Description
xlockmore and xlockf do not properly cleanse user-injected format strings, which allows local users to gain root privileges via the -d option.
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 2
- David Bagley xlock 4.16 - User Supplied Format String (2) EDB-20154 · local · Oct 21, 2000 · verified
- David Bagley xlock 4.16 - User Supplied Format String (1) EDB-20153 · local · Aug 15, 2000 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 20000816 xlockmore: possible shadow file compromise vendor-advisory
- FreeBSD-SA-00:44.xlockmore vendor-advisory
- 20000816 xlock vulnerability mailing-list
- 20000823 MDKSA-2000:038 - xlockmore update mailing-list
- 1585 vdb-entry
- 20000817 Conectiva Linux Security Announcement - xlockmore mailing-list