CVE-2014-3994 in djblets
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in util/templatetags/djblets_js.py in Djblets before 0.7.30 and 0.8.x before 0.8.3 for Django, as used in Review Board, allows remote attackers to inject arbitrary web script or HTML via a JSON object, as demonstrated by the name field when changing a user name.
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Analysis
by VulDB Data Team • 12/16/2024
The CVE-2014-3994 vulnerability represents a critical cross-site scripting flaw within the Djblets JavaScript template tag module, specifically in the djblets_js.py file. This vulnerability affects versions of Djblets prior to 0.7.30 and 0.8.x prior to 0.8.3, which are commonly integrated into the Review Board code review platform. The flaw arises from insufficient input validation and sanitization mechanisms when processing JSON objects containing user-provided data, creating a persistent vector for malicious script injection attacks. The vulnerability manifests when users modify their account names through the web interface, making it particularly dangerous as it operates within legitimate user interaction contexts.
The technical implementation of this vulnerability stems from improper handling of user-supplied data within the Django template system's JavaScript generation capabilities. When the system processes a JSON object containing a name field during user profile updates, the djblets_js.py module fails to adequately sanitize or escape the input before incorporating it into generated JavaScript code. This lack of proper input sanitization creates an environment where attackers can inject malicious JavaScript payloads that execute in the context of other users' browsers. The vulnerability is classified as a classic reflected XSS issue, though it operates through a more complex data flow involving JSON processing and template generation. According to CWE-79, this represents a weakness in the web application's input handling, specifically failing to properly escape dynamic content.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to hijack user sessions, steal sensitive information, or manipulate the Review Board interface. Since Review Board is commonly used for code review processes within organizations, an attacker could exploit this vulnerability to access confidential code changes, manipulate review comments, or even escalate privileges within the system. The attack vector requires minimal user interaction, as the vulnerability is triggered during normal user profile modifications, making it particularly dangerous in environments where users regularly update their information. This vulnerability aligns with ATT&CK technique T1531, which involves modifying existing programs or scripts to gain unauthorized access or execute malicious code.
Mitigation strategies for CVE-2014-3994 involve immediate patching of affected Djblets versions to 0.7.30 or 0.8.3, respectively, which contain proper input sanitization mechanisms. Organizations should implement comprehensive input validation at multiple layers, including client-side and server-side sanitization of all user-provided data before processing. The implementation of Content Security Policy headers can provide additional defense-in-depth measures, preventing execution of unauthorized scripts even if the primary vulnerability is exploited. Security teams should conduct thorough code reviews focusing on template tag implementations and JSON processing functions to identify similar vulnerabilities. Regular security assessments and vulnerability scanning should include checks for improper input handling in web application frameworks, particularly in Django-based systems where template tag processing occurs. The remediation process should also involve user education regarding the importance of keeping software updated and the potential risks of modifying system components without proper validation.