FreeBSD Security Advisory FreeBSD-SA-01:42 - A flaw exists in FreeBSD signal handler clearing that would allow for some signal handlers to remain in effect after the exec. Most of the signals were cleared, but some signal handlers were not. This allowed an attacker to execute arbitrary code in the context of a setuid binary. All versions of 4.x prior to the correction date including and 4.3-RELEASE are vulnerable to this problem.
FreeBSD Security Advisory FreeBSD-SA-01:42 - A flaw exists in FreeBSD signal handler clearing that would allow for some signal handlers to remain in effect after the exec. Most of the signals were cleared, but some signal handlers were not. This allowed an attacker to execute arbitrary code in the context of a setuid binary. All versions of 4.x prior to the correction date including and 4.3-RELEASE are vulnerable to this problem.