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Red Hat 6 RHSA-2011:1379-01 Moderate KDC Denial Of Service

red hat
Calendar Grey October 18, 2011
Dist Redhat Esm H88
This notice presents a significant krb5 security enhancement for Red Hat platforms, addressing multiple KDC vulnerabilities and improving overall reliability.
Updated krb5 packages that fix multiple 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/kb/docs/DOC-11259

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).
Multiple NULL pointer dereference and assertion failure flaws were found in the MIT Kerberos KDC when it was configured to use an LDAP (Lightweight Directory Access Protocol) or Berkeley Database (Berkeley DB) back end. A remote attacker could use these flaws to crash the KDC. (CVE-2011-1527, CVE-2011-1528, CVE-2011-1529)
Red Hat would like to thank the MIT Kerberos project for reporting the CVE-2011-1527 issue. Upstream acknowledges Andrej Ota as the original reporter of CVE-2011-1527.
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.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update krb5 network authentication KDC

References

https://access.redhat.com/security/cve/CVE-2011-1527 https://access.redhat.com/security/cve/CVE-2011-1528 https://access.redhat.com/security/cve/CVE-2011-1529 https://access.redhat.com/security/updates/classification#moderate http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-libs-1.9-9.el6_1.2.i686.rpm krb5-pkinit-openssl-1.9-9.el6_1.2.i686.rpm krb5-workstation-1.9-9.el6_1.2.i686.rpm
x86_64: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm krb5-libs-1.9-9.el6_1.2.i686.rpm krb5-libs-1.9-9.el6_1.2.x86_64.rpm krb5-pkinit-openssl-1.9-9.el6_1.2.x86_64.rpm krb5-workstation-1.9-9.el6_1.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-devel-1.9-9.el6_1.2.i686.rpm krb5-server-1.9-9.el6_1.2.i686.rpm krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
x86_64: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm krb5-devel-1.9-9.el6_1.2.i686.rpm krb5-devel-1.9-9.el6_1.2.x86_64.rpm krb5-server-1.9-9.el6_1.2.x86_64.rpm krb5-server-ldap-1.9-9.el6_1.2.i686.rpm krb5-server-ldap-1.9-9.el6_1.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm krb5-libs-1.9-9.el6_1.2.i686.rpm krb5-libs-1.9-9.el6_1.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
x86_64: krb5-debuginfo-1.9-9.el6_1.2.i686.rpm krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm

Read the Full Advisory


Severity
medium
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:1379-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:1379.html
Issue date: 2011-10-18

Topic

Updated krb5 packages that fix multiple security issues are now availablefor Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update krb5 network authentication 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

737711 - CVE-2011-1527 CVE-2011-1528 CVE-2011-1529 krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)

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