CVE-2024-9427 in Koji
Summary
by MITRE • 12/24/2024
A vulnerability in Koji was found. An unsanitized input allows for an XSS attack. Javascript code from a malicious link could be reflected in the resulting web page. It is not expected to be able to submit an action or make a change in Koji due to existing XSS protections in the code
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Analysis
by VulDB Data Team • 08/31/2025
CVE-2024-9427 represents a cross-site scripting vulnerability within the Koji build system that poses significant security risks to organizations relying on this infrastructure. This vulnerability stems from insufficient input sanitization mechanisms that fail to properly validate and escape user-supplied data before rendering it within web pages. The flaw specifically allows malicious actors to inject javascript code through crafted links that, when clicked by unsuspecting users, gets reflected in the application's response, creating a persistent XSS vector.
The technical nature of this vulnerability places it squarely within the scope of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security. This classification indicates that the application fails to properly sanitize user input before incorporating it into dynamically generated web content. The vulnerability affects the Koji system's web interface where user-provided parameters are not adequately filtered or escaped, creating opportunities for attackers to execute malicious scripts in the context of authenticated users' browsers. The reflected nature of this XSS attack means that malicious payloads are immediately executed when users navigate to specially crafted URLs containing the exploit code.
The operational impact of CVE-2024-9427 extends beyond simple script execution, as it could potentially enable attackers to escalate privileges or access sensitive build artifacts and system information. While the vulnerability description notes that full system compromise is not expected due to existing XSS protections, the presence of any reflective XSS vector creates opportunities for session hijacking, credential theft, and privilege escalation attacks. Attackers could leverage this vulnerability to steal user sessions, modify build configurations, or access confidential information stored within the Koji environment. The attack surface is particularly concerning given that Koji systems often handle sensitive build processes and may contain proprietary code, configuration files, and access credentials.
Mitigation strategies for CVE-2024-9427 should focus on implementing robust input validation and output encoding mechanisms throughout the Koji application. Organizations should ensure that all user-supplied input is properly sanitized and that all dynamic content is appropriately escaped before being rendered in web pages. This includes implementing Content Security Policy headers, utilizing proper HTML encoding for all dynamic content, and implementing comprehensive input validation at multiple layers of the application stack. The solution aligns with ATT&CK technique T1203 - Exploitation for Client Execution, which emphasizes the importance of preventing reflective XSS attacks through proper input sanitization. Additionally, organizations should consider implementing web application firewalls, conducting regular security assessments, and ensuring that all Koji instances are updated with the latest security patches to prevent exploitation of this vulnerability.