Multiple vulnerabilities have been idenitified in X.Org X11 Server, which could be exploited by malicious authorized clients to disclose sensitive information, cause a denial of service or execute arbitrary code.
The first issue is caused by an invalid array index within the XFree86-Misc extension when processing "PassMessage" requests, which could be exploited by attackers to crash a vulnerable server or execute arbitrary code with "root" privileges.
The second vulnerability is caused by integer overflow errors in the EVI extension when processing "GetVisualInfo" requests, which could be exploited by attackers to crash a vulnerable server or execute arbitrary code with "root" privileges.
The third issue is caused by integer overflow errors in the MIT-SHM extension when allocating the pixmap, which could be exploited by attackers to crash a vulnerable server or execute arbitrary code with "root" privileges.
The fourth vulnerability is caused by a memory corruption error in the "ProcGetReservedColormapEntries()" function within the TOG-CUP extension, which could be exploited by attackers to read arbitrary memory data.
The fifth issue is caused by a memory corruption error in the Xinput extension when processing malformed requests, which could be exploited by attackers to crash a vulnerable server or execute arbitrary code with "root" privileges.
The sixth vulnerability is caused by a buffer overflow error when parsing PCF fonts, which could be exploited by malicious users to crash a vulnerable server or execute arbitrary code with "root" privileges.
The seventh issue is caused by a design error in the "X :1 -sp <file>" command when displaying error messages, which could be exploited by a malicious user to verify the existence of files and directories in restricted directories.
Credits
Vulnerabilities reported by regenrecht, VeriSign iDefense Labs, Takuya Shiozaki and CERT/CC.
ChangeLog
2008-01-18 : 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
