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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
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1 net-misc/scponly < 4.2 >= 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 ">=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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