#VU71642 Incorrect Regular Expression in python-py - CVE-2022-42969

Vulnerability identifier: #VU71642

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-42969

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
python-py
Universal components / Libraries / Libraries used by multiple products

Vendor: pytest-dev

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation in Subversion repository caused by a mishandled InfoSvnCommand argument. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

python-py: 1.0.0 - 1.11.0

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External links
https://github.com/pytest-dev/py/blob/cb87a83960523a2367d0f19226a73aed4ce4291d/py/_path/svnurl.py#L316
https://github.com/pytest-dev/py/issues/287
https://github.com/advisories/GHSA-w596-4wvx-j9j6

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.