OpenSSH Security Advisory (Score: 1/#0) - Jeudi 01 Août à 17:34  
Ajouté par falbala ( #722 )  
 
Niels Provos annonce sur les listes d'Open :
 
"Systèmes infectés :
OpenSSH version 3.2.2p1, 3.4p1 et 3.4 sont infectés sur le FTP d'OpenBSD et probablement d'autres miroirs ... L'infection a eu lieu entre le 30 et 31 juillet ...
 
Impact :
...(les systèmes avec OpenSSH installé entre ces deux dates sont foutus) ...
 
Solution :
...Vérifiez vos MD5 :
MD5 (openssh-3.4p1.tar.gz) = 459c1d0262e939d6432f193c7a4ba8a8
MD5 (openssh-3.4p1.tar.gz.sig) = d5a956263287e7fd261528bb1962f24c
MD5 (openssh-3.4.tgz) = 39659226ff5b0d16d0290b21f67c46f2
MD5 (openssh-3.2.2p1.tar.gz) = 9d3e1e31e8d6cdbfa3036cb183aa4a01
MD5 (openssh-3.2.2p1.tar.gz.sig) = be4f9ed8da1735efd770dc8fa2bb808a
"
 
Le plus drôle (enfin, si c'est drôle) c'est que le demime sur les dites listes a viré son pgp-signature ;-)
[ Répondre ]  
 

Tue Jul 30 19:45:52 PDT 2002
patches/packages/openssh-3.4p1-i386-2.tgz: Recompiled against openssl-0.9.6e.
       This update also contains a fix to the installation script to ensure that the
 [...]

  The  CERT/CC  has received confirmation that some copies of the source
   code  for the OpenSSH package were modified by an intruder and contain
   a Trojan horse.
 
   We  strongly encourage sites which employ, redistribute, or mirror the
   OpenSSH   package   to  immediately  verify  the  integrity  of  their
   distribution.
 
I. Description
 
   The  CERT/CC  has received confirmation that some copies of the source
   code  for  the  OpenSSH  package have been modified by an intruder and
   contain  a  Trojan  horse. The following advisory has been released by
   the OpenSSH development team
 
          http://www.openssh.com/txt/trojan.adv
 
   The following files were modified to include the malicious code:
 
     openssh-3.4p1.tar.gz
     openssh-3.4.tgz
     openssh-3.2.2p1.tar.gz
 
   These  files  appear to have been placed on the FTP server which hosts
   ftp.openssh.com and ftp.openbsd.org on the 30th or 31st of July, 2002.
   The OpenSSH development team replaced the Trojan horse copies with the
   original,  uncompromised  versions at 13:00 UTC, August 1st, 2002. The
   Trojan  horse  copy  of  the source code was available long enough for
   copies to propagate to sites that mirror the OpenSSH site.
 
   The  Trojan  horse  versions of OpenSSH contain malicious code that is
   run  when  the  software  is  compiled.  This code connects to a fixed
   remote  server  on  6667/tcp.  It can then open a shell running as the
   user who compiled OpenSSH.
 
II. Impact
 
   An intruder operating from (or able to impersonate) the remote address
   specified in the malicious code can gain unauthorized remote access to
   any  host  which  compiled a version of OpenSSH from this Trojan horse
   version  of  the source code. The level of access would be that of the
   user who compiled the source code.
 
III. Solution
 
   We  encourage  sites who downloaded a copy of the OpenSSH distribution
   to  verify the authenticity of their distribution, regardless of where
   it  was  obtained.  Furthermore, we encourage users to inspect any and
   all  software that may have been downloaded from the compromised site.
   Note  that  it is not sufficient to rely on the timestamps or sizes of
   the  file  when  trying to determine whether or not you have a copy of
   the Trojan horse version.
 
Where to get OpenSSH
 
   The primary distribution site for OpenSSH is
 
          http://www.openssh.com/
 
   Sites that mirror the OpenSSH source code are encouraged to verify the
   integrity of their sources.
 
Verify MD5 checksums
 
   You  can  use  the  following MD5 checksums to verify the integrity of
   your OpenSSH source code distribution:
   Correct versions:
 
     459c1d0262e939d6432f193c7a4ba8a8 openssh-3.4p1.tar.gz
     d5a956263287e7fd261528bb1962f24c openssh-3.4p1.tar.gz.sig
     39659226ff5b0d16d0290b21f67c46f2 openssh-3.4.tgz
     9d3e1e31e8d6cdbfa3036cb183aa4a01 openssh-3.2.2p1.tar.gz
     be4f9ed8da1735efd770dc8fa2bb808a openssh-3.2.2p1.tar.gz.sig
 
   At  least  one  version of the modified Trojan horse distributions was
   reported to have the following checksum:
   Trojan horse version:
 
     3ac9bc346d736b4a51d676faa2a08a57 openssh-3.4p1.tar.gz
 
Verify PGP signature
 
   Additionally,  distributions  of  the  portable release of OpenSSH are
   distributed  with  detached PGP signatures. Note that the Trojan horse
   versions  were  not  signed  correctly,  and  attempts  to  verify the
   signatures would have failed.
 
   As a matter of good security practice, the CERT/CC encourages users to
   verify,  whenever  possible, the integrity of downloaded software. For
   more information, see
 
          http://www.cert.org/incident_notes/IN-2001-06.html
 
Appendix A. - Vendor Information
 
   This  appendix  contains  information  provided  by  vendors  for this
   advisory.  As  vendors  report new information to the CERT/CC, we will
   update this section and note the changes in our revision history. If a
   particular  vendor  is  not  listed  below, we have not received their
   comments.
 
Connectiva Linux
 
     Conectiva Linux distributes openssh-3.4p1 as a security update. The
     distributed  copy  is  the original one and is not affected by this
     trojan.  The  detached  digital  signature is always checked before
     building third party packages.
 
MandrakeSoft
 
     MandrakeSoft  has  verified  that the openssh-3.4p1 sources used to
     build  it's  latest  updates (ref. MDKSA-2002:040-1) do not contain
     this trojan.