Critical Vulnerability in Python2.7: Regression and Denial of Service Risks
Summary
USN-7015-7: python2.7 regression. Affects python2.7 versions < 2.7.12-1ubuntu0~16.04.18+esm18. Fixed in 2.7.12-1ubuntu0~16.04.18+esm18. How to fix ↓
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Background
Python2.7 is a widely used programming language known for its simplicity and versatility in various applications, including web development, data analysis, and automation. Despite its popularity, Python2.7 has been subject to vulnerabilities that can compromise its security and functionality. This particular vulnerability affects the email module and other components, allowing attackers to exploit weaknesses in email parsing and resource management.
Vulnerability Detail
The vulnerability arises from multiple issues in the Python email module and other components. It was discovered that the email module incorrectly parsed email addresses with special characters, potentially allowing attackers to bypass security mechanisms. Additionally, excessive backtracking in tarfile header parsing could lead to denial of service by consuming resources. Other issues include improper handling of newlines in email headers, incorrect cookie parsing, and mishandling of malformed zip files, all of which could result in denial of service attacks.
How To Fix
Minimum fixed version
2.7.12-1ubuntu0~16.04.18+esm18
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
If immediate patching is not feasible, consider disabling the affected modules or restricting their use until the update can be applied. This may involve modifying application configurations to avoid using the vulnerable features.
Conclusion
In summary, the recent vulnerabilities discovered in Python2.7 pose significant risks, including denial of service and security bypass. It is crucial for users to update to the latest patched versions to mitigate these risks. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for python2.7 →
FAQ
The vulnerability involves multiple issues in the email module and other components that can lead to denial of service and security bypass.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without signup.
The risks include potential denial of service attacks and the ability for attackers to bypass security mechanisms, leading to unauthorized access or data breaches.
Yes, updating to the patched versions of Python2.7 provided by Ubuntu will permanently fix the vulnerability.
If you cannot update immediately, consider disabling the affected modules or restricting their use until you can apply the patch.
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