psf black up to 24.2.x strings.py lines_with_leading_tabs_expanded redos

Summaryinfo

A vulnerability, which was classified as problematic, was found in psf black up to 24.2.x. This vulnerability affects the function lines_with_leading_tabs_expanded of the file strings.py. The manipulation results in redos. This vulnerability was named CVE-2024-21503. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in psf black up to 24.2.x. Affected is the function lines_with_leading_tabs_expanded of the file strings.py. The manipulation with an unknown input leads to a redos vulnerability. CWE is classifying the issue as CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. This is going to have an impact on availability. CVE summarizes:

Versions of the package black before 24.3.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the lines_with_leading_tabs_expanded function in the strings.py file. An attacker could exploit this vulnerability by crafting a malicious input that causes a denial of service. Exploiting this vulnerability is possible when running Black on untrusted input, or if you habitually put thousands of leading tab characters in your docstrings.

The advisory is available at github.com. This vulnerability is traded as CVE-2024-21503 since 12/22/2023. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1449.003 by the MITRE ATT&CK project.

Upgrading to version 24.3.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch f00093672628d212b8965a8993cee8bedf5fe9b8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• psf

Name

• black

Version

• 24.0
• 24.1
• 24.2

License

• open-source

Website

• Product: https://github.com/psf/black/

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CPE 2.2info

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