CVE-2017-7820

Publication date 2 October 2017

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
firefox	18.04 LTS bionic	Fixed 56.0+build6-0ubuntu1
	17.10 artful	Fixed 56.0+build6-0ubuntu1
	17.04 zesty	Fixed 56.0+build6-0ubuntu0.17.04.1
	16.04 LTS xenial	Fixed 56.0+build6-0ubuntu0.16.04.1
	14.04 LTS trusty	Fixed 56.0+build6-0ubuntu0.14.04.1

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Related Ubuntu Security Notices (USN)