CVE-2024-31807 in EX200
Summary
by MITRE • 04/08/2024
TOTOLINK EX200 V4.0.3c.7646_B20201211 was discovered to contain a remote code execution (RCE) vulnerability via the hostTime parameter in the NTPSyncWithHost function.
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Analysis
by VulDB Data Team • 08/13/2024
The vulnerability identified as CVE-2024-31807 affects the TOTOLINK EX200 router model running firmware version V4.0.3c.7646_B20201211 and represents a critical remote code execution flaw that could allow attackers to gain unauthorized control over the device. This vulnerability resides within the NTPSyncWithHost function, specifically through manipulation of the hostTime parameter, which demonstrates a classic input validation weakness that has significant implications for network security infrastructure.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input parameters within the router's web interface handling mechanism. When the hostTime parameter is processed by the NTPSyncWithHost function, the system fails to properly validate or sanitize the input before incorporating it into system commands or configuration processes. This oversight creates a path for malicious actors to inject arbitrary commands that execute with the privileges of the web server process, potentially escalating to full system compromise. The vulnerability aligns with CWE-77 and CWE-94 categories, representing command injection flaws that allow attackers to execute arbitrary code on the target system.
Operationally, this vulnerability presents a severe risk to network security as it enables remote attackers to execute code without requiring authentication or physical access to the device. The implications extend beyond simple device compromise, as compromised routers can serve as entry points for broader network infiltration, allowing attackers to establish persistent access, redirect traffic, or use the device as a pivot point for attacking other systems within the network. Network administrators face the challenge of securing devices that may be remotely exploitable, with the attack surface extending to any system that relies on the router's network services or security policies.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from TOTOLINK as the primary defense mechanism, as the vendor is likely to have released patches addressing the input validation gap. Network segmentation and firewall rules should be implemented to restrict access to the router's administrative interfaces, particularly limiting access to trusted networks only. Additionally, monitoring for unusual network traffic patterns or unauthorized configuration changes can help detect exploitation attempts. Security professionals should consider implementing network access controls and regular vulnerability scanning to identify similar issues across the network infrastructure, as this vulnerability demonstrates the importance of input validation in embedded systems and web applications. The ATT&CK framework categorizes this type of vulnerability under T1059 for command and scripting interpreter, highlighting the need for comprehensive defensive measures that address both the immediate exploit and broader attack surface considerations.