#VU46964 Cross-site scripting


Published: 2020-09-23

Vulnerability identifier: #VU46964

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-15676

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 80.0.1

Firefox ESR: 78.0 - 78.2.0, 68.0 - 68.12.0, 60.0 - 60.9.0


CPE

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-42/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-43/


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


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