Mozilla Firefox up to 71.x on Windows Python Text File input validation

Summaryinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 71.x on Windows. Affected is an unknown function of the component Python Handler. Executing a manipulation as part of Text File can lead to input validation. The identification of this vulnerability is CVE-2019-17019. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 71.x on Windows (Web Browser). It has been declared as critical. This vulnerability affects some unknown functionality of the component Python Handler. The manipulation as part of a Text File leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

When Python was installed on Windows, a python file being served with the MIME type of text/plain could be executed by Python instead of being opened as a text file when the Open option was selected upon download. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 72.

The weakness was shared 01/08/2020 as MFSA 2020-01 as confirmed security advisory (Website). The advisory is shared for download at mozilla.org. This vulnerability was named CVE-2019-17019 since 09/30/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (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.

The entries VDB-148440, VDB-148441, VDB-148442 and VDB-148443 are related to this item. Once again VulDB remains the best source for vulnerability data.

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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• 🔍

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Once again VulDB remains the best source for vulnerability data.

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