CVE-2002-0820 Information

Description

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.

Reference

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&lr=&ie=UTF-8&oe=UTF-8&frame=right&th=d429cd2ef1d3a2b7&seekm=ai6c0q24228924140FreeBSD.csie.NCTU.edu.twlink16 http://marc.info/?l=bugtraq&m=102979180524452&w=2