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X.Org X11 X Font Server Multiple Vulnerabilities
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Secunia Advisory:
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SA27040
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Release Date:
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2007-10-03
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Last Update:
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2007-10-04
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Popularity:
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9,082 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | X Window System 11 (X11) 6.x
X Window System 11 (X11) 7.x
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| CVE reference: | CVE-2007-4568
CVE-2007-4989
CVE-2007-4990
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Description:
Some vulnerabilities have been reported in the X.Org X11 X Font Server (XFS), which can be exploited by malicious, local users to gain escalated privileges.
1) An integer overflow exists within the handlers for the X protocol requests "QueryXBitmaps" and "QueryXExtents", which do not correctly check the "length" parameters before passing them to the "build_range()" function. This can be exploited to cause a heap-based buffer overflow by sending specially crafted "QueryXBitmaps" and "QueryXExtents" requests to a vulnerable service.
2) An error exists within the handler for the X protocol requests "QueryXBitmaps" and "QueryXExtents" when calling the "swap_char2b()" function, which can be exploited to swap an arbitrary number of bytes on the heap, resulting in a heap corruption.
Note: On certain systems (e.g. Sun Solaris), these vulnerabilities may be remotely exploitable through port 7100/TCP.
The vulnerabilities are reported in X.Org XFS 1.0.4 (X11R7.2 and X11R7.3) and prior.
Solution:
Update to X.Org XFS 1.0.5.
Provided and/or discovered by:
Sean Larsson, VeriSign iDefense Labs
Changelog:
2007-10-03: Added CVE reference.
2007-10-04: Added CVE references.
Original Advisory:
X.Org:
http://lists.freedesktop.org/archives/xorg-announce/2007-October/000416.html
iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=602
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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