Issued:

2010-11-30

Updated:

2010-11-30

RHSA-2010:0925 - Important: krb5 security and bug fix update

Synopsis

Important: krb5 security and bug fix update

Type/Severity

Security Advisory Important

Topic

Updated krb5 packages that fix multiple security issues and one bug are now available for Red Hat Enterprise Linux 6.

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).

Multiple checksum validation flaws were discovered in the MIT Kerberos implementation. A remote attacker could use these flaws to tamper with certain Kerberos protocol packets and, possibly, bypass authentication or authorization mechanisms and escalate their privileges. (CVE-2010-1323, CVE-2010-1324, CVE-2010-4020)

Red Hat would like to thank the MIT Kerberos Team for reporting these issues.

This update also fixes the following bug:

• When attempting to perform PKINIT pre-authentication, if the client had more than one possible candidate certificate the client could fail to select the certificate and key to use. This usually occurred if certificate selection was configured to use the value of the keyUsage extension, or if any of the candidate certificates did not contain a subjectAltName extension. Consequently, the client attempted to perform pre-authentication using a different (usually password-based) mechanism. (BZ#644825)

All krb5 users should upgrade to these updated packages, which contain backported patches 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-server-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-libs-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-pkinit-openssl-1.8.2-3.el6_0.3.i686.rpm
• krb5-server-1.8.2-3.el6_0.3.s390x.rpm
• krb5-libs-1.8.2-3.el6_0.3.i686.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.ppc.rpm
• krb5-server-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.s390.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.i686.rpm
• krb5-devel-1.8.2-3.el6_0.3.ppc.rpm
• krb5-devel-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-server-1.8.2-3.el6_0.3.i686.rpm
• krb5-devel-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-pkinit-openssl-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-devel-1.8.2-3.el6_0.3.i686.rpm
• krb5-pkinit-openssl-1.8.2-3.el6_0.3.s390x.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.s390x.rpm
• krb5-devel-1.8.2-3.el6_0.3.s390.rpm
• krb5-libs-1.8.2-3.el6_0.3.s390x.rpm
• krb5-workstation-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-1.8.2-3.el6_0.3.src.rpm
• krb5-libs-1.8.2-3.el6_0.3.s390.rpm
• krb5-workstation-1.8.2-3.el6_0.3.i686.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-pkinit-openssl-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-devel-1.8.2-3.el6_0.3.s390x.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.i686.rpm
• krb5-workstation-1.8.2-3.el6_0.3.s390x.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.ppc.rpm
• krb5-libs-1.8.2-3.el6_0.3.ppc.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-server-ldap-1.8.2-3.el6_0.3.s390.rpm
• krb5-workstation-1.8.2-3.el6_0.3.x86_64.rpm
• krb5-libs-1.8.2-3.el6_0.3.ppc64.rpm
• krb5-debuginfo-1.8.2-3.el6_0.3.s390x.rpm

Fixes

• This content is not included.BZ - 644825
• This content is not included.BZ - 648674
• This content is not included.BZ - 648734
• This content is not included.BZ - 648735

CVEs

• CVE-2010-1323
• CVE-2010-4020
• CVE-2010-1324

References

• http://www.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-2010-007.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.