5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-27043

CVE-2023-27043: The e-mail module of Python 0 - 2.7.18, 3.x - 3.11 incorrectly parses e-mail addresses which...

The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-27043

CVE-2023-27043:

5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability CVE-2023-27043 concerns incorrect parsing of email addresses with special characters in Python's email module. The provided issue description (https://github.com/python/cpython/issues/102988) explicitly mentions email.utils.parseaddr() and email.utils.getaddresses() as the affected functions. The commit d45802b6148287204173adde40f787dda28e18c9 directly modifies these two functions in Lib/email/utils.py by adding validation logic (_pre_parse_validation and _post_parse_validation) around the call to _AddressList (which is email._parseaddr.AddressList). This indicates that these public-facing functions were the entry points for the vulnerability, as they previously returned the potentially misparsed results from _AddressList without adequate checks. The vulnerability was that these functions could be tricked into returning the 'real name' part of an address as the 'email address' part. The patches ensure that the output is validated before being returned, thus fixing the vulnerability within these functions.

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WAF Rule

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Reasoning

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