Mozilla Firefox/Firefox ESR/Thunderbird Entity Parser cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in Mozilla Firefox, Firefox ESR and Thunderbird. This vulnerability affects unknown code of the component Entity Parser. Executing a manipulation can lead to cross site scripting. This vulnerability is handled as CVE-2019-11763. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (unknown version). It has been declared as problematic. This vulnerability affects an unknown code block of the component Entity Parser. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The weakness was released 01/08/2020 as Bug 1584216 as not defined bug report (Bugzilla). The advisory is available at bugzilla.mozilla.org. This vulnerability was named CVE-2019-11763 since 05/03/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 248409 (Linux Distros Unpatched Vulnerability : CVE-2019-11763), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (248409). Entries connected to this vulnerability are available at VDB-148427, VDB-148425, VDB-148424 and VDB-148423. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox
• Firefox ESR
• Thunderbird

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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