Vulnerability identifier: #VU80228

Vulnerability risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-40217

CWE-ID: CWE-319

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Python
Universal components / Libraries / Scripting languages

Vendor: Python.org

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error in ssl.SSLSocket implementation when handling TLS client authentication. A remote attacker can trick the application to send data unencrypted.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Python: 3.8.0 - 3.8.17, 3.9.0 - 3.9.17, 3.10.0 - 3.10.12, 3.11.0 - 3.11.4

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External links
http://mail.python.org/archives/list/security-announce@python.org/thread/PEPLII27KYHLF4AK3ZQGKYNCRERG4YXY/
http://docs.python.org/3.11/whatsnew/changelog.html#python-3-11-5-final

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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.