FreeBSD kernel 4.6 and earlier closes the file descriptors 0, 1, and 2 after they have already been assigned to /dev/null when the descriptors reference procfs or linprocfs, which could allow local users to reuse the file descriptors in a setuid or setgid program to modify critical data and gain privileges.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 4.6 (including) | 4.6 (including) |
References
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc
- http://archives.neohapsis.com/archives/vulnwatch/2002-q3/0047.html
- http://groups.google.com/groups?hl=en\u0026lr=\u0026ie=UTF-8\u0026oe=UTF-8\u0026frame=right\u0026th=d429cd2ef1d3a2b7\u0026seekm=ai6c0q%242289%241%40FreeBSD.csie.NCTU.edu.tw#link16
- http://marc.info/?l=bugtraq\u0026m=102979180524452\u0026w=2
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc
- http://archives.neohapsis.com/archives/vulnwatch/2002-q3/0047.html
- http://groups.google.com/groups?hl=en\u0026lr=\u0026ie=UTF-8\u0026oe=UTF-8\u0026frame=right\u0026th=d429cd2ef1d3a2b7\u0026seekm=ai6c0q%242289%241%40FreeBSD.csie.NCTU.edu.tw#link16
- http://marc.info/?l=bugtraq\u0026m=102979180524452\u0026w=2