Security readout for executives and security teams
Plain-English summary
This flaw can make Firefox crash on affected Ubuntu Unity webapps systems. It is a denial-of-service issue, not a data theft or privilege escalation issue. Business urgency is mainly for legacy desktops or kiosk-like environments that still rely on the old Unity Firefox integration.
Executive priority
Treat this as a legacy endpoint availability issue. It should be addressed during routine patching unless affected systems support public kiosks, shared desktops, or operational workflows where browser crashes disrupt service.
Technical view
The issue involves improper resource handling in unity-firefox-extension/libunity-webapps. A callback could be dropped while still in use, then freed by Firefox, causing a crash after repeated launcher action callback updates hit a rate limit. The cited fix disables the Firefox extension by shipping an empty unity-firefox-extension package.
Likely exposure
Exposure appears limited to Ubuntu environments with affected Canonical unity-firefox-extension 3.0.0 or libunity-webapps 2.5.0 packages. Modern systems without this Unity Firefox integration are unlikely to be affected based on the provided sources.
Exploitation context
The CVSS vector requires user interaction and affects availability only. The source bundle does not show CISA KEV listing or active exploitation evidence. The described impact is crashing Firefox, not code execution.
Researcher notes
Evidence is limited to the CVE description, Ubuntu advisory, and Launchpad bug reference. The available sources describe a crash condition through callback lifetime misuse and a vendor fix that disables the extension. No exploit-in-the-wild evidence is provided.
Mitigation direction
- Update unity-firefox-extension to 3.0.0+14.04.20140416-0ubuntu1.14.04.1 or later.
- Follow Ubuntu USN-2743-3 package guidance for affected systems.
- Ensure the Unity Firefox extension is disabled by the vendor-fixed empty package.
- Prioritize removal from legacy desktop or kiosk images that still include Unity webapps.
Validation and detection
- Inventory systems for unity-firefox-extension and libunity-webapps package presence.
- Verify installed package versions against Ubuntu USN-2743-3.
- Confirm affected Firefox Unity integration is disabled after updating.
- Check desktop images and golden builds for obsolete Unity webapps packages.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2013-1055 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://ubuntu.com/USN-2743-3CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://launchpad.net/bugs/1175691CVE reference · vendor-advisory, x_refsource_UBUNTU
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Resource Shutdown or Release
Improper Resource Shutdown or Release represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.