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XFree Weak Session Cookies Advisory Available in Danish 

Secunia Advisory: SA9757  
Release Date: 2003-09-17

Critical:
Less critical
Impact: System access
Where: From local network
Solution Status: Vendor Patch

Software:XFree86 4.3.x

CVE reference:CVE-2003-0692 (Secunia mirror)

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Description:
A vulnerability has been identified XFree possibly allowing malicious people to brute force session cookies.

The algorithm which generates the 128 bit session cookies is weak, potentially allowing malicious people to brute force the session cookie. This could potentially be exploited by malicious people on the local network to gain system access.

Solution:
This has been fixed in 4.3.99.13 development snapshot. Secunia does not recommend the use of development edition except when strictly necessary.

Secunia recommend that you restrict access to X so that only trusted IP adresses can connect.

Provided and/or discovered by:
George Lebl

Original Advisory:
http://www.xfree86.org/security/



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.

9 Related Secunia Security Advisories

1. XFree86 X Font Server Multiple Vulnerabilities
2. XFree86 Multiple Vulnerabilities
3. XFree86 "DBE" and "Render" Extensions Vulnerabilities
4. XFree86 CID Encoded Fonts Integer Overflows
5. XFree86 PCF Integer Overflow Vulnerabilities
6. XFree86 Pixmap Creation Integer Overflow Vulnerability
7. XFree86 Multiple Vulnerabilities
8. XFree86 "font.alias" File Parsing Privilege Escalation Vulnerabilities
9. XFree86 Multiple Integer Overflow Vulnerabilities


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