full-disclosure - [ GLSA 200512-15 ] rssh: Privilege escalation

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Message-ID: <200512271628.46209.dercorny@gentoo.org>
Date: Tue Dec 27 15:31:23 2005
From: dercorny at gentoo.org (Stefan Cornelius)
Subject: [ GLSA 200512-15 ] rssh: Privilege escalation

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Gentoo Linux Security Advisory                           GLSA 200512-15
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                                            http://security.gentoo.org/
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  Severity: High
     Title: rssh: Privilege escalation
      Date: December 27, 2005
      Bugs: #115082
        ID: 200512-15

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Synopsis
========

Local users could gain root privileges by chrooting into arbitrary
directories.

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       < 2.3.0                            >= 2.3.0

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

Max Vozeler discovered that the rssh_chroot_helper command allows local
users to chroot into arbitrary directories.

Impact
======

A local attacker could exploit this vulnerability to gain root
privileges by chrooting into arbitrary directories.

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-2.3.0"

References
==========

  [ 1 ] CVE-2005-3345
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3345
  [ 2 ] 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-200512-15.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 2005 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/2.0
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