Rapid7 Vulnerability & Exploit Database

Ubuntu: USN-4893-1 (CVE-2021-23986): Firefox vulnerabilities

Back to Search

Ubuntu: USN-4893-1 (CVE-2021-23986): Firefox vulnerabilities

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
03/25/2021
Created
03/30/2021
Added
03/26/2021
Modified
06/26/2021

Description

A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.

Solution(s)

  • ubuntu-upgrade-firefox

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;