[ GLSA 200410-24 ] MIT krb5: Insecure temporary file use in send-pr.sh

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200410-24
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: MIT krb5: Insecure temporary file use in send-pr.sh
      Date: October 25, 2004
      Bugs: #66359
        ID: 200410-24

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Synopsis
========

The send-pr.sh script, included in the mit-krb5 package, is vulnerable
to symlink attacks, potentially allowing a local user to overwrite
arbitrary files with the rights of the user running the utility.

Background
==========

MIT krb5 is the free implementation of the Kerberos network
authentication protocol written by the Massachusetts Institute of
Technology.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  app-crypt/mit-krb5      <= 1.3.5                      >= 1.3.5-r1
                                                          *>= 1.3.4-r1

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

The send-pr.sh script 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
send-pr.sh is called, 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 MIT krb5 users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=app-crypt/mit-krb5-1.3.4-r1"
    # emerge ">=app-crypt/mit-krb5-1.3.4-r1"

References
==========

  [ 1 ] CAN-2004-0971
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0971

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

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

  http://security.gentoo.org/glsa/glsa-200410-24.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/1.0

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