Description
FreeBSD 4.5 and earlier, and possibly other BSD-based operating systems, allows local users to write to or read from restricted files by closing the file descriptors 0 (standard input), 1 (standard output), or 2 (standard error), which may then be reused by a called setuid process that intended to perform I/O on normal files.
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
- Apple Mac OSX 10.x / FreeBSD 4.x / OpenBSD 2.x / Solaris 2.5/2.6/7.0/8 - 'exec C Library' Standard I/O File Descriptor Closure EDB-21407 · local · Apr 23, 2002 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- bsd-suid-apps-gain-privileges(8920) vdb-entry
- 4568 vdb-entry
- VU#809347 third-party-advisory
- 6095 vdb-entry
- 20020422 Pine Internet Advisory: Setuid application execution may give local root in FreeBSD mailing-list
- M-072 third-party-advisory government-resource
- 20020422 Pine Internet Advisory: Setuid application execution may give local root in FreeBSD mailing-list
- 20020423 cheers mailing-list