Gentoo Archives: gentoo-announce

From: Raphael Marichez <falco@g.o>
To: gentoo-announce@g.o
Cc: bugtraq@×××××××××××××.com, full-disclosure@××××××××××××××.uk, security-alerts@×××××××××××××.com
Subject: [gentoo-announce] [ GLSA 200709-11 ] GDM: Local Denial of Service
Date: Tue, 18 Sep 2007 22:03:16
Message-Id: 20070918213355.GD27586@falco.falcal.net
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2 Gentoo Linux Security Advisory GLSA 200709-11
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4 http://security.gentoo.org/
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6
7 Severity: Low
8 Title: GDM: Local Denial of Service
9 Date: September 18, 2007
10 Bugs: #187919
11 ID: 200709-11
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14
15 Synopsis
16 ========
17
18 GDM can be crashed by a local user, preventing it from managing future
19 displays.
20
21 Background
22 ==========
23
24 GDM is the GNOME display manager.
25
26 Affected packages
27 =================
28
29 -------------------------------------------------------------------
30 Package / Vulnerable / Unaffected
31 -------------------------------------------------------------------
32 1 gnome-base/gdm < 2.18.4 >= 2.18.4
33 *>= 2.16.7
34
35 Description
36 ===========
37
38 The result of a g_strsplit() call is incorrectly parsed in the files
39 daemon/gdm.c, daemon/gdmconfig.c, gui/gdmconfig.c and
40 gui/gdmflexiserver.c, allowing for a null pointer dereference.
41
42 Impact
43 ======
44
45 A local user could send a crafted message to /tmp/.gdm_socket that
46 would trigger the null pointer dereference and crash GDM, thus
47 preventing it from managing future displays.
48
49 Workaround
50 ==========
51
52 Restrict the write permissions on /tmp/.gdm_socket to trusted users
53 only after each GDM restart.
54
55 Resolution
56 ==========
57
58 All GDM users should upgrade to the latest version:
59
60 # emerge --sync
61 # emerge --ask --oneshot --verbose "gnome-base/gdm"
62
63 References
64 ==========
65
66 [ 1 ] CVE-2007-3381
67 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3381
68
69 Availability
70 ============
71
72 This GLSA and any updates to it are available for viewing at
73 the Gentoo Security Website:
74
75 http://security.gentoo.org/glsa/glsa-200709-11.xml
76
77 Concerns?
78 =========
79
80 Security is a primary focus of Gentoo Linux and ensuring the
81 confidentiality and security of our users machines is of utmost
82 importance to us. Any security concerns should be addressed to
83 security@g.o or alternatively, you may file a bug at
84 http://bugs.gentoo.org.
85
86 License
87 =======
88
89 Copyright 2007 Gentoo Foundation, Inc; referenced text
90 belongs to its owner(s).
91
92 The contents of this document are licensed under the
93 Creative Commons - Attribution / Share Alike license.
94
95 http://creativecommons.org/licenses/by-sa/2.5