CVE-2016-1000037 in Pagure
Summary
by MITRE
Pagure: XSS possible in file attachment endpoint
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Analysis
by VulDB Data Team • 02/05/2024
The vulnerability identified as CVE-2016-1000037 affects the Pagure project management platform, specifically targeting the file attachment endpoint where cross-site scripting attacks can be executed. This issue represents a critical security flaw that allows attackers to inject malicious scripts into file attachment functionality, potentially compromising user sessions and system integrity. The vulnerability stems from insufficient input validation and output sanitization within the file upload and attachment handling components of the platform.
The technical implementation of this vulnerability occurs when users upload files through the attachment endpoint without proper sanitization of file metadata or content. Attackers can craft malicious file names or metadata containing javascript payloads that execute in the context of other users who view the attachments. This type of vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic case of insufficient output encoding where user-supplied data is directly rendered without proper sanitization. The flaw exists in the server-side processing logic that fails to properly escape or validate special characters in file attachment data before it is stored and subsequently displayed to other users.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling session hijacking, credential theft, and privilege escalation attacks. When users browse file attachments, their browsers execute the injected scripts within the context of the authenticated session, allowing attackers to perform actions on behalf of legitimate users. This could lead to unauthorized access to sensitive project data, modification of file attachments, or even complete system compromise depending on the user's privileges. The attack vector is particularly dangerous because it leverages the trust relationship between users and the system, making detection more challenging. According to ATT&CK framework, this vulnerability maps to T1059.007 for script execution and T1566 for spearphishing with a link, as attackers can craft malicious file attachments to lure users into executing harmful code.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and output sanitization mechanisms throughout the file attachment processing pipeline. The system must validate all file metadata and content against strict whitelists, ensuring that special characters are properly escaped or removed before storage and display. Security patches should enforce proper content type checking and implement Content Security Policy headers to prevent script execution in attachment contexts. Additionally, the platform should implement automatic file scanning for known malicious patterns and establish proper access controls for file attachment functionality. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other endpoints, while user education about suspicious file attachments can provide additional defense layers. The fix should align with OWASP Top Ten security recommendations for preventing cross-site scripting vulnerabilities and should be validated through comprehensive testing to ensure that all user-supplied data is properly sanitized before any rendering occurs in web interfaces.