Cross-Site Scripting Vulnerability in Python 2.7's SimpleHTTPServer Package
Summary
DEBIAN-CVE-2011-4940: The list_directory function in Lib/SimpleHTTPServer.py in SimpleHTTPServer in Python before 2.5.6c1, 2.6.x before 2.6.7 rc2, and 2.7.x before 2.7.2 does not place a charset parameter in the Content-Type HTTP header, whic... Affects python2.7 versions < 2.7.2-8. Fixed in 2.7.2-8. How to fix ↓
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Background
Python 2.7 is a widely-used programming language known for its simplicity and readability. The SimpleHTTPServer module allows users to quickly set up a basic web server to serve files over HTTP. However, a vulnerability in the list_directory function can expose users to cross-site scripting (XSS) attacks, particularly affecting Internet Explorer 7.
Vulnerability Detail
The vulnerability arises from the lack of a charset parameter in the Content-Type HTTP header in the list_directory function of SimpleHTTPServer. This omission makes it easier for remote attackers to exploit the server through crafted UTF-7 encoded requests, leading to potential XSS attacks. This issue affects versions of Python prior to 2.7.2, making it critical for users to be aware of the risks associated with running outdated versions.
How To Fix
Minimum fixed version
2.7.2-8
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 implement additional input validation and sanitization on the server-side to mitigate the risk of XSS attacks until the package is updated.
Conclusion
The vulnerability in Python 2.7's SimpleHTTPServer poses significant risks, particularly for users running outdated versions. It is crucial to update to the patched version to safeguard against potential XSS attacks. Users are encouraged to utilize tools like Vulert for real-time monitoring of open-source vulnerabilities.
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FAQ
The vulnerability allows for cross-site scripting (XSS) attacks due to the absence of a charset parameter in the Content-Type HTTP header.
Versions of Python before 2.7.2 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to unauthorized script execution in the context of the user's browser, potentially compromising sensitive data.
Yes, implementing input validation and sanitization can help reduce the risk of XSS attacks until you can apply the necessary updates.
References
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