GLSA 200411-22: Davfs2, lvm-user: Insecure tempfile handling
Posted on: 11/11/2004 06:33 PM

Security updates for Davfs2, lvm-user are available for Gentoo Linux

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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@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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