CVE-2024-51248 in Vigor 3900
Summary
by MITRE • 11/01/2024
In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitrary commands by calling the modifyrow function.
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Analysis
by VulDB Data Team • 11/01/2024
The vulnerability identified as CVE-2024-51248 affects the Draytek Vigor3900 router firmware version 1.5.1.3, representing a critical command injection flaw that allows remote attackers to execute arbitrary code on the affected device. This vulnerability resides within the mainfunction.cgi web interface component and specifically targets the modifyrow function, which processes user input without adequate sanitization or validation mechanisms. The flaw enables attackers to inject malicious commands directly into the router's command execution pipeline, potentially compromising the entire network infrastructure controlled by the device.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the web application layer of the router's firmware. When the modifyrow function processes incoming parameters through mainfunction.cgi, it fails to properly escape or filter user-supplied data before incorporating it into system commands. This classic command injection vulnerability falls under CWE-77 which specifically addresses improper neutralization of special elements used in commands. The vulnerability is particularly dangerous because it operates at the system level where administrative privileges are typically required, but the attack vector allows unauthenticated remote exploitation, making it especially severe for network security.
Operationally, this vulnerability presents a significant risk to organizations relying on Draytek Vigor3900 routers for network infrastructure management. Attackers can leverage this flaw to gain full administrative control over the affected devices, potentially leading to complete network compromise, data exfiltration, or establishment of persistent backdoors. The remote nature of the attack means that adversaries do not require physical access or local network presence to exploit the vulnerability, making it particularly attractive for large-scale attacks targeting multiple network segments. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1021.001 (Remote Services: Remote Desktop Protocol) as attackers could use the compromised device as a pivot point for further network exploration and lateral movement.
Mitigation strategies for CVE-2024-51248 should prioritize immediate firmware updates from Draytek to address the underlying command injection flaw in mainfunction.cgi. Network administrators must also implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Additional protective measures include disabling unnecessary web management interfaces, implementing strict firewall rules to restrict access to router management ports, and deploying intrusion detection systems to monitor for suspicious command execution patterns. The vulnerability demonstrates the critical importance of input validation in web applications and highlights the need for regular security assessments of network infrastructure components. Organizations should also consider implementing network monitoring solutions that can detect anomalous command execution behavior indicative of command injection attacks. Given the severity of this vulnerability, immediate remediation is essential to prevent potential exploitation by threat actors who may be actively targeting this specific flaw in the wild.