CVE-2002-0820
HighSummary
FreeBSD kernel 4.6 and earlier closes file descriptors 0, 1, and 2 after they have been assigned to /dev/null when the descriptors reference procfs or linprocfs. This could allow local users to reuse the file descriptors in a setuid or setgid program to modify critical data and gain privileges.
Risk Assessment
Local users could exploit this vulnerability to gain unauthorized privileges, posing a serious threat to system and data integrity.
Recommendation
It is recommended to update the FreeBSD kernel to a version newer than 4.6 to mitigate this vulnerability and to monitor the use of setuid and setgid programs.
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Original NVD description (English source)
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.