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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos KDC Database Propagation Daemon Input Validation Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1025040
SecurityTracker URL:  http://securitytracker.com/id/1025040
CVE Reference:   CVE-2010-4022   (Links to External Site)
Date:  Feb 9 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5-1.7 and later
Description:   A vulnerability was reported in the Kerberos KDC Database Propagation Daemon. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to the target MIT krb5 KDC database propagation daemon (kpropd) to cause the daemon to terminate its listening process. This will prevent database propagations to the KDC host on which the daemon was running.

Configurations where kpropd is running in standalone mode (the "-S" option) is affected.

Configurations where kpropd runs in incremental propagation mode ("iprop") or as an inetd server are not affected.

Keiichi Mori of Red Hat reported this vulnerability.

Impact:   A remote user can cause denial of service conditions.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0200.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-001.txt (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Feb 8 2011 Kerberos KDC Database Propagation Daemon Input Validation Flaw Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:0200-01] Important: krb5 security update

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

Synopsis:          Important: krb5 security update
Advisory ID:       RHSA-2011:0200-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0200.html
Issue date:        2011-02-08
CVE Names:         CVE-2010-4022 CVE-2011-0281 CVE-2011-0282 
=====================================================================

1. Summary:

Updated krb5 packages that fix three security issues 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - 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)

A denial of service flaw was found in the way the MIT Kerberos V5 slave KDC
update server (kpropd) processed certain update requests for KDC database
propagation. A remote attacker could use this flaw to terminate the kpropd
daemon via a specially-crafted update request. (CVE-2010-4022)

Red Hat would like to thank the MIT Kerberos Team for reporting the
CVE-2011-0282 and CVE-2011-0281 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
backported patches 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/):

664009 - CVE-2010-4022 krb5: kpropd unexpected termination on invalid input (MITKRB5-SA-2011-001)
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. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.i686.rpm
krb5-workstation-1.8.2-3.el6_0.4.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.4.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-server-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.i686.rpm
krb5-server-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-workstation-1.8.2-3.el6_0.4.i686.rpm

ppc64:
krb5-debuginfo-1.8.2-3.el6_0.4.ppc.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.ppc64.rpm
krb5-devel-1.8.2-3.el6_0.4.ppc.rpm
krb5-devel-1.8.2-3.el6_0.4.ppc64.rpm
krb5-libs-1.8.2-3.el6_0.4.ppc.rpm
krb5-libs-1.8.2-3.el6_0.4.ppc64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.ppc64.rpm
krb5-server-1.8.2-3.el6_0.4.ppc64.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.ppc.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.ppc64.rpm
krb5-workstation-1.8.2-3.el6_0.4.ppc64.rpm

s390x:
krb5-debuginfo-1.8.2-3.el6_0.4.s390.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.s390x.rpm
krb5-devel-1.8.2-3.el6_0.4.s390.rpm
krb5-devel-1.8.2-3.el6_0.4.s390x.rpm
krb5-libs-1.8.2-3.el6_0.4.s390.rpm
krb5-libs-1.8.2-3.el6_0.4.s390x.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.s390x.rpm
krb5-server-1.8.2-3.el6_0.4.s390x.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.s390.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.s390x.rpm
krb5-workstation-1.8.2-3.el6_0.4.s390x.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.8.2-3.el6_0.4.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.i686.rpm
krb5-server-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-workstation-1.8.2-3.el6_0.4.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.4.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.4.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.4.i686.rpm
krb5-devel-1.8.2-3.el6_0.4.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.4.i686.rpm
krb5-libs-1.8.2-3.el6_0.4.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-1.8.2-3.el6_0.4.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.4.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.4.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-2010-4022.html
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-2011-001.txt
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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