CVE-2017-7820

MEDIUM

Description

The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element. This vulnerability affects Firefox < 56.

References

http://www.securityfocus.com/bid/101057

http://www.securitytracker.com/id/1039465

https://bugzilla.mozilla.org/show_bug.cgi?id=1378207

https://www.mozilla.org/security/advisories/mfsa2017-21/

Details

Source: MITRE

Published: 2018-06-11

Updated: 2019-10-03

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Impact Score: 1.4

Exploitability Score: 3.9

Severity: MEDIUM