CVE-2023-0077 in Router Manager
Summary
by MITRE • 01/05/2023
Integer overflow or wraparound vulnerability in CGI component in Synology Router Manager (SRM) before 1.2.5-8227-6 and 1.3.1-9346-3 allows remote attackers to overflow buffers via unspecified vectors.
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Analysis
by VulDB Data Team • 01/28/2023
The integer overflow vulnerability identified in CVE-2023-0077 affects the CGI component of Synology Router Manager software, representing a critical security flaw that can be exploited remotely by attackers without authentication. This vulnerability exists in versions prior to 1.2.5-8227-6 and 1.3.1-9346-3, indicating a widespread impact across multiple software releases. The flaw manifests as an integer wraparound condition within the CGI processing logic, which can lead to unpredictable behavior when handling user-supplied input data. The unspecified vectors suggest that the vulnerability could be triggered through various attack surfaces within the CGI component, potentially including web interface parameters, API calls, or other input mechanisms that process numerical data.
The technical nature of this vulnerability aligns with CWE-190, which specifically addresses integer overflow conditions where an integer value exceeds the maximum representable value and wraps around to a smaller value. In the context of CGI components, such vulnerabilities typically occur when developers fail to properly validate or sanitize integer inputs before performing arithmetic operations or buffer size calculations. When an attacker can manipulate input parameters to cause integer overflow, the system may allocate insufficient buffer space or perform invalid memory operations, leading to potential memory corruption. This type of flaw is particularly dangerous in network-facing applications like router management interfaces because it can enable attackers to execute arbitrary code, cause denial of service conditions, or potentially escalate privileges within the affected system.
From an operational perspective, this vulnerability presents significant risks to network infrastructure security as Synology Router Manager serves as a critical management interface for network devices. The remote exploitability means that attackers can potentially compromise router configurations without requiring physical access or local credentials, making this a high-impact threat for organizations relying on Synology networking equipment. The buffer overflow conditions resulting from integer wraparound can lead to system instability, application crashes, or more severe consequences including unauthorized access to network management functions. Attackers might leverage this vulnerability to gain persistent access to router configurations, modify network settings, or establish backdoor access points within the network infrastructure. The impact extends beyond individual device compromise as compromised routers can serve as entry points for broader network infiltration, particularly in enterprise environments where router management systems control critical network operations.
Organizations should prioritize immediate remediation by upgrading to the patched versions of Synology Router Manager software, specifically versions 1.2.5-8227-6 or 1.3.1-9346-3, which contain fixes for the integer overflow conditions. Network administrators should implement monitoring for unusual traffic patterns or unauthorized access attempts that might indicate exploitation attempts. Additional mitigations include restricting access to the router management interface to trusted networks only, implementing network segmentation to limit the potential impact of compromise, and conducting thorough vulnerability assessments of all network management systems. The vulnerability also highlights the importance of input validation and proper integer handling in web applications, particularly in components that process user-supplied data for buffer allocation or loop control. Security teams should consider implementing runtime protections such as address space layout randomization and stack canaries to reduce the effectiveness of exploitation attempts, while also following ATT&CK framework guidance for defending against remote code execution vulnerabilities in network infrastructure components.