CVE-2025-10942 in Magic B3
Summary
by MITRE • 09/25/2025
A vulnerability was identified in H3C Magic B3 up to 100R002. This affects the function AddMacList/EditMacList of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 11/14/2025
The vulnerability CVE-2025-10942 resides within the H3C Magic B3 device firmware version 100R002 and earlier, presenting a critical buffer overflow condition in the web-based administration interface. This flaw manifests specifically within the AddMacList and EditMacList functions of the /goform/aspForm endpoint, which serves as a crucial interface for managing MAC address lists on the device. The vulnerability stems from improper input validation of the param argument, creating an exploitable condition where maliciously crafted input can exceed the allocated buffer space and overwrite adjacent memory regions.
The technical implementation of this vulnerability follows the classic buffer overflow pattern where the application fails to properly bounds-check user-supplied data before copying it into fixed-size memory buffers. The param argument in the.aspForm endpoint receives input from HTTP POST requests and is processed without adequate sanitization, allowing attackers to inject excessive data that overflows the designated buffer. This condition creates opportunities for arbitrary code execution, system crashes, or privilege escalation depending on the memory layout and protection mechanisms in place. The vulnerability's classification aligns with CWE-121 Stack-based Buffer Overflow and CWE-122 Heap-based Buffer Overflow, representing fundamental memory safety issues that have been extensively documented in cybersecurity literature.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it enables remote code execution capabilities that could compromise the entire network infrastructure managed by the affected device. Attackers can exploit this vulnerability from outside the network perimeter without requiring authentication, making it particularly dangerous for network administrators who rely on web-based management interfaces. The availability of public exploits increases the risk profile significantly, as demonstrated by the vendor's lack of response to early disclosure attempts, suggesting either limited resources for patch development or delayed security response protocols. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1203 Exploitation for Client Execution, as it enables unauthorized code execution through web-based attack vectors.
Mitigation strategies for this vulnerability must include immediate firmware updates from H3C, if available, or network segmentation to isolate affected devices from critical network segments. Network administrators should implement strict input validation controls at the firewall level and monitor for suspicious traffic patterns targeting the /goform/aspForm endpoint. The vulnerability also highlights the importance of secure coding practices and regular security assessments for network infrastructure devices, particularly those with web-based management interfaces. Organizations should consider implementing intrusion detection systems that can identify exploitation attempts targeting known vulnerable endpoints, and establish incident response procedures specifically addressing remote code execution vulnerabilities in network infrastructure devices. The lack of vendor response underscores the need for organizations to maintain independent security assessment capabilities and consider alternative solutions when vendors fail to provide timely security patches for critical vulnerabilities.