Date: Mon, 6 Dec 2004 22:48:29 -0500
From: Luke Macken <lewk@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200412-04 ] Perl: Insecure temporary file creation
Cc: bugtraq@securityfocus.com, full-disclosure@lists.netsys.com,
security-alerts@linuxsecurity.com
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Gentoo Linux Security Advisory GLSA 200412-04
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http://security.gentoo.org/
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Severity: Normal
Title: Perl: Insecure temporary file creation
Date: December 07, 2004
Bugs: #66360
ID: 200412-04
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Synopsis
========
Perl is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files.
Background
==========
Perl is a stable, cross-platform programming language created by Larry
Wall.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-lang/perl < 5.8.5-r2 *>= 5.8.5-r2
>= 5.8.6-r1
dev-lang/perl == 5.8.6 *>= 5.8.5-r2
>= 5.8.6-r1
Description
===========
Some Perl modules create temporary files in world-writable directories
with predictable names.
Impact
======
A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When a
Perl script is executed, this would result in the file being
overwritten with the rights of the user running the utility, which
could be the root user.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Perl users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=perl-5.8.5-r2"
References
==========
[ 1 ] CAN-2004-0976
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0976
[ 2 ] Trustix Advisory #2004-0050
http://www.trustix.org/errata/2004/0050/
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200412-04.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 2004 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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