N/A

CVSS Score

-

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Basic Information

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CVE-2023-36632

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

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.

(GitHub Advisory)

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CVE-2023-36632

CVE-2023-36632:

N/A

CVSS Score

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability CVE-2023-36632 describes a recursion error in email.utils.parseaddr. No specific patch commit is available as the vendor disputes the issue as a vulnerability, considering it an intentional behavior when input limits are exceeded. However, the task is to identify functions that appear in a runtime profile when the described behavior (recursion error) is triggered. The analysis is based on the traceback provided in the GitHub issue python/cpython#103800, which was referenced in the NVD entry for CVE-2023-36632. This traceback clearly shows the call stack: email.utils.parseaddr calls internal methods of email._parseaddr._AddressList, specifically __init__, getaddrlist, and finally getaddress, where the unbounded recursion occurs. These functions would therefore appear in a runtime profile or stack trace when the recursion error is triggered by a crafted input. The PoC URL provided was inaccessible (404 error).

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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