CVE-2020-35111 Information

Description

When an extension with the proxy permission registered to receive <all_urls> the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs a user opening View Source could have inadvertently leaked their IP address. This vulnerability affects Firefox < 84 Thunderbird < 78.6 and Firefox ESR < 78.6.

CVSS Vector

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

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1657916 https://www.mozilla.org/security/advisories/mfsa2020-54/ https://www.mozilla.org/security/advisories/mfsa2020-55/ https://www.mozilla.org/security/advisories/mfsa2020-56/ When an extension with the proxy permission registered to receive <all_urls> the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs a user opening View Source could have inadvertently leaked their IP address. This vulnerability affects Firefox < 84 Thunderbird < 78.6 and Firefox ESR < 78.6.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

4.3