CVE-2018-13289 in Router Manager
Summary
by MITRE
Information exposure vulnerability in SYNO.FolderSharing.List in Synology Router Manager (SRM) before 1.1.7-6941-2 allows remote attackers to obtain sensitive information via the (1) folder_path or (2) real_path parameter.
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Analysis
by VulDB Data Team • 08/21/2023
The vulnerability identified as CVE-2018-13289 represents a critical information exposure flaw within Synology Router Manager (SRM) version 1.1.7-6941-2 and earlier releases. This vulnerability specifically affects the SYNO.FolderSharing.List API endpoint which is designed to handle folder sharing operations within the router management interface. The flaw enables remote attackers to extract sensitive information by manipulating two distinct parameters: folder_path and real_path, both of which are processed without adequate input validation or access control mechanisms.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input parameters within the SYNO.FolderSharing.List API method. When remote attackers submit crafted requests containing malicious folder_path or real_path values, the system fails to properly validate or restrict access to sensitive file system paths. This weakness allows unauthorized access to directory listings and potentially sensitive file information that should remain restricted to authorized users only. The vulnerability operates at the application layer and can be exploited through network-based attacks without requiring authentication credentials, making it particularly dangerous in environments where SRM is exposed to untrusted networks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with detailed insights into the router's file system structure and potentially sensitive organizational data. An attacker could leverage this information to map network shares, identify critical system files, or discover other vulnerabilities within the router's configuration. The exposure of folder paths and real paths may reveal internal network structures, user directories, and potentially sensitive configuration files that could be used for further exploitation. This vulnerability directly violates principles of least privilege and information hiding, creating opportunities for lateral movement and privilege escalation attacks.
Mitigation strategies for CVE-2018-13289 should prioritize immediate patching of affected SRM installations to version 1.1.7-6941-2 or later, which includes proper input validation and access control mechanisms. Network segmentation should be implemented to restrict access to SRM interfaces, particularly when exposed to public networks or untrusted environments. Organizations should deploy web application firewalls to monitor and filter API requests, specifically targeting the SYNO.FolderSharing.List endpoint. Additionally, regular security assessments should be conducted to identify similar information exposure vulnerabilities within other network management systems. This vulnerability aligns with CWE-200, Information Exposure, and maps to ATT&CK technique T1213.002, Data from Information Repositories, highlighting the need for comprehensive access control and input validation measures. Organizations should also implement monitoring solutions to detect unusual API access patterns that may indicate exploitation attempts targeting this specific vulnerability.