Cross-site Scripting (XSS) Affecting firefox package, versions <0:68.2.0-1.el7_7


Severity

Recommended
critical

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.15% (52nd percentile)

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  • Snyk IDSNYK-RHEL7-FIREFOX-4927205
  • published26 Jul 2021
  • disclosed22 Oct 2019

Introduced: 22 Oct 2019

CVE-2019-11763  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade RHEL:7 firefox to version 0:68.2.0-1.el7_7 or higher.
This issue was patched in RHSA-2019:3193.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVSS Scores

version 3.1