[ GLSA 200410-28 ] rssh: Format string vulnerability

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200410-28
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                                            http://security.gentoo.org/
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  Severity: High
     Title: rssh: Format string vulnerability
      Date: October 27, 2004
      Bugs: #66988
        ID: 200410-28

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Synopsis
========

rssh is vulnerable to a format string vulnerability that allows
arbitrary execution of code with the rights of the connected user,
thereby bypassing rssh restrictions.

Background
==========

rssh is a restricted shell, allowing only a few commands like scp or
sftp. It is often used as a complement to OpenSSH to provide limited
access to users.

Affected packages
=================

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  app-shells/rssh       < 2.2.2                            >= 2.2.2

Description
===========

Florian Schilhabel from the Gentoo Linux Security Audit Team found a
format string vulnerability in rssh syslogging of failed commands.

Impact
======

Using a malicious command, it may be possible for a remote
authenticated user to execute arbitrary code on the target machine with
user rights, effectively bypassing any restriction of rssh.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All rssh users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-shells/rssh-2.2.2"

References
==========

  [ 1 ] rssh security announcement
        http://www.pizzashack.org/rssh/security.shtml

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200410-28.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0

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