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CVE-2021-43540

Status Candidate

Overview

WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.

Related Files

Ubuntu Security Notice USN-5186-2
Posted Dec 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5186-2 - USN-5186-1 fixed vulnerabilities in Firefox. The update introduced several minor regressions. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, conduct spoofing attacks, bypass CSP restrictions, or execute arbitrary code. A security issue was discovered with the handling of WebExtension permissions. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to create and install a service worker that wouldn't be uninstalled with the extension. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, spoof, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-43539, CVE-2021-43540, CVE-2021-43545
SHA-256 | 71f03a3798d3b2136f7ae62ff10ef21526eb028ad4aa002d8298173d9df59667
Ubuntu Security Notice USN-5186-1
Posted Dec 10, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5186-1 - Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, conduct spoofing attacks, bypass CSP restrictions, or execute arbitrary code. A security issue was discovered with the handling of WebExtension permissions. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to create and install a service worker that wouldn't be uninstalled with the extension. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, spoof
systems | linux, ubuntu
advisories | CVE-2021-43536, CVE-2021-43539, CVE-2021-43540, CVE-2021-43541, CVE-2021-43545, CVE-2021-43546
SHA-256 | d44d136059fcda89f1c96e0aa8cb1ab7bc80a28edd13ec2a2a32a862b61d0c3f
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