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Asterisk Security Team
2008-May-22 14:54 UTC
[asterisk-announce] /home/putnopvut/asa/AST-2008-007/AST-2008-007: AST-2008-007 Cryptographic keys generated by OpenSSL on Debian-based systems compromised

Asterisk Project Security Advisory - AST-2008-007

   +------------------------------------------------------------------------+
   |      Product       | Asterisk                                          |
   |--------------------+---------------------------------------------------|
   |      Summary       | Asterisk installations using cryptographic keys   |
   |                    | generated by Debian-based systems may be using a  |
   |                    | vulnerable implementation of OpenSSL              |
   |--------------------+---------------------------------------------------|
   | Nature of Advisory | Compromised cryptographic keys                    |
   |--------------------+---------------------------------------------------|
   |   Susceptibility   | Users of RSA for IAX2 authentication and users of |
   |                    | DUNDi                                             |
   |--------------------+---------------------------------------------------|
   |      Severity      | Critical                                          |
   |--------------------+---------------------------------------------------|
   |   Exploits Known   | None specific to Asterisk, but OpenSSL exploits   |
   |                    | are circulating                                   |
   |--------------------+---------------------------------------------------|
   |    Reported On     | 13 May 2008                                       |
   |--------------------+---------------------------------------------------|
   |    Reported By     | Luciano Bello                                     |
   |--------------------+---------------------------------------------------|
   |     Posted On      | May 16, 2008                                      |
   |--------------------+---------------------------------------------------|
   |  Last Updated On   | May 22, 2008                                      |
   |--------------------+---------------------------------------------------|
   |  Advisory Contact  | Mark Michelson < mmichelson AT digium DOT com > 
|
   |--------------------+---------------------------------------------------|
   |      CVE Name      | CVE-2008-0166                                     |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   | Description | The Debian team recently announced that cryptographic    |
   |             | keys generated by their OpenSSL package were created     |
   |             | using a random number generator with predictable         |
   |             | results. This affects Debian's stable and unstable      
|
   |             | distributions, as well as Debian-derived systems such as |
   |             | Ubuntu. See the links in the "Links" session of
this     |
   |             | advisory for more information about the vulnerability.   |
   |             |                                                          |
   |             | Asterisk is not directly affected by this vulnerability; |
   |             | however, Asterisk's 'astgenkey' script uses
OpenSSL in   |
   |             | order to generate cryptographic keys. Therefore,         |
   |             | Asterisk users who use RSA for authentication of IAX2    |
   |             | calls and who use DUNDi may be using compromised keys.   |
   |             | This vulnerability affects any such installation whose   |
   |             | cryptographic keys were generated on a Debian-based      |
   |             | system, even if the Asterisk installation itself is not  |
   |             | on a Debian-based system.                                |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   | Resolution | Since this is not a vulnerability in Asterisk itself but  |
   |            | in a tool that Asterisk uses, there will be no new        |
   |            | releases made; however, users who are affected by the     |
   |            | Debian OpenSSL vulnerability are strongly encouraged to   |
   |            | upgrade their package of OpenSSL to an uncompromised      |
   |            | version (version 0.9.8c-4 or later) and regenerate all    |
   |            | keys used by Asterisk.                                    |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   |                           Affected Versions                            |
   |------------------------------------------------------------------------|
   |              Product              | Release Series |                   |
   |-----------------------------------+----------------+-------------------|
   |       Asterisk Open Source        |     1.0.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |       Asterisk Open Source        |     1.2.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |       Asterisk Open Source        |     1.4.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |     Asterisk Business Edition     |     A.x.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |     Asterisk Business Edition     |     B.x.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |     Asterisk Business Edition     |     C.x.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |            AsteriskNOW            |  pre-release   | N/A               |
   |-----------------------------------+----------------+-------------------|
   | Asterisk Appliance Developer Kit  |     0.x.x      | N/A               |
   |-----------------------------------+----------------+-------------------|
   |    s800i (Asterisk Appliance)     |     1.0.x      | N/A               |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   |                              Corrected In                              |
   |------------------------------------------------------------------------|
   |              Product               |              Release              |
   |------------------------------------+-----------------------------------|
   |                N/A                 |                N/A                |
   |------------------------------------+-----------------------------------|
   |------------------------------------+-----------------------------------|
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   |     Links      | http://www.debian.org/security/2008/dsa-1571          |
   |                |                                                       |
   |                | http://wiki.debian.org/SSLkeys                        |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   | Asterisk Project Security Advisories are posted at                     |
   | http://www.asterisk.org/security                                       |
   |                                                                        |
   | This document may be superseded by later versions; if so, the latest   |
   | version will be posted at                                              |
   | http://downloads.digium.com/pub/security/AST-2008-007.pdf and          |
   | http://downloads.digium.com/pub/security/AST-2008-007.html             |
   +------------------------------------------------------------------------+

   +------------------------------------------------------------------------+
   |                            Revision History                            |
   |------------------------------------------------------------------------|
   |       Date        |        Editor        |       Revisions Made        |
   |-------------------+----------------------+-----------------------------|
   | May 15, 2008      | Mark Michelson       | Initial advisory            |
   +------------------------------------------------------------------------+

               Asterisk Project Security Advisory - AST-2008-007
              Copyright (c) 2008 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.
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