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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos kadmind Can Be Crashed By a Remote Users Conducting an NMAP Scan
SecurityTracker Alert ID:  1025361
SecurityTracker URL:  http://securitytracker.com/id/1025361
CVE Reference:   CVE-2011-0285   (Links to External Site)
Date:  Apr 14 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): krb5-1.7 - krb5-1.9
Description:   A vulnerability was reported in Kerberos. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to cause the target kadmind service to free an invalid pointer and crash.

A demonstration exploit command is provided:

nmap -n -sV [target]

The original advisory is available at:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621726

Felipe Ortega reported this vulnerability.

Impact:   A remote user can cause kadmind to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0447.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-004.txt (Links to External Site)
Cause:   Access control 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.
Apr 12 2011 Kerberos kadmind Can Be Crashed By a Remote Users Conducting an NMAP Scan



 Source Message Contents

Subject:  [RHSA-2011:0447-01] Moderate: krb5 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2011:0447-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0447.html
Issue date:        2011-04-14
CVE Names:         CVE-2011-0285 
=====================================================================

1. Summary:

Updated krb5 packages that fix one security issue are now available for Red
Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link 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).

An invalid free flaw was found in the password-changing capability of the
MIT Kerberos administration daemon, kadmind. A remote, unauthenticated
attacker could use this flaw to cause kadmind to abort via a
specially-crafted request. (CVE-2011-0285)

All krb5 users should upgrade to these updated packages, which contain a
backported patch to correct this issue. After installing the updated
packages, the kadmind 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
https://access.redhat.com/kb/docs/DOC-11259

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

696334 - CVE-2011-0285 krb5: kadmind invalid pointer free() (MITKRB5-SA-004)

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_0.7.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.i686.rpm
krb5-workstation-1.8.2-3.el6_0.7.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.7.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_0.7.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-server-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.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_0.7.src.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.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_0.7.src.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.7.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_0.7.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.i686.rpm
krb5-server-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-workstation-1.8.2-3.el6_0.7.i686.rpm

ppc64:
krb5-debuginfo-1.8.2-3.el6_0.7.ppc.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.ppc64.rpm
krb5-devel-1.8.2-3.el6_0.7.ppc.rpm
krb5-devel-1.8.2-3.el6_0.7.ppc64.rpm
krb5-libs-1.8.2-3.el6_0.7.ppc.rpm
krb5-libs-1.8.2-3.el6_0.7.ppc64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.ppc64.rpm
krb5-server-1.8.2-3.el6_0.7.ppc64.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.ppc.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.ppc64.rpm
krb5-workstation-1.8.2-3.el6_0.7.ppc64.rpm

s390x:
krb5-debuginfo-1.8.2-3.el6_0.7.s390.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.s390x.rpm
krb5-devel-1.8.2-3.el6_0.7.s390.rpm
krb5-devel-1.8.2-3.el6_0.7.s390x.rpm
krb5-libs-1.8.2-3.el6_0.7.s390.rpm
krb5-libs-1.8.2-3.el6_0.7.s390x.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.s390x.rpm
krb5-server-1.8.2-3.el6_0.7.s390x.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.s390.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.s390x.rpm
krb5-workstation-1.8.2-3.el6_0.7.s390x.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.7.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_0.7.src.rpm

i386:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.i686.rpm
krb5-server-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-workstation-1.8.2-3.el6_0.7.i686.rpm

x86_64:
krb5-debuginfo-1.8.2-3.el6_0.7.i686.rpm
krb5-debuginfo-1.8.2-3.el6_0.7.x86_64.rpm
krb5-devel-1.8.2-3.el6_0.7.i686.rpm
krb5-devel-1.8.2-3.el6_0.7.x86_64.rpm
krb5-libs-1.8.2-3.el6_0.7.i686.rpm
krb5-libs-1.8.2-3.el6_0.7.x86_64.rpm
krb5-pkinit-openssl-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-1.8.2-3.el6_0.7.x86_64.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.i686.rpm
krb5-server-ldap-1.8.2-3.el6_0.7.x86_64.rpm
krb5-workstation-1.8.2-3.el6_0.7.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-2011-0285.html
https://access.redhat.com/security/updates/classification/#moderate
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-004.txt

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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