Privilege Escalation via Shared Signal Handlers in FreeBSD 4.3

CVE-2001-1180 · HIGH Severity

AV:L/AC:L/AU:N/C:C/I:C/A:C

FreeBSD 4.3 does not properly clear shared signal handlers when executing a process, which allows local users to gain privileges by calling rfork with a shared signal handler, having the child process execute a setuid program, and sending a signal to the child.

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