full-disclosure - [ GLSA 200410-28 ] rssh: Format string vulnerability

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Message-ID: <417FB871.6090300@gentoo.org>
From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200410-28 ] rssh: Format string vulnerability

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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@...too.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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