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OpenBSD: 'OpenSSH 2.3.1' vulnerability Print E-mail
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Posted by Team   
OpenBSD There is a vulnerability in OpenSSH-2.3.1, a development snapshot.


                        OpenBSD Security Advisory

                            February 8, 2001

             Authentication By-Pass Vulnerability in OpenSSH-2.3.1



OpenSSH-2.3.1, a development snapshot, only checked if a public key
for public key authentication was permitted.  In the protocol 2 part
of the server, the challenge-response step that ensures that the
connecting client is in possession of the corresponding private key
has been omitted. As a result, anyone who could obtain the public key
listed in the users authorized_keys file could log in as that user
without authentication.

A fix for this problem was committed on Februrary 8th.  The problem
was introduced on January 18th.  This is a three week time window.



This vulnerability affects only OpenSSH version 2.3.1 with support for
protocol 2 enabled.  The latest official release OpenSSH 2.3.0 is not
affected by this problem.  The latest snapshot version OpenSSH 2.3.2
is not affected either.



If you installed the OpenSSH 2.3.1 development snapshot, install the
latest snapshot.  Currently, the latest snapshot is OpenSSH 2.3.2 which
is available via


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