CVE-2024-55660 in SiYuan
Summary
by MITRE • 12/12/2024
SiYuan is a personal knowledge management system. Prior to version 3.1.16, SiYuan's `/api/template/renderSprig` endpoint is vulnerable to Server-Side Template Injection (SSTI) through the Sprig template engine. Although the engine has limitations, it allows attackers to access environment variables. Version 3.1.16 contains a patch for the issue.
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Analysis
by VulDB Data Team • 06/06/2025
The vulnerability identified as CVE-2024-55660 affects SiYuan, a personal knowledge management system that has gained popularity among users seeking organized digital information storage solutions. This particular flaw resides within the application's template rendering functionality, specifically targeting the `/api/template/renderSprig` endpoint that processes template requests using the Sprig template engine. The issue represents a significant security concern as it exposes the system to server-side template injection attacks that could potentially compromise the entire knowledge management infrastructure.
The technical exploitation of this vulnerability occurs through the Sprig template engine's processing of user-supplied input passed to the renderSprig endpoint. While the Sprig engine itself possesses certain limitations that restrict the full range of template injection capabilities, attackers can still leverage the vulnerability to access environment variables stored within the application's runtime context. This access to environment variables represents a critical information disclosure risk as these variables often contain sensitive configuration data, database connection strings, API keys, and other credentials that could be used to escalate privileges or gain unauthorized access to underlying systems. The vulnerability's classification aligns with CWE-74 and CWE-94, which respectively address injection flaws and code injection vulnerabilities, while the attack vector maps to ATT&CK technique T1059.008 for server-side template injection.
The operational impact of this vulnerability extends beyond simple information disclosure, as successful exploitation could enable attackers to execute arbitrary code on the server hosting the SiYuan application. This capability arises from the ability to manipulate template processing logic and potentially inject malicious template code that executes within the server's context. The vulnerability affects all versions prior to 3.1.16, meaning users operating older versions remain at risk of compromise. Given that SiYuan is designed for personal knowledge management, users may store sensitive personal information, work-related documents, and confidential data within the system, making the potential damage from exploitation particularly severe for individual users and organizations relying on the platform. The vulnerability's impact is exacerbated by the fact that it operates at the server level, potentially allowing attackers to access the entire knowledge base and associated data without requiring additional authentication or privilege escalation.
The remediation for this vulnerability involves updating to SiYuan version 3.1.16 or later, which includes a patch specifically designed to address the template injection flaw. Security administrators should prioritize this update across all affected systems and conduct thorough testing to ensure the patch does not introduce compatibility issues with existing templates or workflows. Organizations should also implement monitoring procedures to detect potential exploitation attempts targeting this endpoint and consider implementing web application firewalls or other protective measures. The vulnerability's resolution demonstrates the importance of maintaining up-to-date software versions and highlights the need for regular security assessments of template processing components within web applications. Security teams should review their incident response procedures to address potential exploitation attempts and ensure proper logging and alerting mechanisms are in place to detect unauthorized access attempts to template rendering endpoints.