Description
XDM in XFree86 3.3 and 3.3.3 generates easily guessable cookies using gettimeofday() when compiled with the HasXdmXauth option, which allows remote attackers to gain unauthorized access to the X display via a brute force attack.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- XFree86 X11R6 3.3 XDM - Session Cookie Guessing EDB-20993 · remote · Jun 24, 2001 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- xdm-cookie-brute-force(6808) vdb-entry
- 20010705 Re: xdm cookies fast brute force mailing-list
- 20010704 xdm cookies fast brute force mailing-list
- 2985 vdb-entry