Joined: 12 May 2004
|Posted: Tue Sep 18, 2007 11:26 pm Post subject: [ GLSA 200709-11 ] GDM: Local Denial of Service
|Gentoo Linux Security Advisory
Title: GDM: Local Denial of Service (GLSA 200709-11)
Date: September 18, 2007
GDM can be crashed by a local user, preventing it from managing future displays.
GDM is the GNOME display manager.
Vulnerable: < 2.18.4
Unaffected: >= 2.18.4
Unaffected: >= 2.16.7 < 2.16.8
Architectures: All supported architectures
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.
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.
Restrict the write permissions on /tmp/.gdm_socket to trusted users only after each GDM restart.
All GDM users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose "gnome-base/gdm"