CVE-2022-35559 in Tenda
Summary
by MITRE • 08/12/2022
A stack overflow vulnerability exists in /goform/setAutoPing in Tenda W6 V1.0.0.9(4122), which allows an attacker to construct ping1 parameters and ping2 parameters for a stack overflow attack. An attacker can use this vulnerability to execute arbitrary code execution.
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Analysis
by VulDB Data Team • 08/12/2022
The CVE-2022-35559 vulnerability represents a critical stack overflow flaw discovered in the Tenda W6 V1.0.0.9(4122) router firmware, specifically within the /goform/setAutoPing endpoint. This vulnerability falls under the CWE-121 stack-based buffer overflow category, where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the stack. The affected device operates a web-based management interface that processes user input through the setAutoPing form handler, creating a direct pathway for malicious input to be processed without adequate validation or sanitization.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious ping1 and ping2 parameters that exceed the allocated buffer space within the stack memory allocation. These parameters are typically used for network connectivity testing and automatic ping functionality within the router's configuration interface. When the firmware processes these parameters through the vulnerable endpoint, the insufficient input validation causes a buffer overflow condition that can overwrite return addresses, function pointers, and other critical stack data structures. This memory corruption fundamentally compromises the router's execution flow and provides a pathway for arbitrary code execution.
The operational impact of this vulnerability extends beyond simple remote code execution, as it allows attackers to gain full administrative control over the affected router. This compromise enables attackers to modify network configurations, redirect traffic, establish persistent backdoors, and potentially use the compromised device as a pivot point for attacking other systems within the local network. The vulnerability affects the device's web management interface and is accessible over the network, making it particularly dangerous as it requires no physical access or authentication. Attackers can leverage this vulnerability to create persistent access points, install malware, or use the compromised device for further network reconnaissance and lateral movement activities.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the T1059 command and scripting interpreter category, as the arbitrary code execution capability allows attackers to deploy malicious payloads and establish persistent access. The vulnerability also maps to T1071 application layer protocol, as attackers can exploit the web interface protocols to deliver malicious payloads. Mitigation strategies should include immediate firmware updates from Tenda, network segmentation to limit access to management interfaces, and implementing network monitoring to detect unusual traffic patterns from compromised devices. Additionally, organizations should disable unnecessary services, implement strong access controls, and conduct regular vulnerability assessments to identify similar weaknesses in other network infrastructure devices. The vulnerability highlights the importance of input validation and proper memory management practices in embedded systems and web applications, emphasizing the need for robust security testing throughout the development lifecycle.