Multiple vulnerabilities have been idenitified in X.Org X11 Server, which could be exploited by attackers to cause a denial of service or execute arbitrary code.
The first issue is caused by integer overflow errors within the handlers for the "QueryXBitmaps" and "QueryXExtents" protocol requests when calling the "build_range()" function, which could be exploited by attackers to cause a heap overflow and compromise a vulnerable system via a specially crafted request.
The second vulnerability is caused by memory corruption errors within the handlers for the "QueryXBitmaps" and "QueryXExtents" protocol requests when calling the "swap_char2b()" function, which could be exploited by attackers to swap an arbitrary number of bytes on the heap.
Credits
Vulnerabilities reported by Sean Larsson (VeriSign iDefense Labs).
ChangeLog
2007-10-03 : Initial release
Vulnerability Management
Subscribe to FrSIRT VNS and receive real-time e-mail and SMS alerts when new vulnerabilities, exploits, or patches relevant to your systems and network configurations are available.
Feedback
If you have additional information or corrections for this security advisory please submit them via our contact form or by email to updates@frsirt.com.
French
