CVE-2009-2659 in Django
Summary
by MITRE
The Admin media handler in core/servers/basehttp.py in Django 1.0 and 0.96 does not properly map URL requests to expected "static media files," which allows remote attackers to conduct directory traversal attacks and read arbitrary files via a crafted URL.
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Analysis
by VulDB Data Team • 08/13/2021
The vulnerability identified as CVE-2009-2659 represents a critical directory traversal flaw within the Django web framework's administrative media handler. This issue affects versions 1.0 and 0.96 of the Django framework, where the core/servers/basehttp.py module fails to properly validate and sanitize URL requests intended for static media file access. The flaw stems from inadequate input validation mechanisms that allow malicious actors to manipulate URL parameters and navigate beyond the intended directory structure, thereby gaining unauthorized access to arbitrary files on the server filesystem.
The technical implementation of this vulnerability exploits the weak sanitization of file paths within Django's administrative interface. When users access media files through the admin interface, the system processes URL requests without sufficient validation of the requested file paths. Attackers can craft malicious URLs containing sequences such as ../ or ..\ that traverse parent directories, ultimately enabling them to access sensitive files including configuration files, database credentials, source code, and other confidential data stored outside the designated media directories. This type of vulnerability directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of CVE-2009-2659 extends beyond simple unauthorized file access, as it provides attackers with potential pathways to escalate privileges and compromise entire server environments. Remote attackers can leverage this vulnerability to extract sensitive information, potentially leading to complete system compromise. The attack vector is particularly dangerous because it operates through the standard HTTP protocol, requiring no special authentication or privileged access. This vulnerability can be exploited by attackers who simply need to know the general structure of the web application's directory layout to craft effective traversal sequences. The flaw affects not only the Django administrative interface but also potentially exposes underlying server configurations and application code that might be stored in accessible locations.
Organizations using affected Django versions face significant security risks that require immediate attention and remediation. The vulnerability demonstrates a fundamental flaw in input validation and access control mechanisms within web application frameworks. Security practitioners should implement multiple layers of defense including web application firewalls, proper input validation, and strict file access controls. The mitigation strategy involves upgrading to patched versions of Django where the URL path validation has been strengthened to prevent directory traversal attempts. Additionally, administrators should consider implementing restrictive file permissions, limiting the exposure of sensitive files, and conducting thorough security audits of all web application components to identify similar vulnerabilities. This incident aligns with ATT&CK technique T1083, which describes the discovery of system information through directory traversal and file enumeration techniques, highlighting the importance of proper access controls and input validation in preventing such reconnaissance activities.