Directory Traversal Vulnerability in Python 2.7: CGIHTTPServer Module Exploit
Summary
DEBIAN-CVE-2014-4650: The CGIHTTPServer module in Python 2.7.5 and 3.3.4 does not properly handle URLs in which URL encoding is used for path separators, which allows remote attackers to read script source code or conduct directory traversal... Affects python2.7 versions < 2.7.8-1. Fixed in 2.7.8-1. How to fix ↓
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Background
Python 2.7 is a widely used programming language known for its simplicity and versatility. The CGIHTTPServer module allows for the creation of web servers that can handle Common Gateway Interface (CGI) requests. However, versions 2.7.5 and earlier are susceptible to a critical vulnerability that can be exploited by attackers to access sensitive files and execute unauthorized code.
Vulnerability Detail
The vulnerability arises from improper handling of URL encoding in the CGIHTTPServer module. Specifically, when path separators are encoded (e.g., using %2f), the server fails to correctly interpret these as directory separators. This flaw can lead to directory traversal attacks, allowing remote attackers to read sensitive script source code or execute unintended commands on the server. The vulnerability is present in Python versions 2.7.5 and 3.3.4, making it a significant risk for applications relying on these versions.
How To Fix
Minimum fixed version
2.7.8-1
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, you can restrict access to the CGIHTTPServer module or disable it entirely until the package is updated. Additionally, ensure that your web server is configured to prevent access to sensitive directories and files.
Conclusion
The directory traversal vulnerability in the CGIHTTPServer module of Python 2.7 poses a significant risk to applications using affected versions. It is crucial to update to the patched version to mitigate the risk of unauthorized access and code execution. Implementing workarounds and monitoring tools like Vulert can further enhance security.
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FAQ
The vulnerability allows attackers to perform directory traversal, potentially exposing sensitive files and executing unauthorized code.
Python versions 2.7.5 and 3.3.4 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updates are not possible, consider implementing access restrictions to the CGIHTTPServer module and reviewing your server's security configurations.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
References
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