[Full-disclosure] [ GLSA 200602-14 ] noweb: Insecure temporary file creation

[Thierry Carrez]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200602-14
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: noweb: Insecure temporary file creation
      Date: February 26, 2006
      Bugs: #122705
        ID: 200602-14

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

noweb is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files.

Background
==========

noweb is a simple, extensible, and language independent literate
programming tool.

Affected packages
=================

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  app-text/noweb      < 2.9-r5                            >= 2.9-r5

Description
===========

Javier Fernandez-Sanguino has discovered that the lib/toascii.nw and
shell/roff.mm scripts insecurely create temporary files with
predictable filenames.

Impact
======

A local attacker could create symbolic links in the temporary file
directory, pointing to a valid file somewhere on the filesystem. When
an affected script is called, this would result in the file being
overwritten with the rights of the user running the script.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All noweb users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/noweb-2.9-r5"

References
==========

  [ 1 ] CVE-2005-3342
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3342

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200602-14.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 at gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2006 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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 256 bytes
Desc: OpenPGP digital signature
Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20060226/6ee3e738/attachment.bin