full-disclosure - [ GLSA 200411-22 ] Davfs2, lvm-user: Insecure tempfile handling

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From: jaervosz at gentoo.org (Sune Kloppenborg Jeppesen)
Subject: [ GLSA 200411-22 ] Davfs2, lvm-user: Insecure tempfile handling

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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
=================

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  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
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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@...too.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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