CVE-2021-23975

Description

The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.

Weakness classification

• CWE-862: Missing Authorization

Primary references

• security@mozilla.org — Issue Tracking, Permissions Required, Vendor Advisory
• security@mozilla.org — Third Party Advisory
• security@mozilla.org — Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Permissions Required, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory