Critical XML External Entity Injection Vulnerability in Python Packages
Summary
USN-6354-1: python2.7, python3.5 vulnerability. Affects python2.7 versions < 2.7.6-8ubuntu0.6+esm16. Fixed in 2.7.6-8ubuntu0.6+esm16. 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 affected packages, python2.7 and python3.5, are essential components of the Python ecosystem, providing core functionalities and libraries for developers. This vulnerability exposes these packages to potential XML External Entity (XXE) injection attacks, which can lead to severe security issues.
Vulnerability Detail
The vulnerability arises from Python's improper handling of XML entity declarations in plist files. An attacker can exploit this flaw to perform an XML External Entity (XXE) injection, which may result in denial of service or information disclosure. This vulnerability is identified as CVE-2022-48565 and can be particularly dangerous as it allows unauthorized access to sensitive data or system resources.
How To Fix
Minimum fixed version
2.7.6-8ubuntu0.6+esm16
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, users can avoid processing untrusted XML data or disable the XML entity processing feature in their applications until the packages are updated. This can be done by configuring the XML parser to ignore external entities.
Conclusion
In summary, the discovered vulnerability in Python packages python2.7 and python3.5 poses significant risks due to improper handling of XML entity declarations. It is essential to update to the patched versions to safeguard against potential attacks. Users are encouraged to utilize tools like Vulert for real-time monitoring of vulnerabilities in their applications.
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FAQ
XXE injection is a type of attack that exploits vulnerabilities in XML parsers, allowing attackers to interfere with the processing of XML data. This can lead to unauthorized access to files, denial of service, or other malicious actions.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By utilizing the Vulert playground, you can check if your application is affected by this vulnerability without needing to sign up.
The impacts can include unauthorized access to sensitive information, denial of service, and potential exploitation of the system by attackers, leading to further security breaches.
The vulnerability affects specific versions of Python packages, including python2.7 and python3.5. It is recommended to update to the latest patched versions to mitigate the risk.
If immediate updates are not possible, consider implementing workarounds such as avoiding the processing of untrusted XML data or disabling XML entity processing in your applications.
References
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