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Showdownjs Denial of Service

Medium

Synopsis

A researcher at Tenable discovered an issue in the Showdownjs NPM package which could lead to a denial of service. Showndownjs' anchors subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input. 

Proof of Concept:

# Run the time command with node, containing the vulnerable regex expression
time node -e '/\[((?:\[[^\]]*]|[^\[\]])*)] ?(?:\n *)?\[(.*?)]()()()()/g.test("[[[[[[[[[".repeat(9999))'

 

 

 

 

Disclosure Timeline

January 11, 2024 - Tenable makes the first attempt to contact the vendor.
January 26, 2024 - Tenable make a second attempt to contact the vendor.
February 2, 2024 - Tenable makes final contact attempt.
February 26, 2024 - Tenable releases advisory in accordance with their disclosure policy.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2024-1899
Tenable Advisory ID: TRA-2024-05
Credit:
Shay Yaish
CVSSv3 Base / Temporal Score:
5.3
CVSSv3 Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Products:
Showdownjs
Risk Factor:
Medium

Advisory Timeline

26 February 2024 - Initial Advisory Released