Origin Validation Error Affecting firefox package, versions <87.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.15% (52nd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-FIREFOX-1088408
  • published24 Mar 2021
  • disclosed31 Mar 2021

Introduced: 24 Mar 2021

CVE-2021-23986  (opens in a new tab)
CWE-346  (opens in a new tab)

How to fix?

Upgrade Debian:unstable firefox to version 87.0-1 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.

A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.

CVSS Scores

version 3.1