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Red Hat 6: RHSA-2011:0199-01 Important: krb5 Denial of Service

red hat
Calendar Grey February 8, 2011
Dist Redhat Esm H88
A significant security patch from Red Hat targets essential OpenSSL vulnerabilities to boost safeguarding measures for Enterprise Linux systems.
Updated krb5 packages that fix two security issues are now available for Red Hat Enterprise Linux 5

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

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).
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.

Topics%20covered

Topics Covered

security advisory denial of service Red Hat Enterprise Linux important krb5 update authentication flaw

References

https://access.redhat.com/security/cve/CVE-2011-0281 https://access.redhat.com/security/cve/CVE-2011-0282 https://access.redhat.com/security/updates/classification/#important http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-libs-1.6.1-55.el5_6.1.i386.rpm krb5-workstation-1.6.1-55.el5_6.1.i386.rpm
x86_64: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-debuginfo-1.6.1-55.el5_6.1.x86_64.rpm krb5-libs-1.6.1-55.el5_6.1.i386.rpm krb5-libs-1.6.1-55.el5_6.1.x86_64.rpm krb5-workstation-1.6.1-55.el5_6.1.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-devel-1.6.1-55.el5_6.1.i386.rpm krb5-server-1.6.1-55.el5_6.1.i386.rpm krb5-server-ldap-1.6.1-55.el5_6.1.i386.rpm
x86_64: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-debuginfo-1.6.1-55.el5_6.1.x86_64.rpm krb5-devel-1.6.1-55.el5_6.1.i386.rpm krb5-devel-1.6.1-55.el5_6.1.x86_64.rpm krb5-server-1.6.1-55.el5_6.1.x86_64.rpm krb5-server-ldap-1.6.1-55.el5_6.1.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-devel-1.6.1-55.el5_6.1.i386.rpm krb5-libs-1.6.1-55.el5_6.1.i386.rpm krb5-server-1.6.1-55.el5_6.1.i386.rpm krb5-server-ldap-1.6.1-55.el5_6.1.i386.rpm krb5-workstation-1.6.1-55.el5_6.1.i386.rpm
ia64: krb5-debuginfo-1.6.1-55.el5_6.1.i386.rpm krb5-debuginfo-1.6.1-55.el5_6.1.ia64.rpm krb5-devel-1.6.1-55.el5_6.1.ia64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:0199-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0199.html
Issue date: 2011-02-08

Topic

Updated krb5 packages that fix two security issues are now available forRed Hat Enterprise Linux 5.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 denial of service Red Hat Enterprise Linux important krb5 update authentication flaw

Relevant Releases Architectures

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Bugs Fixed

668719 - CVE-2011-0281 krb5: KDC hang when using LDAP backend caused by special principal name (MITKRB5-SA-2011-002)

668726 - CVE-2011-0282 krb5: KDC crash when using LDAP backend caused by a special principal name (MITKRB5-SA-2011-002)

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