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X.Org X11 X Font Server Multiple Vulnerabilities Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA27040  
Release Date: 2007-10-03
Last Update: 2007-10-04

Critical:
Less critical
Impact: Privilege escalation
Where: Local system
Solution Status: Vendor Patch

Software:X Window System 11 (X11) 6.x
X Window System 11 (X11) 7.x

CVE reference:CVE-2007-4568 (Secunia mirror)
CVE-2007-4989 (Secunia mirror)
CVE-2007-4990 (Secunia mirror)

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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



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

17 Related Secunia Security Advisories, displaying 10

1. X.org X11 Multiple Vulnerabilities
2. X.org X11 Multiple Vulnerabilities
3. X.org X11 Composite Pixmap Privilege Escalation Vulnerability
4. X.Org X11 Multiple Vulnerabilities
5. X.Org X11 "DBE" and "Render" Extensions Vulnerabilities
6. libX11 XCOMPOSEFILE File Descriptor Leak
7. X.Org X11 X Display Manager "Xsession" Script Security Issue
8. X11 libXfont CID Encoded Fonts Integer Overflows
9. X11 "_XKB_CHARSET" Buffer Overflow Vulnerability
10. X.Org X11 setuid Security Issues

Show all related advisories


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