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bsd-games: Local privilege escalation in tetris-bsd


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200603-26 / bsd-games
Release Date March 29, 2006
Latest Revision May 22, 2006: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
games-misc/bsd-games < 2.17-r1 >= 2.17-r1 All supported architectures

Related bugreports: #122399


tetris-bsd is prone to local privilege escalation vulnerabilities.

2.  Impact Information


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


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.


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.

3.  Resolution Information


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


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

Code Listing 3.1: Resolution

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

4.  References


Page updated March 29, 2006

Summary: This is a Gentoo Linux Security Advisory

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