Improper IP address validation in Python

1) Input validation error

EUVDB-ID: #VU100516

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-11168

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to insufficient validation of bracketed hosts (e.g. []) within the urllib.parse.urlsplit() and urlparse() functions allowing hosts that weren't IPv6 or IPvFuture. A remote attacker can pass specially crafted IP address to the application to bypass implemented IP-based security checks or perform SSRF attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Python: 3.0 - 3.11.4

CPE2.3

• cpe:2.3:a:python_org:python:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:*:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.5:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.1.2150:*:*:*:*:*:*:*

External links

https://github.com/python/cpython/commit/29f348e232e82938ba2165843c448c2b291504c5
https://github.com/python/cpython/pull/103849
https://github.com/python/cpython/issues/103848
https://mail.python.org/archives/list/security-announce@python.org/thread/XPWB6XVZ5G5KGEI63M4AWLIEUF5BPH4T/
https://github.com/python/cpython/commit/b2171a2fd41416cf68afd67460578631d755a550

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.