FreeBSD 4.3 does not properly clear shared signal handlers when executing a process, which allows local users to gain privileges by calling…

published 2001-07-10 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-1161

cvss: 7.2; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

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.

Patch / fix

links 3

archives.neohapsis.com/archives/bugtraq/2001-07/0179.html advisory
kb.cert.org/vuls/id/943633 advisory
securityfocus.com/bid/3007 advisory

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

archives.neohapsis.com http://archives.neohapsis.com/archives/bugtraq/2001-07/0179.html referenced PoC, tagged "exploit" by a source, unverified
securityfocus.com http://www.securityfocus.com/bid/3007 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

References

archives.neohapsis.com /archives/bugtraq/2001-07/0179.html
mailing-list, exploit, patch, vendor-advisory
kb.cert.org /vuls/id/943633
third-party-advisory, patch, us-government-resource
securityfocus.com /bid/3007
vdb-entry, exploit, patch, vendor-advisory
ciac.llnl.gov /ciac/bulletins/l-111.shtml
third-party-advisory, government-resource
exchange.xforce.ibmcloud.com /vulnerabilities/6829
vdb-entry
osvdb.org /1897
vdb-entry

Sources

CVE List CVE-2001-1180
NVD CVE-2001-1180

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary