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

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From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200410-24 ] MIT krb5: Insecure temporary file use in send-pr.sh

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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@...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/1.0

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