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Gentoo Linux Security Advisory                           GLSA 200603-26
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: bsd-games: Local privilege escalation in tetris-bsd
      Date: March 29, 2006
      Bugs: #122399
        ID: 200603-26

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Synopsis
=======
tetris-bsd is prone to local privilege escalation vulnerabilities.

Background
=========
bsd-games is a collection of NetBSD games ported to Linux.

Affected packages
================
    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  games-misc/bsd-games      < 2.17-r1                    >= 2.17-r1

Description
==========
Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that
the checkscores() function in scores.c reads in the data from the
/var/games/tetris-bsd.scores file without validation, rendering it
vulnerable to buffer overflows and incompatible with the system used
for managing games on Gentoo Linux. As a result, it cannot be played
securely on systems with multiple users. Please note that this is
probably a Gentoo-specific issue.

Impact
=====
A local user who is a member of group "games" may be able to modify the
tetris-bsd.scores file to trigger the execution of arbitrary code with
the privileges of other players.

Workaround
=========
Do not add untrusted users to the "games" group.

Resolution
=========
All bsd-games users are advised to update to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=games-misc/bsd-games-2.17-r1"

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

  https://security.gentoo.org/glsa/200603-26

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
https://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.

https://creativecommons.org/licenses/by-sa/2.0/