Improper validation of email addresses in Python

1) Input validation error

EUVDB-ID: #VU82980

Risk: Medium

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

CVE-ID: CVE-2023-27043

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass filtration.

The vulnerability exists due to insufficient validation of user-supplied input when parsing email address with a special character. A remote attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain.

Mitigation

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

Vulnerable software versions

Python: 3.11.0 - 3.11.3

CPE2.3

• cpe:2.3:a:python_org:python:3.11.0:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:*:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.11.2:*:*:*:*:*:*:*
• cpe:2.3:a:python_org:python:3.11.3:*:*:*:*:*:*:*

External links

https://github.com/python/cpython/issues/102988
https://python-security.readthedocs.io/vuln/email-parseaddr-realname.html
https://security.netapp.com/advisory/ntap-20230601-0003/

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.