CVE-2022-38534 in 720R
Summary
by MITRE • 09/15/2022
TOTOLINK-720R v4.1.5cu.374 was discovered to contain a remote code execution (RCE) vulnerability via the setdiagnosicfg function.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/18/2022
The vulnerability identified as CVE-2022-38534 represents a critical remote code execution flaw in TOTOLINK-720R routers running firmware version v4.1.5cu.374. This issue stems from insufficient input validation within the setdiagnosicfg function, which processes diagnostic configuration parameters without proper sanitization. The affected device operates under the common weak security practices that have plagued many consumer and small office networking devices, where administrative functions are exposed without adequate authentication mechanisms or input filtering.
The technical exploitation of this vulnerability occurs through manipulation of the setdiagnosicfg function, which accepts user-supplied parameters that are directly incorporated into system commands without proper validation or escaping. This creates a classic command injection scenario where malicious actors can execute arbitrary code on the affected device with the privileges of the web server process. The vulnerability falls under CWE-77 and CWE-94 categories, representing command injection and improper neutralization of special elements used in code, respectively. The ATT&CK framework classification would place this under T1059.007 for command and script interpreter, specifically focusing on the use of web shell or command execution techniques.
Operationally, this vulnerability enables attackers to gain complete control over the affected router, allowing them to modify network configurations, establish persistent backdoors, redirect traffic, or use the device as a pivot point for further attacks within the local network. The impact extends beyond simple device compromise as routers serve as critical network infrastructure components, making this vulnerability particularly dangerous for both home and enterprise environments. Attackers can leverage this RCE to perform man-in-the-middle attacks, monitor network traffic, or create botnet nodes, with the potential to affect hundreds of connected devices.
Mitigation strategies should focus on immediate firmware updates from TOTOLINK, as the vendor has likely released patches addressing this specific vulnerability. Network segmentation and firewall rules should be implemented to restrict access to administrative interfaces from untrusted networks. Additionally, organizations should consider disabling unnecessary services and implementing robust network monitoring to detect anomalous command execution patterns. The vulnerability highlights the importance of secure coding practices and proper input validation, particularly for functions handling user data in network infrastructure devices, aligning with industry best practices outlined in NIST SP 800-160 and ISO/IEC 27001 standards for secure network device management.