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Ubuntu: (Multiple Advisories) (CVE-2017-7820): Firefox regression

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Ubuntu: (Multiple Advisories) (CVE-2017-7820): Firefox regression

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
09/28/2017
Created
07/25/2018
Added
10/03/2017
Modified
03/02/2020

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.

Solution(s)

  • ubuntu-upgrade-firefox

References

  • USN-3435-1
  • USN-3435-2
  • CVE-2017-7820

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