CVE-2023-33641 in Magic R300
Summary
by MITRE • 06/01/2023
H3C Magic R300 version R300-2100MV100R004 was discovered to contain a stack overflow via the AddMacList interface at /goform/aspForm.
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Analysis
by VulDB Data Team • 01/05/2026
The vulnerability identified as CVE-2023-33641 affects H3C Magic R300 routers running firmware version R300-2100MV100R004 and represents a critical stack overflow condition within the device's web interface. This flaw exists in the AddMacList interface located at the /goform/aspForm endpoint, which processes incoming requests without proper input validation mechanisms. The stack overflow vulnerability creates a potential pathway for remote code execution and system compromise, as attackers can manipulate the input parameters to overflow the stack buffer and overwrite critical memory locations including return addresses and function pointers.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. The affected interface processes MAC address list additions through a web form submission mechanism, making it accessible via standard HTTP requests. Attackers can exploit this by crafting malicious payloads that exceed the allocated buffer space, potentially leading to arbitrary code execution with the privileges of the web server process. The vulnerability demonstrates poor input validation practices and inadequate memory management within the router's firmware implementation, particularly in the handling of user-supplied data through the web administration interface.
Operationally, this vulnerability presents significant risks to network infrastructure security as it allows remote attackers to gain unauthorized access to the router's administrative functions. The impact extends beyond simple privilege escalation to include complete system compromise, data exfiltration, and potential use as a pivot point for further network attacks. An attacker could leverage this vulnerability to modify network configurations, establish persistent backdoors, or redirect traffic through malicious intermediaries. The exposure through the web interface means that any network user with access to the router's management portal could potentially exploit this vulnerability, making it particularly dangerous in enterprise environments where multiple administrators may have access. The vulnerability also violates several ATT&CK framework techniques including T1059 for command and script execution, T1078 for valid accounts, and T1566 for phishing with malicious attachments or links.
Mitigation strategies for CVE-2023-33641 should prioritize immediate firmware updates from H3C to address the stack overflow condition. Network administrators should implement network segmentation to isolate affected devices and restrict access to the web management interface through firewall rules and access control lists. Additional defensive measures include monitoring network traffic for suspicious requests to the /goform/aspForm endpoint and implementing intrusion detection systems to identify exploitation attempts. The vulnerability highlights the importance of input validation and memory safety practices in embedded systems, particularly in network infrastructure devices. Organizations should also conduct comprehensive vulnerability assessments of their network infrastructure to identify similar issues in other H3C devices or third-party equipment. Regular security audits and firmware update policies are essential to maintain device security posture and prevent exploitation of known vulnerabilities in network infrastructure components.