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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos kpasswd UDP Processing Lets Remote Users Deny Service
SecurityTracker Alert ID:  1028663
SecurityTracker URL:  http://securitytracker.com/id/1028663
CVE Reference:   CVE-2002-2443   (Links to External Site)
Date:  Jun 12 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in MIT Kerberos. A remote user can cause denial of service conditions.

A remote user can send spoofed UDP packets to a target kadmind server running kpasswd to cause kpasswd to pass the UDP packets to the spoofed address and reply to the packets, consume excessive CPU resources and bandwidth.

This type of exploit is known as a UDP ping-pong attack.

Impact:   A remote user can consume excessive CPU resources on the target system and bandwidth on the target network.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2013-0942.html

Vendor URL:  web.mit.edu/kerberos/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6

Message History:   This archive entry is a follow-up to the message listed below.
May 15 2013 Kerberos kpasswd UDP Processing Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2013:0942-01] Moderate: krb5 security update

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

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2013:0942-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0942.html
Issue date:        2013-06-12
CVE Names:         CVE-2002-2443 
=====================================================================

1. Summary:

Updated krb5 packages that fix one security issue are now available for
Red Hat Enterprise Linux 5 and 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:

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
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).

It was found that kadmind's kpasswd service did not perform any validation
on incoming network packets, causing it to reply to all requests. A remote
attacker could use this flaw to send spoofed packets to a kpasswd
service that appear to come from kadmind on a different server, causing the
services to keep replying packets to each other, consuming network
bandwidth and CPU. (CVE-2002-2443)

All krb5 users should upgrade to these updated packages, which contain a
backported patch to correct this issue. After installing the updated
packages, the krb5kdc and kadmind daemons 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/knowledge/articles/11258

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

962531 - CVE-2002-2443 krb5: UDP ping-pong flaw in kpasswd

6. Package List:

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-70.el5_9.2.src.rpm

i386:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-libs-1.6.1-70.el5_9.2.i386.rpm
krb5-workstation-1.6.1-70.el5_9.2.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.x86_64.rpm
krb5-libs-1.6.1-70.el5_9.2.i386.rpm
krb5-libs-1.6.1-70.el5_9.2.x86_64.rpm
krb5-workstation-1.6.1-70.el5_9.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-70.el5_9.2.src.rpm

i386:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-devel-1.6.1-70.el5_9.2.i386.rpm
krb5-server-1.6.1-70.el5_9.2.i386.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.x86_64.rpm
krb5-devel-1.6.1-70.el5_9.2.i386.rpm
krb5-devel-1.6.1-70.el5_9.2.x86_64.rpm
krb5-server-1.6.1-70.el5_9.2.x86_64.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-70.el5_9.2.src.rpm

i386:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-devel-1.6.1-70.el5_9.2.i386.rpm
krb5-libs-1.6.1-70.el5_9.2.i386.rpm
krb5-server-1.6.1-70.el5_9.2.i386.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.i386.rpm
krb5-workstation-1.6.1-70.el5_9.2.i386.rpm

ia64:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.ia64.rpm
krb5-devel-1.6.1-70.el5_9.2.ia64.rpm
krb5-libs-1.6.1-70.el5_9.2.i386.rpm
krb5-libs-1.6.1-70.el5_9.2.ia64.rpm
krb5-server-1.6.1-70.el5_9.2.ia64.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.ia64.rpm
krb5-workstation-1.6.1-70.el5_9.2.ia64.rpm

ppc:
krb5-debuginfo-1.6.1-70.el5_9.2.ppc.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.ppc64.rpm
krb5-devel-1.6.1-70.el5_9.2.ppc.rpm
krb5-devel-1.6.1-70.el5_9.2.ppc64.rpm
krb5-libs-1.6.1-70.el5_9.2.ppc.rpm
krb5-libs-1.6.1-70.el5_9.2.ppc64.rpm
krb5-server-1.6.1-70.el5_9.2.ppc.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.ppc.rpm
krb5-workstation-1.6.1-70.el5_9.2.ppc.rpm

s390x:
krb5-debuginfo-1.6.1-70.el5_9.2.s390.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.s390x.rpm
krb5-devel-1.6.1-70.el5_9.2.s390.rpm
krb5-devel-1.6.1-70.el5_9.2.s390x.rpm
krb5-libs-1.6.1-70.el5_9.2.s390.rpm
krb5-libs-1.6.1-70.el5_9.2.s390x.rpm
krb5-server-1.6.1-70.el5_9.2.s390x.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.s390x.rpm
krb5-workstation-1.6.1-70.el5_9.2.s390x.rpm

x86_64:
krb5-debuginfo-1.6.1-70.el5_9.2.i386.rpm
krb5-debuginfo-1.6.1-70.el5_9.2.x86_64.rpm
krb5-devel-1.6.1-70.el5_9.2.i386.rpm
krb5-devel-1.6.1-70.el5_9.2.x86_64.rpm
krb5-libs-1.6.1-70.el5_9.2.i386.rpm
krb5-libs-1.6.1-70.el5_9.2.x86_64.rpm
krb5-server-1.6.1-70.el5_9.2.x86_64.rpm
krb5-server-ldap-1.6.1-70.el5_9.2.x86_64.rpm
krb5-workstation-1.6.1-70.el5_9.2.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.3.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.i686.rpm
krb5-workstation-1.10.3-10.el6_4.3.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.3.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-server-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.10.3-10.el6_4.3.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.3.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/krb5-1.10.3-10.el6_4.3.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.10.3-10.el6_4.3.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.i686.rpm
krb5-server-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-workstation-1.10.3-10.el6_4.3.i686.rpm

ppc64:
krb5-debuginfo-1.10.3-10.el6_4.3.ppc.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.ppc64.rpm
krb5-devel-1.10.3-10.el6_4.3.ppc.rpm
krb5-devel-1.10.3-10.el6_4.3.ppc64.rpm
krb5-libs-1.10.3-10.el6_4.3.ppc.rpm
krb5-libs-1.10.3-10.el6_4.3.ppc64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.ppc64.rpm
krb5-server-1.10.3-10.el6_4.3.ppc64.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.ppc.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.ppc64.rpm
krb5-workstation-1.10.3-10.el6_4.3.ppc64.rpm

s390x:
krb5-debuginfo-1.10.3-10.el6_4.3.s390.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.s390x.rpm
krb5-devel-1.10.3-10.el6_4.3.s390.rpm
krb5-devel-1.10.3-10.el6_4.3.s390x.rpm
krb5-libs-1.10.3-10.el6_4.3.s390.rpm
krb5-libs-1.10.3-10.el6_4.3.s390x.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.s390x.rpm
krb5-server-1.10.3-10.el6_4.3.s390x.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.s390.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.s390x.rpm
krb5-workstation-1.10.3-10.el6_4.3.s390x.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.10.3-10.el6_4.3.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.i686.rpm
krb5-server-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-workstation-1.10.3-10.el6_4.3.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.3.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.3.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.3.i686.rpm
krb5-devel-1.10.3-10.el6_4.3.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.3.i686.rpm
krb5-libs-1.10.3-10.el6_4.3.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-1.10.3-10.el6_4.3.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.3.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.3.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-2002-2443.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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