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Red Hat Enterprise 6 RHSA-2012:1131-01 Critical KDC DoS Fix

red hat
Calendar Grey July 31, 2012
Scroller Redhat
Important krb5 patch for Red Hat Enterprise Linux resolves two significant vulnerabilities concerning denial of service and KDC instability.
Updated krb5 packages that fix two security issues are now available for Red Hat Enterprise Linux 6

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/knowledge/articles/11258

Summary

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).
An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled initial authentication requests (AS-REQ). A remote, unauthenticated attacker could use this flaw to crash the KDC via a specially-crafted AS-REQ request. (CVE-2012-1015)
A NULL pointer dereference flaw was found in the MIT Kerberos administration daemon, kadmind. A Kerberos administrator who has the "create" privilege could use this flaw to crash kadmind. (CVE-2012-1013)
Red Hat would like to thank the MIT Kerberos project for reporting CVE-2012-1015. Upstream acknowledges Emmanuel Bouillon (NCI Agency) as the original reporter of CVE-2012-1015.
All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the krb5kdc and kadmind daemons will be restarted automatically.

Topics%20covered

Topics Covered

security advisory update critical DoS Red Hat Enterprise krb5 KDC

References

https://access.redhat.com/security/cve/CVE-2012-1013 https://access.redhat.com/security/cve/CVE-2012-1015 https://access.redhat.com/security/updates/classification/#important http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2012-001.txt

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: krb5-debuginfo-1.9-33.el6_3.2.i686.rpm krb5-libs-1.9-33.el6_3.2.i686.rpm krb5-pkinit-openssl-1.9-33.el6_3.2.i686.rpm krb5-workstation-1.9-33.el6_3.2.i686.rpm
x86_64: krb5-debuginfo-1.9-33.el6_3.2.i686.rpm krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm krb5-libs-1.9-33.el6_3.2.i686.rpm krb5-libs-1.9-33.el6_3.2.x86_64.rpm krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm krb5-workstation-1.9-33.el6_3.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: krb5-debuginfo-1.9-33.el6_3.2.i686.rpm krb5-devel-1.9-33.el6_3.2.i686.rpm krb5-server-1.9-33.el6_3.2.i686.rpm krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
x86_64: krb5-debuginfo-1.9-33.el6_3.2.i686.rpm krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm krb5-devel-1.9-33.el6_3.2.i686.rpm krb5-devel-1.9-33.el6_3.2.x86_64.rpm krb5-server-1.9-33.el6_3.2.x86_64.rpm krb5-server-ldap-1.9-33.el6_3.2.i686.rpm krb5-server-ldap-1.9-33.el6_3.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: krb5-debuginfo-1.9-33.el6_3.2.i686.rpm krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm krb5-libs-1.9-33.el6_3.2.i686.rpm krb5-libs-1.9-33.el6_3.2.x86_64.rpm krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm krb5-workstation-1.9-33.el6_3.2.x86_64.rpm


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2012:1131-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:1131.html
Issue date: 2012-07-31

Topic

Updated krb5 packages that fix two security issues are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. Common Vulnerability Scoring System (CVSS) basescores, which give detailed severity ratings, are available for eachvulnerability from the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory update critical DoS Red Hat Enterprise krb5 KDC

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

Bugs Fixed

827517 - CVE-2012-1013 krb5: kadmind denial of service

838012 - CVE-2012-1015 krb5: KDC daemon crash via free() of an uninitialized pointer

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