HTTP_PROXY Variable Name Clash Vulnerability in Python 2.7
Summary
DEBIAN-CVE-2016-1000110: The CGIHandler class in Python before 2.7.12 does not protect against the HTTP_PROXY variable name clash in a CGI script, which could allow a remote attacker to redirect HTTP requests. Affects python2.7 versions < 2.7.12-2. Fixed in 2.7.12-2. How to fix ↓
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Background
Python 2.7 is a widely used programming language known for its simplicity and versatility. It supports various programming paradigms and is commonly utilized for web development, data analysis, artificial intelligence, and more. However, prior to version 2.7.12, the CGIHandler class in Python 2.7 had a significant vulnerability that allowed for potential HTTP request redirection due to improper handling of the HTTP_PROXY variable in CGI scripts.
Vulnerability Detail
The vulnerability arises from the CGIHandler class in Python versions before 2.7.12, which fails to adequately protect against conflicts with the HTTP_PROXY environment variable. This oversight can be exploited by a remote attacker, who could manipulate HTTP requests, potentially redirecting them to malicious sites. The implications of this vulnerability are severe, as it could lead to unauthorized access to sensitive data or further exploitation of the affected system.
How To Fix
Minimum fixed version
2.7.12-2
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 using CGI scripts that rely on the HTTP_PROXY variable until the package is updated. Additionally, configuring the web server to restrict access to CGI scripts may help mitigate the risk.
Conclusion
The HTTP_PROXY variable name clash vulnerability in Python 2.7 poses a significant risk, allowing remote attackers to redirect HTTP requests. It is crucial for users to update to the patched version to safeguard their applications. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
The vulnerability allows remote attackers to redirect HTTP requests due to a clash with the HTTP_PROXY variable in CGI scripts.
Python versions prior to 2.7.12 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 could lead to unauthorized access to sensitive data and further compromise of the affected system.
Yes, updating to Python version 2.7.12-2 or later is the permanent fix for this vulnerability.
References
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