CVE-2011-0697 in Django
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Django 1.1.x before 1.1.4 and 1.2.x before 1.2.5 might allow remote attackers to inject arbitrary web script or HTML via a filename associated with a file upload.
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Analysis
by VulDB Data Team • 10/17/2021
The vulnerability identified as CVE-2011-0697 represents a cross-site scripting flaw within the Django web framework that affects versions prior to 1.1.4 and 1.2.5. This issue arises from insufficient input validation during file upload processing, creating a pathway for malicious actors to execute arbitrary web scripts or HTML code within the context of affected applications. The vulnerability specifically targets the handling of filenames associated with uploaded files, making it particularly concerning for web applications that permit user file uploads. The flaw resides in the framework's inability to properly sanitize or escape special characters present in uploaded filenames, which can then be rendered in web pages without adequate security measures. This type of vulnerability falls under the CWE-79 category of Cross-site Scripting, which is classified as a critical weakness in web application security. The issue demonstrates how seemingly benign functionality like file uploads can become attack vectors when proper security controls are not implemented.
The technical exploitation of this vulnerability occurs when an attacker uploads a file with a malicious filename containing script tags or other HTML/JavaScript code. When the application displays this filename in web pages, the malicious code executes in the context of other users who view the page containing the uploaded file information. This creates a persistent XSS attack vector that can affect multiple users who interact with the vulnerable application. The attack typically involves crafting a filename that includes malicious payload such as <script>alert('xss')</script> or other JavaScript code that gets executed when the filename is rendered on web pages. The vulnerability is particularly dangerous because it leverages legitimate file upload functionality, making it harder to detect and prevent compared to direct injection attempts. The flaw demonstrates the importance of input sanitization at multiple levels within web applications, as the issue occurs during the processing of user-supplied data rather than during direct user input handling.
The operational impact of CVE-2011-0697 extends beyond simple script execution, potentially enabling attackers to perform session hijacking, deface websites, steal sensitive user information, or redirect users to malicious sites. When exploited, this vulnerability can compromise the integrity of web applications and the privacy of users who interact with affected systems. The attack surface is broad as any Django application that allows file uploads and displays filenames in web pages is potentially vulnerable. Organizations using affected Django versions face significant security risks, particularly those handling sensitive user data or operating in environments where user trust is paramount. The vulnerability also has implications for web application security posture, as it highlights the need for comprehensive security testing that includes file handling scenarios. From an attacker's perspective, this vulnerability provides a relatively easy method to compromise web applications, as it requires minimal technical expertise and can be automated using existing attack frameworks. The impact is further amplified by the fact that Django is widely used, making this vulnerability potentially exploitable across numerous web applications and organizations.
Organizations should immediately upgrade to Django versions 1.1.4 or 1.2.5 or later to remediate this vulnerability, as these releases contain the necessary patches to address the filename sanitization issues. Additional mitigations include implementing proper input validation for all uploaded filenames, employing content security policies to limit script execution, and using web application firewalls to detect and block malicious payloads. Security teams should conduct thorough vulnerability assessments of their Django applications to identify any custom code that might be susceptible to similar issues, particularly code that handles file uploads or displays user-supplied data. The vulnerability also underscores the importance of following secure coding practices and implementing defense-in-depth strategies that include multiple layers of security controls. Organizations should also consider implementing automated security testing that includes file upload scenarios and regular security audits to prevent similar vulnerabilities from emerging in the future. The incident serves as a reminder of the critical importance of keeping web frameworks updated and maintaining comprehensive security monitoring practices to detect and respond to potential exploitation attempts. This vulnerability aligns with ATT&CK technique T1059.007 for scripting and T1566.001 for malicious file execution, demonstrating how application-level vulnerabilities can enable broader attack chains within target environments.