Issued:

2009-04-07

Updated:

2009-04-07

RHSA-2009:0408 - Important: krb5 security update

Synopsis

Important: krb5 security update

Type/Severity

Security Advisory Important

Topic

Updated krb5 packages that fix various security issues are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red Hat Security Response Team.

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). The Generic Security Service Application Program Interface (GSS-API) definition provides security services to callers (protocols) in a generic fashion. The Simple and Protected GSS-API Negotiation (SPNEGO) mechanism is used by GSS-API peers to choose from a common set of security mechanisms.

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. (CVE-2009-0846)

Multiple input validation flaws were found in the MIT Kerberos GSS-API library's implementation of the SPNEGO mechanism. A remote attacker could use these flaws to crash any network service utilizing the MIT Kerberos GSS-API library to authenticate users or, possibly, leak portions of the service's memory. (CVE-2009-0844, CVE-2009-0845)

All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. All running services using the MIT Kerberos libraries must be restarted for the update to take effect.

Solution

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

This update is available via 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-libs-1.6.1-31.el5_3.3.i386.rpm
• krb5-devel-1.6.1-31.el5_3.3.ppc64.rpm
• krb5-devel-1.6.1-31.el5_3.3.s390x.rpm
• krb5-libs-1.6.1-31.el5_3.3.s390.rpm
• krb5-devel-1.6.1-31.el5_3.3.i386.rpm
• krb5-workstation-1.6.1-31.el5_3.3.ia64.rpm
• krb5-libs-1.6.1-31.el5_3.3.ppc64.rpm
• krb5-libs-1.6.1-31.el5_3.3.x86_64.rpm
• krb5-workstation-1.6.1-31.el5_3.3.s390x.rpm
• krb5-devel-1.6.1-31.el5_3.3.ia64.rpm
• krb5-server-1.6.1-31.el5_3.3.i386.rpm
• krb5-devel-1.6.1-31.el5_3.3.ppc.rpm
• krb5-workstation-1.6.1-31.el5_3.3.i386.rpm
• krb5-server-1.6.1-31.el5_3.3.s390x.rpm
• krb5-libs-1.6.1-31.el5_3.3.ppc.rpm
• krb5-devel-1.6.1-31.el5_3.3.s390.rpm
• krb5-workstation-1.6.1-31.el5_3.3.x86_64.rpm
• krb5-libs-1.6.1-31.el5_3.3.s390x.rpm
• krb5-server-1.6.1-31.el5_3.3.x86_64.rpm
• krb5-1.6.1-31.el5_3.3.src.rpm
• krb5-workstation-1.6.1-31.el5_3.3.ppc.rpm
• krb5-server-1.6.1-31.el5_3.3.ia64.rpm
• krb5-libs-1.6.1-31.el5_3.3.ia64.rpm
• krb5-server-1.6.1-31.el5_3.3.ppc.rpm
• krb5-devel-1.6.1-31.el5_3.3.x86_64.rpm

Fixes

• This content is not included.BZ - 490634
• This content is not included.BZ - 491033
• This content is not included.BZ - 491036

CVEs

• CVE-2009-0846
• CVE-2009-0844
• CVE-2009-0845

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-2009-001.txt
• Content from web.mit.edu is not included.Content from web.mit.edu is not included.http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-002.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.