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CVE-2011-4140 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting Django versions 1.2.7 and earlier, as well as 1.3.x versions up to 1.3.1. This flaw allows remote attackers to execute unauthorized actions on a user's behalf if the web server configuration permits arbitrary HTTP Host headers. The vulnerability stems from inadequate handling of these headers within Django's CSRF protection mechanism, potentially leading to malicious requests being processed as legitimate.
The primary impact of CVE-2011-4140 is the potential for unauthorized actions to be performed on a user's account. An attacker could craft a malicious web page containing JavaScript code that, when visited by an authenticated user, would send a forged request to the Django application. This forged request could modify data, change user settings, or perform other actions that the user would normally authorize. The use of DNS CNAME records adds a layer of complexity, allowing attackers to bypass some security measures by manipulating the hostname used in the request. The blast radius is limited to the actions that can be performed within the Django application itself, but the consequences of those actions could be significant depending on the application's functionality.
CVE-2011-4140 was publicly disclosed on October 19, 2011. While no active exploitation campaigns have been definitively linked to this specific CVE, the general nature of CSRF vulnerabilities makes them a persistent threat. There are no known public proof-of-concept exploits readily available, but the vulnerability is well-understood, and exploitation is theoretically possible. It is not listed on the CISA KEV catalog.
Exploit-Status
EPSS
0.34% (57% Perzentil)
CVSS-Vektor
The recommended mitigation for CVE-2011-4140 is to upgrade to Django version 1.2.7 or later. This version includes a fix that properly handles arbitrary HTTP Host headers, preventing the CSRF vulnerability. If upgrading is not immediately feasible, consider implementing a web server configuration that restricts the allowed HTTP Host headers to prevent attackers from manipulating them. Additionally, ensure that all Django applications are properly configured with CSRF protection enabled. After upgrading, confirm the fix by attempting to trigger a CSRF attack using a tool like Burp Suite or OWASP ZAP and verifying that the request is blocked.
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CVE-2011-4140 is a Cross-Site Request Forgery (CSRF) vulnerability in Django versions 1.2.7 and earlier, and 1.3.x before 1.3.1. It allows attackers to forge requests via DNS CNAME manipulation and JavaScript, potentially leading to unauthorized actions.
You are affected if you are using Django versions 1.2.7 or earlier, or versions 1.3.x before 1.3.1. Check your Django version using python -c 'import django; print(django.get_version())'.
Upgrade to Django version 1.2.7 or later. This version includes the fix for the CSRF vulnerability. If upgrading is not possible, implement WAF rules to filter suspicious requests.
While no active campaigns targeting this specific CVE have been publicly reported, the general nature of CSRF vulnerabilities means they remain a persistent threat. The vulnerability's age increases the likelihood of exploitation.
Refer to the Django security advisory for CVE-2011-4140: https://security.djangoproject.com/advisories/CVE-2011-4140/
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