Operating System:



05 October 2006

Protect yourself against future threats.

Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                         ESB-2006.0732 -- [Debian]
            New openssh-krb5 packages fix denial of service and
                   potential execution of arbitrary code
                              5 October 2006


        AusCERT Security Bulletin Summary

Product:              openssh-krb5
Publisher:            Debian
Operating System:     Debian GNU/Linux 3.1
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2006-5051 CVE-2006-4924

Ref:                  ESB-2006.0709

Original Bulletin:    http://www.debian.org/security/2006/dsa-1189

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

- - --------------------------------------------------------------------------
Debian Security Advisory DSA 1189-1                    security@debian.org
http://www.debian.org/security/                         Moritz Muehlenhoff
October 4th, 2006                       http://www.debian.org/security/faq
- - --------------------------------------------------------------------------

Package        : openssh-krb5
Vulnerability  : several
Problem-Type   : remote
Debian-specific: no
CVE ID         : CVE-2006-4924 CVE-2006-5051

Several remote vulnerabilities have been discovered in OpenSSH, a free
implementation of the Secure Shell protocol, which may lead to denial of
service and potentially the execution of arbitrary code. The Common
Vulnerabilities and Exposures project identifies the following problems:


    Tavis Ormandy of the Google Security Team discovered a denial of
    service vulnerability in the mitigation code against complexity
    attacks, which might lead to increased CPU consumption until a
    timeout is triggered. This is only exploitable if support for 
    SSH protocol version 1 is enabled.


    Mark Dowd discovered that insecure signal handler usage could
    potentially lead to execution of arbitrary code through a double
    free. The Debian Security Team doesn't believe the general openssh
    package without Kerberos support to be exploitable by this issue.
    However, due to the complexity of the underlying code we will
    issue an update to rule out all eventualities.

For the stable distribution (sarge) these problems have been fixed in
version 3.8.1p1-7sarge1.

For the unstable distribution (sid) these problems have been fixed in
version 4.3p2-4 of openssh. openssh-krb5 will soon be converted towards
a transitional package against openssh.

We recommend that you upgrade your openssh-krb5 packages.

Upgrade Instructions
- - --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.1 alias sarge
- - --------------------------------

  Source archives:

      Size/MD5 checksum:      693 d0a8ac5b868c5f84fd372c9ef597f3a6
      Size/MD5 checksum:   167076 1fcdbc92c7a0992711b2dc67b9923ba7
      Size/MD5 checksum:   795948 9ce6f2fa5b2931ce2c4c25f3af9ad50d

  Alpha architecture:

      Size/MD5 checksum:   909896 44611f5a619acf0bccdeb366d76f39c5

  AMD64 architecture:

      Size/MD5 checksum:   773658 dc8335560cead18af3fa4eb52911af92

  ARM architecture:

      Size/MD5 checksum:   689752 18e79d4e27c0ec313147e0951ef6082a

  HP Precision architecture:

      Size/MD5 checksum:   780142 5e692daa057c38f1fa1f0f877824e991

  Intel IA-32 architecture:

      Size/MD5 checksum:   706910 a4eda3cc320f77d2dc1065976086c31f

  Intel IA-64 architecture:

      Size/MD5 checksum:  1004916 91f89e80f1a27f942bd5fe9e7ae2ba3e

  Motorola 680x0 architecture:

      Size/MD5 checksum:   651232 8f41b159434ef7bf3187cd4954e816cc

  Big endian MIPS architecture:

      Size/MD5 checksum:   790716 cbc586aa73bcf295cd61f1c09e8015d8

  Little endian MIPS architecture:

      Size/MD5 checksum:   793644 3364603438fceb21bffdd3efb4887e0e

  PowerPC architecture:

      Size/MD5 checksum:   757954 ddb9cbba0e84f84da8e60fcbcbaddbae

  IBM S/390 architecture:

      Size/MD5 checksum:   771520 2148d40fa59dc98b94ac6a03ed2c444f

  Sun Sparc architecture:

      Size/MD5 checksum:   694800 9c059e2e4ba232774a522da0a2757f06

  These files will probably be moved into the stable distribution on
  its next update.

- - ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
Version: GnuPG v1.4.5 (GNU/Linux)


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.

Comment: http://www.auscert.org.au/render.html?it=1967