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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos kadmind RPC Library Array Overrun May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019635
SecurityTracker URL:  http://securitytracker.com/id/1019635
CVE Reference:   CVE-2008-0948   (Links to External Site)
Date:  Mar 18 2008
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5; libgssrpc and kadmind 1.2.2 to before 1.3 and 1.4 through 1.6.3
Description:   A vulnerability was reported in Kerberos in kadmind. A remote user can cause denial of service conditions. A remote user may be able to execute arbitrary code on the target system.

A remote user can send specially crafted data to cause a large number of file descriptors to be opened, triggering an array overflow. This can cause kadmind to crash or potentially execute arbitrary code.

Jeff Altman of Secure Endpoints reported this vulnerability.

Impact:   A remote user can cause kadmind to crash. It may also be possible to cause kadmind to execute arbitrary code.
Solution:   Red Hat has released a fix for CVE-2008-0948.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0181.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2008-002.txt (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1, 3

Message History:   This archive entry is a follow-up to the message listed below.
Mar 18 2008 Kerberos kadmind RPC Library Array Overrun May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2008:0181-01] Critical: krb5 security update


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

Synopsis:          Critical: krb5 security update
Advisory ID:       RHSA-2008:0181-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0181.html
Issue date:        2008-03-18
CVE Names:         CVE-2008-0062 CVE-2008-0063 CVE-2008-0948 
=====================================================================

1. Summary:

Updated krb5 packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1  - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other through use of symmetric encryption
and a trusted third party, the KDC.

A flaw was found in the way the MIT Kerberos Authentication Service and Key
Distribution Center server (krb5kdc) handled Kerberos v4 protocol packets.
An unauthenticated remote attacker could use this flaw to crash the
krb5kdc daemon, disclose portions of its memory, or possibly execute
arbitrary code using malformed or truncated Kerberos v4 protocol
requests. (CVE-2008-0062, CVE-2008-0063)

This issue only affected krb5kdc with Kerberos v4 protocol compatibility
enabled, which is the default setting on Red Hat Enterprise Linux 4.
Kerberos v4 protocol support can be disabled by adding "v4_mode=none"
(without the quotes) to the "[kdcdefaults]" section of
/var/kerberos/krb5kdc/kdc.conf.

A flaw was found in the RPC library used by the MIT Kerberos kadmind
server. An unauthenticated remote attacker could use this flaw to crash
kadmind. This issue only affected systems with certain resource limits
configured and did not affect systems using default resource limits used by
Red Hat Enterprise Linux 2.1 or 3. (CVE-2008-0948)

Red Hat would like to thank MIT for reporting these issues.

All krb5 users are advised to update to these erratum packages which
contain backported fixes to correct these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

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

432620 - CVE-2008-0062 krb5: uninitialized pointer use in krb5kdc
432621 - CVE-2008-0063 krb5: possible leak of sensitive data from krb5kdc using krb4 request
435087 - CVE-2008-0948 krb5: incorrect handling of high-numbered file descriptors in RPC library

6. Package List:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 :

Source:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/krb5-1.2.2-48.src.rpm

i386:
krb5-devel-1.2.2-48.i386.rpm
krb5-libs-1.2.2-48.i386.rpm
krb5-server-1.2.2-48.i386.rpm
krb5-workstation-1.2.2-48.i386.rpm

ia64:
krb5-devel-1.2.2-48.ia64.rpm
krb5-libs-1.2.2-48.ia64.rpm
krb5-server-1.2.2-48.ia64.rpm
krb5-workstation-1.2.2-48.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/krb5-1.2.2-48.src.rpm

ia64:
krb5-devel-1.2.2-48.ia64.rpm
krb5-libs-1.2.2-48.ia64.rpm
krb5-server-1.2.2-48.ia64.rpm
krb5-workstation-1.2.2-48.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/krb5-1.2.2-48.src.rpm

i386:
krb5-devel-1.2.2-48.i386.rpm
krb5-libs-1.2.2-48.i386.rpm
krb5-server-1.2.2-48.i386.rpm
krb5-workstation-1.2.2-48.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/krb5-1.2.2-48.src.rpm

i386:
krb5-devel-1.2.2-48.i386.rpm
krb5-libs-1.2.2-48.i386.rpm
krb5-server-1.2.2-48.i386.rpm
krb5-workstation-1.2.2-48.i386.rpm

