Mozilla Firefox up to 71.x Content Security Policy XML Document input validation

Summaryinfo

A vulnerability has been found in Mozilla Firefox up to 71.x and classified as critical. Affected by this vulnerability is an unknown functionality of the component Content Security Policy. The manipulation as part of XML Document leads to input validation. This vulnerability is referenced as CVE-2019-17020. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 71.x (Web Browser). It has been rated as critical. This issue affects an unknown part of the component Content Security Policy. The manipulation as part of a XML Document leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published 01/08/2020 as MFSA 2020-01 as confirmed security advisory (Website). The advisory is shared at mozilla.org. The identification of this vulnerability is CVE-2019-17020 since 09/30/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/09/2020).

Upgrading to version 72.0 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Similar entries are available at VDB-148440, VDB-148441, VDB-148442 and VDB-148443. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 71.x

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 the best quality for vulnerability data then you always have to consider VulDB.

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