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Gentoo Linux Security Advisory GLSA 200411-22
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http://security.gentoo.org/
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Severity: Normal
Title: Davfs2, lvm-user: Insecure tempfile handling
Date: November 11, 2004
Bugs: #68406, #69149
ID: 200411-22
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Synopsis
========
Davfs2 and the lvmcreate_initrd script (included in the lvm-user
package) are both vulnerable to symlink attacks, potentially allowing
a local user to overwrite arbitrary files with the rights of the user
running them.
Background
==========
Davfs2 is a file system driver that allows you to mount a WebDAV server
as a local disk drive. lvm-user is a package providing userland
utilities for LVM (Logical Volume Management) 1.x features.
Affected packages
=================
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Package / Vulnerable / Unaffected
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1 net-fs/davfs2 < 0.2.2-r1 >= 0.2.2-r1
2 sys-fs/lvm-user < 1.0.7-r2 >= 1.0.7-r2
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2 affected packages on all of their supported architectures.
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Description
===========
Florian Schilhabel from the Gentoo Linux Security Audit Team found that
Davfs2 insecurely created .pid files in /tmp. Furthermore, Trustix
Secure Linux found that the lvmcreate_initrd script, included in the
lvm-user Gentoo package, also creates 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
Davfs2 or lvmcreate_initrd is called, this would result in the file
being overwritten with the rights of the user running the software,
which could be the root user.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Davfs2 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-fs/davfs2-0.2.2-r1"
All lvm-user users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-fs/lvm-user-1.0.7-r2"
References
==========
[ 1 ] CAN-2004-0972
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0972
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200411-22.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/2.0
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