CVE-2022-32032 in AX1806
Summary
by MITRE • 07/01/2022
Tenda AX1806 v1.0.0.1 was discovered to contain a stack overflow via the deviceList parameter in the function formAddMacfilterRule.
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Analysis
by VulDB Data Team • 07/18/2022
The vulnerability identified as CVE-2022-32032 affects the Tenda AX1806 router firmware version 1.0.0.1 and represents a critical stack overflow condition that can be exploited through improper input validation. This flaw exists within the deviceList parameter processing within the formAddMacfilterRule function, creating a potential pathway for remote code execution and system compromise. The vulnerability stems from inadequate bounds checking and memory management practices during parameter handling, allowing malicious actors to manipulate the stack memory structure through crafted input sequences.
This stack overflow vulnerability falls under the CWE-121 category of stack-based buffer overflow conditions, where the deviceList parameter fails to properly validate input length and content before processing. The function formAddMacfilterRule processes MAC filtering rules for device access control, making it a critical component for network security enforcement. Attackers can exploit this weakness by sending specially crafted requests containing excessive data in the deviceList parameter, causing the stack to overflow and potentially overwrite adjacent memory locations including return addresses and function pointers. The vulnerability demonstrates a fundamental flaw in input sanitization and memory allocation practices that violates secure coding principles.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it can enable full system compromise and unauthorized access to the router's administrative functions. An attacker who successfully exploits this vulnerability could gain root access to the device, allowing them to modify network configurations, install malicious firmware, or establish persistent backdoors for continued access. The attack surface is particularly concerning given that this affects a consumer-grade router with default administrative credentials, making it accessible to attackers with minimal reconnaissance requirements. The vulnerability also impacts the device's ability to maintain proper network security policies, as MAC filtering rules can be manipulated to bypass access controls.
Mitigation strategies for CVE-2022-32032 should prioritize immediate firmware updates from Tenda to address the underlying stack overflow conditions. Network administrators should implement network segmentation and access control measures to limit exposure, while also monitoring for suspicious network activity that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage, as successful exploitation could enable attackers to execute arbitrary commands on the affected device. Organizations should also consider implementing network intrusion detection systems to monitor for patterns consistent with stack overflow exploitation attempts. Regular security assessments and firmware update policies should be enforced to prevent similar vulnerabilities from remaining unpatched in network infrastructure devices.