CVE-2017-7820 Affecting firefox package, versions <56.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.4% (74th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-FIREFOX-423797
  • published11 Jun 2018
  • disclosed11 Jun 2018

Introduced: 11 Jun 2018

CVE-2017-7820  (opens in a new tab)

How to fix?

Upgrade Debian:unstable firefox to version 56.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.