Overview
CVE-2025-14015 is a high-severity buffer overflow vulnerability affecting H3C Magic B0 routers up to version 100R002. This flaw resides in the EditWlanMacList function within the /goform/aspForm file. A remote attacker can exploit this vulnerability by manipulating the param argument, leading to a buffer overflow. Exploit code is publicly available, increasing the risk of exploitation. Unfortunately, the vendor has not responded to initial disclosure attempts.
Technical Details
The vulnerability stems from insufficient input validation on the param argument passed to the EditWlanMacList function. By providing a string exceeding the allocated buffer size, an attacker can overwrite adjacent memory regions. This can potentially lead to arbitrary code execution, allowing the attacker to gain complete control over the affected router.
The vulnerable file is /goform/aspForm, which likely handles web-based configuration requests. The EditWlanMacList function, as its name suggests, probably manages the MAC address whitelist for the router’s wireless interface. Exploiting this vulnerability likely involves crafting a malicious HTTP request targeting this function.
CVSS Analysis
- CVSS Score: 8.8 (HIGH)
A CVSS score of 8.8 indicates a high-severity vulnerability. This high score is primarily due to the remote exploitability, the potential for arbitrary code execution, and the availability of exploit code. The lack of required authentication likely also contributes to the high score.
Possible Impact
Successful exploitation of CVE-2025-14015 can have severe consequences:
- Complete Router Compromise: Attackers can gain full control of the router, allowing them to modify settings, intercept network traffic, and use the router as a launchpad for further attacks.
- Data Theft: Sensitive information transmitted through the network can be intercepted and stolen.
- Denial of Service (DoS): Attackers can cause the router to crash, disrupting network connectivity for all connected devices.
- Botnet Recruitment: Compromised routers can be added to botnets and used to launch distributed denial-of-service (DDoS) attacks or send spam.
Mitigation or Patch Steps
Unfortunately, given the vendor’s lack of response, a patch is not currently available. Therefore, the following mitigation strategies are recommended:
- Discontinue Use: The most secure option is to discontinue the use of H3C Magic B0 routers (up to version 100R002) and replace them with more secure alternatives.
- Network Segmentation: If discontinuing use is not feasible, isolate the H3C Magic B0 router on a separate network segment with limited access to critical resources.
- Firewall Restrictions: Implement strict firewall rules to limit access to the router’s management interface from untrusted networks.
- Monitor Network Traffic: Closely monitor network traffic for any suspicious activity originating from or directed towards the router. Look for unusual traffic patterns or connections to known malicious hosts.
Important: These mitigation steps provide only limited protection. The best solution is to replace the vulnerable router.