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/krb5-1.2.7-68.src.rpm

i386:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-devel-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-server-1.2.7-68.i386.rpm
krb5-workstation-1.2.7-68.i386.rpm

ia64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.ia64.rpm
krb5-devel-1.2.7-68.ia64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.ia64.rpm
krb5-server-1.2.7-68.ia64.rpm
krb5-workstation-1.2.7-68.ia64.rpm

ppc:
krb5-debuginfo-1.2.7-68.ppc.rpm
krb5-debuginfo-1.2.7-68.ppc64.rpm
krb5-devel-1.2.7-68.ppc.rpm
krb5-libs-1.2.7-68.ppc.rpm
krb5-libs-1.2.7-68.ppc64.rpm
krb5-server-1.2.7-68.ppc.rpm
krb5-workstation-1.2.7-68.ppc.rpm

s390:
krb5-debuginfo-1.2.7-68.s390.rpm
krb5-devel-1.2.7-68.s390.rpm
krb5-libs-1.2.7-68.s390.rpm
krb5-server-1.2.7-68.s390.rpm
krb5-workstation-1.2.7-68.s390.rpm

s390x:
krb5-debuginfo-1.2.7-68.s390.rpm
krb5-debuginfo-1.2.7-68.s390x.rpm
krb5-devel-1.2.7-68.s390x.rpm
krb5-libs-1.2.7-68.s390.rpm
krb5-libs-1.2.7-68.s390x.rpm
krb5-server-1.2.7-68.s390x.rpm
krb5-workstation-1.2.7-68.s390x.rpm

x86_64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.x86_64.rpm
krb5-devel-1.2.7-68.x86_64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.x86_64.rpm
krb5-server-1.2.7-68.x86_64.rpm
krb5-workstation-1.2.7-68.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/krb5-1.2.7-68.src.rpm

i386:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-devel-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-server-1.2.7-68.i386.rpm
krb5-workstation-1.2.7-68.i386.rpm

x86_64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.x86_64.rpm
krb5-devel-1.2.7-68.x86_64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.x86_64.rpm
krb5-server-1.2.7-68.x86_64.rpm
krb5-workstation-1.2.7-68.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/krb5-1.2.7-68.src.rpm

i386:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-devel-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-server-1.2.7-68.i386.rpm
krb5-workstation-1.2.7-68.i386.rpm

ia64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.ia64.rpm
krb5-devel-1.2.7-68.ia64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.ia64.rpm
krb5-server-1.2.7-68.ia64.rpm
krb5-workstation-1.2.7-68.ia64.rpm

x86_64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.x86_64.rpm
krb5-devel-1.2.7-68.x86_64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.x86_64.rpm
krb5-server-1.2.7-68.x86_64.rpm
krb5-workstation-1.2.7-68.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/krb5-1.2.7-68.src.rpm

i386:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-devel-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-server-1.2.7-68.i386.rpm
krb5-workstation-1.2.7-68.i386.rpm

ia64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.ia64.rpm
krb5-devel-1.2.7-68.ia64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.ia64.rpm
krb5-server-1.2.7-68.ia64.rpm
krb5-workstation-1.2.7-68.ia64.rpm

x86_64:
krb5-debuginfo-1.2.7-68.i386.rpm
krb5-debuginfo-1.2.7-68.x86_64.rpm
krb5-devel-1.2.7-68.x86_64.rpm
krb5-libs-1.2.7-68.i386.rpm
krb5-libs-1.2.7-68.x86_64.rpm
krb5-server-1.2.7-68.x86_64.rpm
krb5-workstation-1.2.7-68.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0062
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0063
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0948
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2008 Red Hat, Inc.
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