SB2020111727 - Permissions, Privileges, and Access Controls in firefox-esr (Alpine package)
Published: November 17, 2020
Security Bulletin ID
SB2020111727
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-26958)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due Firefox does not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. A remote attacker can exploit this behavior to perform a cross-site script inclusion vulnerability or bypass implemented Content Security Policy restrictions.
Remediation
Install update from vendor's website.