CVE-2022-32035 in Tenda
Summary
by MITRE • 07/01/2022
Tenda M3 V1.0.0.12 was discovered to contain a stack overflow via the function formMasterMng.
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Analysis
by VulDB Data Team • 07/18/2022
The vulnerability identified as CVE-2022-32035 represents a critical stack overflow condition within the Tenda M3 router firmware version 1.0.0.12. This issue manifests through the formMasterMng function, which processes user-supplied input without adequate validation or bounds checking mechanisms. The stack overflow vulnerability occurs when maliciously crafted data is passed to this function, potentially allowing attackers to overwrite adjacent memory locations on the stack. Such memory corruption can lead to arbitrary code execution or system crashes, fundamentally compromising the device's operational integrity and security posture. The vulnerability stems from improper input handling practices that violate fundamental security principles of input validation and buffer management. This flaw exists within the router's web interface processing logic, where user inputs are directly fed into the vulnerable function without sanitization. The attack surface is particularly concerning as it allows remote exploitation through web-based interfaces, making it accessible to attackers without physical access to the device. This vulnerability directly maps to CWE-121 Stack-based Buffer Overflow, which is classified under the Common Weakness Enumeration framework as a critical security flaw. The MITRE ATT&CK framework categorizes this issue under the T1203 Exploitation for Client Execution technique, as it enables attackers to execute malicious code on the target system. The affected Tenda M3 V1.0.0.12 firmware represents a significant risk to network security as routers serve as primary network gateways and are often deployed in unsecured environments. The stack overflow vulnerability creates opportunities for attackers to gain unauthorized access to the device, potentially enabling them to establish persistent backdoors, monitor network traffic, or redirect traffic through malicious proxies. Network administrators should be particularly concerned as these devices are commonly deployed in residential and small office environments where security monitoring is limited. The impact extends beyond individual device compromise to potential network-wide infiltration, as compromised routers can serve as launching points for broader attacks against connected systems. The vulnerability's remote exploitability means that attackers can target affected devices from anywhere on the internet, making it particularly dangerous for organizations that have not yet patched their firmware. The exploitation requires no specialized tools beyond standard web-based attack frameworks, making it accessible to threat actors with minimal technical expertise. This vulnerability underscores the importance of firmware security updates and proper input validation practices in embedded systems. Organizations should immediately implement firmware updates provided by Tenda to address this critical vulnerability. Additionally, network segmentation and intrusion detection systems can serve as compensating controls to mitigate the risk while waiting for official patches. The incident highlights the need for comprehensive security testing of embedded firmware and adherence to secure coding practices that prevent buffer overflow conditions in network devices.