Email Module Vulnerability in Python Packages: CVE-2023-27043
Summary
UBUNTU-CVE-2023-27043: The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. Affects python2.7 versions < 2.7.6-8ubuntu0.6+esm20. Fixed in 2.7.6-8ubuntu0.6+esm20. How to fix ↓
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Background
Python is a widely-used high-level programming language known for its readability and versatility. It supports multiple programming paradigms and is commonly used for web development, data analysis, artificial intelligence, and more. The email module in Python facilitates the handling of email messages, including parsing and composing. However, a vulnerability has been identified in this module that affects various versions of Python, specifically through 3.11.3.
Vulnerability Detail
The vulnerability arises from improper parsing of email addresses containing special characters within the email module. This flaw allows attackers to bypass security mechanisms that restrict access based on email domain verification. For instance, an application may only allow sign-ups from specific domains (e.g., @company.example.com). Due to this vulnerability, an attacker could exploit the parsing error to gain unauthorized access, potentially leading to data breaches or unauthorized actions within the application.
How To Fix
Minimum fixed version
2.7.6-8ubuntu0.6+esm20
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python2.7Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider implementing additional validation checks on email addresses before processing them within your application. This can help mitigate the risk of exploitation until the package is updated. For example, you can use regular expressions to validate email formats strictly.
Conclusion
The vulnerability identified as CVE-2023-27043 in the Python email module poses a significant risk by allowing attackers to bypass email domain verification. It is crucial for users of affected Python packages to update to the latest patched versions to safeguard their applications. Implementing temporary workarounds can also help mitigate risks until updates are applied.
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FAQ
CVE-2023-27043 is a vulnerability in the email module of Python that allows improper parsing of email addresses, potentially leading to unauthorized access.
The vulnerability affects Python versions through 3.11.3, including various packages like python2.7, python3.5, python3.6, and others.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
The CVSS score of this vulnerability is 5.3, indicating a medium severity level.
If immediate updates are not possible, implement additional validation checks on email addresses to mitigate the risk of exploitation.
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