Issued:

2011-02-08

Updated:

2011-02-08

RHSA-2011:0199 - Important: krb5 security update

Synopsis

Important: krb5 security update

Type/Severity

Security Advisory Important

Topic

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.

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 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.

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 This content is not included.http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

Updated Packages

• krb5-devel-1.6.1-55.el5_6.1.ppc.rpm
• krb5-workstation-1.6.1-55.el5_6.1.x86_64.rpm
• krb5-server-ldap-1.6.1-55.el5_6.1.i386.rpm
• krb5-workstation-1.6.1-55.el5_6.1.ppc.rpm
• krb5-libs-1.6.1-55.el5_6.1.x86_64.rpm
• krb5-server-1.6.1-55.el5_6.1.s390x.rpm
• krb5-devel-1.6.1-55.el5_6.1.ppc64.rpm
• krb5-devel-1.6.1-55.el5_6.1.s390x.rpm
• krb5-libs-1.6.1-55.el5_6.1.ppc.rpm
• krb5-server-ldap-1.6.1-55.el5_6.1.ppc.rpm
• krb5-workstation-1.6.1-55.el5_6.1.ia64.rpm
• krb5-workstation-1.6.1-55.el5_6.1.i386.rpm
• krb5-libs-1.6.1-55.el5_6.1.ia64.rpm
• krb5-server-1.6.1-55.el5_6.1.x86_64.rpm
• krb5-libs-1.6.1-55.el5_6.1.ppc64.rpm
• krb5-server-1.6.1-55.el5_6.1.ia64.rpm
• krb5-devel-1.6.1-55.el5_6.1.s390.rpm
• krb5-server-ldap-1.6.1-55.el5_6.1.s390x.rpm
• krb5-devel-1.6.1-55.el5_6.1.i386.rpm
• krb5-libs-1.6.1-55.el5_6.1.s390.rpm
• krb5-server-ldap-1.6.1-55.el5_6.1.x86_64.rpm
• krb5-libs-1.6.1-55.el5_6.1.s390x.rpm
• krb5-devel-1.6.1-55.el5_6.1.ia64.rpm
• krb5-server-1.6.1-55.el5_6.1.i386.rpm
• krb5-libs-1.6.1-55.el5_6.1.i386.rpm
• krb5-devel-1.6.1-55.el5_6.1.x86_64.rpm
• krb5-workstation-1.6.1-55.el5_6.1.s390x.rpm
• krb5-server-ldap-1.6.1-55.el5_6.1.ia64.rpm
• krb5-server-1.6.1-55.el5_6.1.ppc.rpm
• krb5-1.6.1-55.el5_6.1.src.rpm

Fixes

• This content is not included.BZ - 668719
• This content is not included.BZ - 668726

CVEs

• CVE-2011-0281
• CVE-2011-0282

References

• https://access.redhat.com/security/updates/classification/#important
• Content from web.mit.edu is not included.Content from web.mit.edu is not included.http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.