CVE-2019-17020 Information

Description

If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet the Content Security Policy will not be applied to the contents of the XSL stylesheet. If the XSL sheet e.g. includes JavaScript it would bypass any of the restrictions of the Content Security Policy applied to the XML document. This vulnerability affects Firefox 72.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1597645 https://usn.ubuntu.com/4234-1/ https://www.mozilla.org/security/advisories/mfsa2020-01/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5