full-disclosure - [ GLSA 200512-13 ] Dropbear: Privilege escalation

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Message-ID: <200512231235.16584.dercorny@gentoo.org>
Date: Fri Dec 23 11:37:10 2005
From: dercorny at gentoo.org (Stefan Cornelius)
Subject: [ GLSA 200512-13 ] Dropbear: Privilege escalation

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Gentoo Linux Security Advisory                           GLSA 200512-13
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Dropbear: Privilege escalation
      Date: December 23, 2005
      Bugs: #116006
        ID: 200512-13

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Synopsis
========

A buffer overflow in Dropbear could allow authenticated users to
execute arbitrary code as the root user.

Background
==========

Dropbear is an SSH server and client with a small memory footprint.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  net-misc/dropbear       < 0.47                            >= 0.47

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

Under certain conditions Dropbear could fail to allocate a sufficient
amount of memory, possibly resulting in a buffer overflow.

Impact
======

By sending specially crafted data to the server, authenticated users
could exploit this vulnerability to execute arbitrary code with the
permissions of the SSH server user, which is the root user by default.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Dropbear users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/dropbear-0.47"

References
==========

  [ 1 ] CVE-2005-4178
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-4178

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

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

  http://security.gentoo.org/glsa/glsa-200512-13.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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