GLSA 200512-17 scponly: Multiple privilege escalation issues
Posted on: 12/29/2005 11:32 AM

A new security update has been released for Gentoo Linux - scponly: Multiple privilege escalation issues. Here the announcement:

Gentoo Linux Security Advisory GLSA 200512-17
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http://security.gentoo.org/
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Severity: High
Title: scponly: Multiple privilege escalation issues
Date: December 29, 2005
Bugs: #116526
ID: 200512-17

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Synopsis
========

Local users can exploit an scponly flaw to gain root privileges, and
scponly restricted users can use another vulnerability to evade shell
restrictions.

Background
==========

scponly is a restricted shell, allowing only a few predefined commands.
It is often used as a complement to OpenSSH to provide access to remote
users without providing any remote execution privileges.

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

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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/scponly lt; 4.2 gt;= 4.2

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

Max Vozeler discovered that the scponlyc command allows users to chroot
into arbitrary directories. Furthermore, Pekka Pessi reported that
scponly insufficiently validates command-line parameters to a scp or
rsync command.

Impact
======

A local attacker could gain root privileges by chrooting into arbitrary
directories containing hardlinks to setuid programs. A remote scponly
user could also send malicious parameters to a scp or rsync command
that would allow to escape the shell restrictions and execute arbitrary
programs.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All scponly users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=net-misc/scponly-4.2"

References
==========

[ 1 ] scponly release notes
http://sublimation.org/scponly/index.html#relnotes

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

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

http://security.gentoo.org/glsa/glsa-200512-17.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 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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