CVE-2023-33643 in Magic R300
Summary
by MITRE • 06/01/2023
H3C Magic R300 version R300-2100MV100R004 was discovered to contain a stack overflow via the AddWlanMacList interface at /goform/aspForm.
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Analysis
by VulDB Data Team • 01/05/2026
The vulnerability identified as CVE-2023-33643 affects H3C Magic R300 routers running firmware version R300-2100MV100R004 and represents a critical stack overflow condition that can be exploited through the AddWlanMacList interface located at /goform/aspForm. This issue falls under the CWE-121 stack-based buffer overflow category, where insufficient bounds checking allows an attacker to write data beyond the allocated stack buffer space. The affected device operates with a web-based management interface that processes form data through the specified endpoint, making it susceptible to malicious input manipulation. The stack overflow vulnerability occurs when the application fails to properly validate the length of input parameters passed to the AddWlanMacList function, allowing an attacker to overwrite adjacent stack memory locations with controlled data.
The operational impact of this vulnerability extends beyond simple denial of service scenarios as it provides potential for remote code execution and complete system compromise. Attackers can craft malicious payloads that exploit the buffer overflow to overwrite return addresses, function pointers, or other critical stack variables, enabling arbitrary code execution within the router's privileged execution context. This vulnerability specifically targets the wireless network management functionality of the device, allowing attackers to manipulate MAC address lists and potentially gain unauthorized access to the wireless network configuration. The attack surface is particularly concerning given that the vulnerable interface is accessible through the web management portal, which is typically exposed to external networks. The exploitation requires minimal privileges since the vulnerable endpoint likely operates with administrative permissions, making the attack vector highly attractive to threat actors seeking persistent access to network infrastructure.
Mitigation strategies for CVE-2023-33643 should prioritize immediate firmware updates from H3C to address the underlying stack overflow condition. Network administrators must implement strict network segmentation and firewall rules to restrict access to the affected web management interface, particularly blocking external access to port 80 and 443 on the router. The implementation of web application firewalls and input validation controls can help detect and prevent malicious payloads targeting the vulnerable AddWlanMacList endpoint. Additionally, organizations should conduct comprehensive network scanning to identify all affected devices and establish monitoring procedures to detect potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter and T1071.004 for application layer protocol network communication, indicating that exploitation would likely involve crafting specific HTTP requests to trigger the buffer overflow. Security teams should also consider implementing network access control lists and disabling unnecessary services to reduce the attack surface, while maintaining regular vulnerability assessments to identify similar issues in other network infrastructure components.