CVE-2024-7908 in EX1200L
Summary
by MITRE • 08/18/2024
A vulnerability, which was classified as critical, was found in TOTOLINK EX1200L 9.3.5u.6146_B20201023. Affected is the function setDefResponse of the file /www/cgi-bin/cstecgi.cgi. The manipulation of the argument IpAddress leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/19/2024
The vulnerability identified as CVE-2024-7908 represents a critical stack-based buffer overflow flaw within the TOTOLINK EX1200L router firmware version 9.3.5u.6146_B20201023. This vulnerability specifically affects the setDefResponse function located in the /www/cgi-bin/cstecgi.cgi file, which serves as a critical component in the router's web-based management interface. The flaw manifests when processing the IpAddress argument, creating a condition where malicious input can exceed the allocated buffer space on the stack. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and represents a serious security risk that can be exploited remotely without requiring local access or authentication. The attack vector is particularly concerning as it can be executed entirely through network-based communication, making it accessible to attackers regardless of their physical proximity to the device.
The operational impact of this vulnerability extends beyond simple remote code execution capabilities, as it fundamentally compromises the integrity and confidentiality of the affected network infrastructure. When an attacker successfully exploits this buffer overflow, they can potentially gain unauthorized control over the router's operating system, enabling them to modify network configurations, intercept traffic, redirect users to malicious sites, or establish persistent backdoors. The stack-based nature of the overflow means that attackers can overwrite critical program execution data, potentially leading to complete system compromise. This vulnerability aligns with ATT&CK technique T1059.007, which covers command and scripting interpreter usage, as successful exploitation could enable attackers to execute arbitrary commands on the affected device. The fact that this exploit has been publicly disclosed and is available for use significantly increases the risk profile, as it removes the requirement for advanced exploitation techniques and makes the vulnerability accessible to a broader range of threat actors.
Mitigation strategies for CVE-2024-7908 should prioritize immediate firmware updates from TOTOLINK, as this represents the most effective defense against the known vulnerability. Network administrators should implement network segmentation to limit the potential impact of exploitation, while also deploying intrusion detection systems to monitor for suspicious traffic patterns that might indicate exploitation attempts. The affected device should be isolated from critical network segments until a patched firmware version is deployed, and all network traffic to and from the router should be monitored for anomalies. Additionally, implementing network access control measures and regularly reviewing router configurations can help reduce the attack surface. Organizations should also consider deploying web application firewalls to filter potentially malicious requests targeting the cgi-bin interface, while maintaining regular vulnerability assessments to identify similar issues in other network devices. The lack of vendor response to early disclosure attempts underscores the importance of proactive security measures and the need for organizations to maintain independent vulnerability management processes rather than relying solely on vendor remediation timelines.