Overview
A critical vulnerability, identified as CVE-2025-4732, has been discovered in TOTOLINK A3002R and A3002RU 3.0.0-B20230809.1615. This flaw affects an unknown section of code in the file /boafrm/formFilter, which is a component of the HTTP POST Request Handler. The vulnerability is triggered by an improper handling of the argument ip6addr, leading to a buffer overflow. This flaw is especially alarming as the attack can be launched remotely and the exploit is already publicly disclosed, increasing the chances of exploitation by malicious users.
Vulnerability Summary
CVE ID: CVE-2025-4732
Severity: Critical, CVSS Score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The exploit works by manipulating the ‘ip6addr’ argument in the HTTP POST Request Handler. The manipulation causes an overflow of the buffer, potentially allowing a malicious actor to execute arbitrary code or disrupt the operation of the device, leading to a potential system compromise or data leakage.
Conceptual Example Code
A conceptual malicious HTTP POST request might look like the following:
POST /boafrm/formFilter HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
ip6addr=AAAA...[long string of A's to cause buffer overflow]...In this example, the ‘ip6addr’ argument is filled with a long string designed to overflow the buffer. The result is a potential system compromise or data leakage, depending on the nature of the overflow and the system’s response to it.
Mitigation Steps
In order to mitigate this vulnerability, it is recommended to apply the vendor patch as soon as it is available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These tools can help in detecting and blocking malicious HTTP POST requests that aim to exploit this particular vulnerability.