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Gentoo Linux Security Advisory GLSA 200709-11 |
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http://security.gentoo.org/ |
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|
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Severity: Low |
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Title: GDM: Local Denial of Service |
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Date: September 18, 2007 |
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Bugs: #187919 |
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ID: 200709-11 |
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|
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Synopsis |
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======== |
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|
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GDM can be crashed by a local user, preventing it from managing future |
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displays. |
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|
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Background |
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========== |
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|
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GDM is the GNOME display manager. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 gnome-base/gdm < 2.18.4 >= 2.18.4 |
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*>= 2.16.7 |
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|
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Description |
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=========== |
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|
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The result of a g_strsplit() call is incorrectly parsed in the files |
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daemon/gdm.c, daemon/gdmconfig.c, gui/gdmconfig.c and |
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gui/gdmflexiserver.c, allowing for a null pointer dereference. |
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|
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Impact |
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====== |
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|
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A local user could send a crafted message to /tmp/.gdm_socket that |
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would trigger the null pointer dereference and crash GDM, thus |
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preventing it from managing future displays. |
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|
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Workaround |
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========== |
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|
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Restrict the write permissions on /tmp/.gdm_socket to trusted users |
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only after each GDM restart. |
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|
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Resolution |
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========== |
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|
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All GDM users should upgrade to the latest version: |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose "gnome-base/gdm" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2007-3381 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3381 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200709-11.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2007 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |