CVE-2020-6821 Information

Description

When reading from areas partially or fully outside the source resource with WebGL’s codecopyTexSubImage/code method the specification requires the returned values be zero. Previously this memory was uninitialized leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird 68.7.0 Firefox ESR 68.7 and Firefox 75.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1625404 https://usn.ubuntu.com/4335-1/ https://www.mozilla.org/security/advisories/mfsa2020-12/ https://www.mozilla.org/security/advisories/mfsa2020-13/ https://www.mozilla.org/security/advisories/mfsa2020-14/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5