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Gentoo Linux Security Advisory GLSA 200506-08
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http://security.gentoo.org/
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Severity: Normal
Title: GNU shtool, ocaml-mysql: Insecure temporary file creation
Date: June 11, 2005
Bugs: #93782, #93784
ID: 200506-08
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Synopsis
========
GNU shtool and ocaml-mysql are vulnerable to symlink attacks,
potentially allowing a local user to overwrite arbitrary files.
Background
==========
GNU shtool is a compilation of small shell scripts into a single shell
tool. The ocaml-mysql package includes the GNU shtool code.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-util/shtool < 2.0.1-r2 >= 2.0.1-r2
2 dev-ml/ocaml-mysql < 1.0.3-r1 >= 1.0.3-r1
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------
Description
===========
Eric Romang has discovered that GNU shtool insecurely creates temporary
files with predictable filenames (CAN-2005-1751). On closer inspection,
Gentoo Security discovered that the shtool temporary file, once
created, was being reused insecurely (CAN-2005-1759).
Impact
======
A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When a
GNU shtool script is executed, this would result in the file being
overwritten with the rights of the user running the script, which could
be the root user.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All GNU shtool users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-util/shtool-2.0.1-r2"
All ocaml-mysql users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-ml/ocaml-mysql-1.0.3-r1"
References
==========
[ 1 ] CAN-2005-1751
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1751
[ 2 ] CAN-2005-1759
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1759
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200506-08.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@xxxxxxxxxx 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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