CVE-2021-29987 Information

Description

After requesting multiple permissions and closing the first permission panel subsequent permission panels will be displayed in a different position but still record a click in the default location making it possible to trick a user into accepting a permission they did not want to. This bug only affects Firefox on Linux. Other operating systems are unaffected.. This vulnerability affects Firefox < 91 and Thunderbird < 91.

CVSS Vector

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

Reference

https://www.mozilla.org/security/advisories/mfsa2021-33/ https://www.mozilla.org/security/advisories/mfsa2021-36/ https://bugzilla.mozilla.org/show_bug.cgi?id=1716129 https://security.gentoo.org/glsa/202202-03

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5