Django Host Header Vulnerability in python-django: Arbitrary URL Generation
Summary
CVE-2012-4520: The django.http.HttpRequest.get_host function in Django 1.3.x before 1.3.4 and 1.4.x before 1.4.2 allows remote attackers to generate and display arbitrary URLs via crafted username and password Host header values. Affects python-django versions < 1.4.2-1. Fixed in 1.4.2-1. How to fix ↓
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Background
Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It provides a robust set of features for building web applications, including an ORM, authentication, and URL routing. However, certain versions of Django are vulnerable to a host header attack, which can lead to the generation and display of arbitrary URLs, potentially compromising the security of web applications built on this framework.
Vulnerability Detail
The vulnerability, identified as CVE-2012-4520, affects the django.http.HttpRequest.get_host function in Django versions 1.3.x before 1.3.4 and 1.4.x before 1.4.2. It allows remote attackers to manipulate the Host header values in crafted username and password requests, leading to the generation of arbitrary URLs. This can result in phishing attacks or the exposure of sensitive information, as attackers can control the URL displayed to users.
How To Fix
Minimum fixed version
1.4.2-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-djangoTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If an immediate upgrade is not possible, consider implementing a reverse proxy that sanitizes the Host header before it reaches your Django application. This can help mitigate the risk of arbitrary URL generation while you plan for an upgrade.
Conclusion
The CVE-2012-4520 vulnerability in Django poses significant risks to web applications by allowing attackers to manipulate Host headers. It is crucial to upgrade to a secure version of python-django to protect against these threats. Additionally, utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2012-4520 is a vulnerability in certain versions of Django that allows attackers to generate arbitrary URLs by manipulating the Host header.
Django versions 1.3.x before 1.3.4 and 1.4.x before 1.4.2 are affected by this vulnerability.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application against this vulnerability using the Vulert playground without any signup.
The risks include phishing attacks, exposure of sensitive information, and the possibility of users being misled by arbitrary URLs.
Yes, implementing a reverse proxy that sanitizes the Host header can help mitigate the risk until an upgrade can be performed.
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