Gentoo Archives: gentoo-announce

From: Stefan Cornelius <dercorny@g.o>
To: gentoo-announce@l.g.o
Cc: bugtraq@×××××××××××××.com, full-disclosure@××××××××××××××.uk, security-alerts@×××××××××××××.com
Subject: [gentoo-announce] [ GLSA 200603-26 ] bsd-games: Local privilege escalation in tetris-bsd
Date: Wed, 29 Mar 2006 19:30:31
Message-Id: 200603292109.53105.dercorny@gentoo.org
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2 Gentoo Linux Security Advisory GLSA 200603-26
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4 http://security.gentoo.org/
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6
7 Severity: Normal
8 Title: bsd-games: Local privilege escalation in tetris-bsd
9 Date: March 29, 2006
10 Bugs: #122399
11 ID: 200603-26
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15 Synopsis
16 ========
17
18 tetris-bsd is prone to local privilege escalation vulnerabilities.
19
20 Background
21 ==========
22
23 bsd-games is a collection of NetBSD games ported to Linux.
24
25 Affected packages
26 =================
27
28 -------------------------------------------------------------------
29 Package / Vulnerable / Unaffected
30 -------------------------------------------------------------------
31 1 games-misc/bsd-games < 2.17-r1 >= 2.17-r1
32
33 Description
34 ===========
35
36 Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that
37 the checkscores() function in scores.c reads in the data from the
38 /var/games/tetris-bsd.scores file without validation, rendering it
39 vulnerable to buffer overflows and incompatible with the system used
40 for managing games on Gentoo Linux. As a result, it cannot be played
41 securely on systems with multiple users. Please note that this is
42 probably a Gentoo-specific issue.
43
44 Impact
45 ======
46
47 A local user who is a member of group "games" may be able to modify the
48 tetris-bsd.scores file to trigger the execution of arbitrary code with
49 the privileges of other players.
50
51 Workaround
52 ==========
53
54 Do not add untrusted users to the "games" group.
55
56 Resolution
57 ==========
58
59 All bsd-games users are advised to update to the latest version:
60
61 # emerge --sync
62 # emerge --ask --oneshot --verbose ">=games-misc/bsd-games-2.17-r1"
63
64 Availability
65 ============
66
67 This GLSA and any updates to it are available for viewing at
68 the Gentoo Security Website:
69
70 http://security.gentoo.org/glsa/glsa-200603-26.xml
71
72 Concerns?
73 =========
74
75 Security is a primary focus of Gentoo Linux and ensuring the
76 confidentiality and security of our users machines is of utmost
77 importance to us. Any security concerns should be addressed to
78 security@g.o or alternatively, you may file a bug at
79 http://bugs.gentoo.org.
80
81 License
82 =======
83
84 Copyright 2006 Gentoo Foundation, Inc; referenced text
85 belongs to its owner(s).
86
87 The contents of this document are licensed under the
88 Creative Commons - Attribution / Share Alike license.
89
90 http://creativecommons.org/licenses/by-sa/2.0