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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos Key Distribution Center (KDC) Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1025039
SecurityTracker URL:  http://securitytracker.com/id/1025039
CVE Reference:   CVE-2011-0281, CVE-2011-0282   (Links to External Site)
Date:  Feb 8 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5-1.6 and later
Description:   Several vulnerabilities were reported in the Kerberos Key Distribution Center (KDC). A remote user can cause denial of service conditions.

A remote user can send specially crafted data to a target KDC configured with an LDAP back end to cause the target service to become unresponsive [CVE-2011-0281] or crash [CVE-2011-0282].

A remote user can send specially crafted data to a target KDC configured with an arbitrary back end to cause the target service to crash [CVE-2011-0283]. Only version krb5-1.9 is affected.

Kevin Longfellow of Oracle Corporation and Zbysek Mraz of Red Hat each reported two of these vulnerabilities.


Impact:   A remote user can cause the target KDC to become unresponsive or crash.
Solution:   Red Hat has issued a fix for CVE-2011-0281 and CVE-2011-0282.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0199.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-002.txt (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Feb 8 2011 Kerberos Key Distribution Center (KDC) Bugs Let Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:0199-01] Important: krb5 security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: krb5 security update
Advisory ID:       RHSA-2011:0199-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0199.html
Issue date:        2011-02-08
CVE Names:         CVE-2011-0281 CVE-2011-0282 
=====================================================================

1. Summary:

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.

2. 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

3. 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.

4. 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
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

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)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-55.el5_6.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-55.el5_6.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-55.el5_6.1.src.rpm

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
krb5-libs-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.ia64.rpm
krb5-server-ldap-1.6.1-55.el5_6.1.ia64.rpm
krb5-workstation-1.6.1-55.el5_6.1.ia64.rpm

ppc:
krb5-debuginfo-1.6.1-55.el5_6.1.ppc.rpm
krb5-debuginfo-1.6.1-55.el5_6.1.ppc64.rpm
krb5-devel-1.6.1-55.el5_6.1.ppc.rpm
krb5-devel-1.6.1-55.el5_6.1.ppc64.rpm
krb5-libs-1.6.1-55.el5_6.1.ppc.rpm
krb5-libs-1.6.1-55.el5_6.1.ppc64.rpm
krb5-server-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.ppc.rpm

s390x:
krb5-debuginfo-1.6.1-55.el5_6.1.s390.rpm
krb5-debuginfo-1.6.1-55.el5_6.1.s390x.rpm
krb5-devel-1.6.1-55.el5_6.1.s390.rpm
krb5-devel-1.6.1-55.el5_6.1.s390x.rpm
krb5-libs-1.6.1-55.el5_6.1.s390.rpm
krb5-libs-1.6.1-55.el5_6.1.s390x.rpm
krb5-server-1.6.1-55.el5_6.1.s390x.rpm
krb5-server-ldap-1.6.1-55.el5_6.1.s390x.rpm
krb5-workstation-1.6.1-55.el5_6.1.s390x.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-libs-1.6.1-55.el5_6.1.i386.rpm
krb5-libs-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
krb5-workstation-1.6.1-55.el5_6.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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