CVE-2022-32385 in AC23
Summary
by MITRE • 07/06/2022
Tenda AC23 v16.03.07.44 is vulnerable to Stack Overflow that will allow for the execution of arbitrary code (remote).
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Analysis
by VulDB Data Team • 02/11/2023
The vulnerability identified as CVE-2022-32385 affects the Tenda AC23 wireless router firmware version 16.03.07.44 and represents a critical stack overflow condition that enables remote code execution. This flaw exists within the device's web management interface where input validation mechanisms fail to properly handle excessive data payloads. The stack overflow occurs when processing specific HTTP requests sent to the affected device, allowing attackers to overwrite critical memory segments including return addresses and function pointers. The vulnerability stems from improper bounds checking in the firmware's handling of user-supplied data, specifically within the parameter parsing routines of the web server component. This issue falls under CWE-121 Stack-based Buffer Overflow which is classified as a severe vulnerability category in the Common Weakness Enumeration catalog.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise. An attacker capable of sending malicious HTTP requests to the affected router can potentially gain full administrative control over the device, enabling them to modify network settings, intercept traffic, redirect connections, or establish persistent backdoors. The remote nature of this exploit means that attackers do not require physical access to the device or network proximity to exploit the vulnerability, making it particularly dangerous in enterprise and residential networking environments. The stack overflow allows for arbitrary code execution because the attacker can manipulate the program flow by overwriting the stack frame, potentially leading to privilege escalation and system takeover. This vulnerability directly maps to ATT&CK technique T1210 Exploitation of Remote Services as it leverages unpatched network services to achieve unauthorized access.
Mitigation strategies for CVE-2022-32385 should prioritize immediate firmware updates from Tenda's official support channels to address the underlying stack overflow conditions. Network administrators should implement strict firewall rules to restrict access to the router's web management interface from untrusted networks while ensuring that only authorized personnel can reach the device. Additional protective measures include disabling unnecessary services, implementing network segmentation, and monitoring for unusual traffic patterns that might indicate exploitation attempts. The vulnerability highlights the importance of proper input validation and memory management practices in embedded systems, particularly those with web interfaces. Organizations should consider conducting vulnerability assessments to identify other potentially affected devices within their network infrastructure and ensure that all firmware components are regularly updated to prevent similar issues. The security community should also be aware that such vulnerabilities often indicate broader issues with software quality assurance processes in embedded networking equipment, emphasizing the need for robust security testing throughout the development lifecycle.