GLSA Advocate
Joined: 12 May 2004 Posts: 2663
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Posted: Tue Sep 18, 2007 11:26 pm Post subject: [ GLSA 200709-11 ] GDM: Local Denial of Service |
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Gentoo Linux Security Advisory
Title: GDM: Local Denial of Service (GLSA 200709-11)
Severity: low
Exploitable: local
Date: September 18, 2007
Bug(s): #187919
ID: 200709-11
Synopsis
GDM can be crashed by a local user, preventing it from managing future displays.
Background
GDM is the GNOME display manager.
Affected Packages
Package: gnome-base/gdm
Vulnerable: < 2.18.4
Unaffected: >= 2.18.4
Unaffected: >= 2.16.7 < 2.16.8
Architectures: All supported architectures
Description
The result of a g_strsplit() call is incorrectly parsed in the files daemon/gdm.c, daemon/gdmconfig.c, gui/gdmconfig.c and gui/gdmflexiserver.c, allowing for a null pointer dereference.
Impact
A local user could send a crafted message to /tmp/.gdm_socket that would trigger the null pointer dereference and crash GDM, thus preventing it from managing future displays.
Workaround
Restrict the write permissions on /tmp/.gdm_socket to trusted users only after each GDM restart.
Resolution
All GDM users should upgrade to the latest version: Code: | # emerge --sync
# emerge --ask --oneshot --verbose "gnome-base/gdm" |
References
CVE-2007-3381 |
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