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Gentoo Linux Security Advisory GLSA 200411-15
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http://security.gentoo.org/
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Severity: Normal
Title: OpenSSL, Groff: Insecure tempfile handling
Date: November 08, 2004
Bugs: #68404, #68407
ID: 200411-15
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Synopsis
========
groffer, included in the Groff package, and the der_chop script,
included in the OpenSSL package, are both vulnerable to symlink
attacks, potentially allowing a local user to overwrite arbitrary
files with the rights of the user running the utility.
Background
==========
OpenSSL is a toolkit implementing the Secure Sockets Layer and
Transport Layer Security protocols as well as a general-purpose
cryptography library. It includes the der_chop script, which is used to
convert DER-encoded certificates to PEM format. Groff (GNU Troff) is a
typesetting package which reads plain text mixed with formatting
commands and produces formatted output. It includes groffer, a command
used to display groff files and man pages on X and tty.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/openssl < 0.9.7d-r2 >= 0.9.7d-r2
2 sys-apps/groff < 1.19.1-r2 >= 1.19.1-r2
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------
Description
===========
groffer and the der_chop script create temporary files in
world-writeable 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
groffer or der_chop 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 Groff users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/groff-1.19.1-r2"
All OpenSSL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7d-r2"
Note: /etc/ssl/misc/der_chop is protected by Portage as a configuration
file. Don't forget to use etc-update and overwrite the old version with
the new one.
References
==========
[ 1 ] CAN-2004-0969
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0969
[ 2 ] CAN-2004-0975
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0975
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200411-15.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 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/1.0
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