24Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201201-13.nasl - Type : ACT_GATHER_INFO
2011-12-23Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2011-1790.nasl - Type : ACT_GATHER_INFO
2011-12-14Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_6c7d9a35260811e189b4001ec9578670.nasl - Type : ACT_GATHER_INFO
2011-12-13Name : The remote Fedora host is missing a security update.
File : fedora_2011-16296.nasl - Type : ACT_GATHER_INFO
2011-12-08Name : The remote Ubuntu host is missing a security-related patch.
File : ubuntu_USN-1290-1.nasl - Type : ACT_GATHER_INFO
2011-12-07Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2011-1790.nasl - Type : ACT_GATHER_INFO

Alert History

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DateInformations
2014-02-17 11:55:24
  • Multiple Updates