CVE-2023-36632 : The legacy email.utils.parseaddr function in Python through 3.11.4 allows attack

The legacy email.utils.parseaddr function in Python through 3.11.4 allows attackers to trigger "RecursionError: maximum recursion depth exceeded while calling a Python object" via a crafted argument. This argument is plausibly an untrusted value from an application's input data that was supposed to contain a name and an e-mail address. NOTE: email.utils.parseaddr is categorized as a Legacy API in the documentation of the Python email package. Applications should instead use the email.parser.BytesParser or email.parser.Parser class. NOTE: the vendor's perspective is that this is neither a vulnerability nor a bug. The email package is intended to have size limits and to throw an exception when limits are exceeded; they were exceeded by the example demonstration code.

Published 2023-06-25 18:15:09

Updated 2024-08-02 17:16:13

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2023-36632

Python » Python
Versions up to, including, (<=) 3.11.4
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2023-36632

Top countries where our scanners detected CVE-2023-36632

Top open port discovered on systems with this issue 80

IPs affected by CVE-2023-36632 315,795

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2023-36632!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2023-36632

EPSS FAQ

0.08%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 25 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-36632

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2023-36632

CWE-674 Uncontrolled Recursion

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-36632

https://docs.python.org/3/library/email.html

email — An email and MIME handling package — Python 3.11.4 documentation
Product
https://github.com/python/cpython/issues/103800

RecursionError in email.utils.parseaddr · Issue #103800 · python/cpython · GitHub
Exploit;Issue Tracking
https://github.com/Daybreak2019/PoC_python3.9_Vul/blob/main/RecursionError-email.utils.parseaddr.py

PoC_python3.9_Vul/RecursionError-email.utils.parseaddr.py at main · Daybreak2019/PoC_python3.9_Vul · GitHub
Product
https://docs.python.org/3/library/email.utils.html

email.utils: Miscellaneous utilities — Python 3.11.4 documentation
Product