CVE-2022-33007 in TEW-751DR
Summary
by MITRE • 06/28/2022
TRENDnet Wi-Fi routers TEW751DR v1.03 and TEW-752DRU v1.03 were discovered to contain a stack overflow via the function genacgi_main.
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Analysis
by VulDB Data Team • 07/16/2022
The vulnerability identified as CVE-2022-33007 affects TRENDnet Wi-Fi routers model TEW751DR v1.03 and TEW-752DRU v1.03, representing a critical stack overflow condition that stems from improper input validation within the genacgi_main function. This flaw resides in the web-based administration interface of these network devices, creating a potential entry point for malicious actors to execute arbitrary code on affected systems. The stack overflow occurs when the router processes specially crafted input parameters through the genacgi_main function, leading to memory corruption that can be exploited to gain unauthorized access to the device's operating system.
The technical implementation of this vulnerability demonstrates a classic buffer overflow scenario where insufficient bounds checking allows an attacker to overwrite adjacent memory locations on the stack. The genacgi_main function fails to properly validate the length of input data received through HTTP requests, particularly those targeting administrative functions. This weakness aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking permits memory corruption. The vulnerability exists within the device's firmware implementation, specifically in how it handles user-supplied input parameters passed to the web server component.
Operationally, this vulnerability presents significant risks to network security as it allows remote code execution without authentication requirements. An attacker can exploit this flaw by sending maliciously crafted HTTP requests to the router's web interface, potentially gaining full administrative control over the device. Once compromised, the router can be used as a pivot point for lateral movement within the network, DNS tunneling, or as a platform for launching further attacks against internal systems. The impact extends beyond individual device compromise since these routers often serve as primary network gateways, making them attractive targets for attackers seeking persistent access to corporate or residential networks. This vulnerability directly maps to ATT&CK technique T1059.007 for command and control communication and T1071.001 for application layer protocol usage.
Mitigation strategies for CVE-2022-33007 should prioritize immediate firmware updates from TRENDnet, as the vendor has released patches addressing this specific stack overflow condition. Network administrators should implement network segmentation to limit lateral movement opportunities and monitor for suspicious network traffic patterns that might indicate exploitation attempts. Additional protective measures include disabling unnecessary web administration interfaces, implementing strict access controls, and regularly auditing router configurations for unauthorized modifications. The vulnerability highlights the importance of secure coding practices and input validation in embedded systems, emphasizing that devices with web interfaces must properly validate all user-supplied data to prevent memory corruption attacks. Organizations should also consider deploying network monitoring solutions capable of detecting anomalous HTTP request patterns that could indicate exploitation attempts against similar vulnerabilities in network infrastructure devices.