Overview
The cybersecurity community is currently dealing with a critical vulnerability in TOTOLINK N302R Plus, an issue that potentially puts countless systems at risk. Identified as CVE-2025-5672, this vulnerability resides in an unknown functionality of the file /boafrm/formFilter of the component HTTP POST Request Handler. It is especially concerning due to its high severity and the fact that it can be exploited remotely, making it a significant threat to both businesses and individuals using the affected product.
The vulnerability is a buffer overflow, a common but severe type of security flaw that can lead to system compromise or data leakage. This vulnerability is particularly worrisome as the exploit has been disclosed to the public and may be actively used by malicious actors.
Vulnerability Summary
CVE ID: CVE-2025-5672
Severity: Critical, CVSS score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
TOTOLINK N302R Plus | Versions up to 3.4.0-B20201028
How the Exploit Works
The exploit works by manipulating the ‘url’ argument in the HTTP POST Request Handler. This leads to a buffer overflow, a situation where more data is put into a buffer than it can handle. This can cause the excess data to overflow into adjacent memory spaces, potentially leading to unauthorized access to information or system control.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is a hypothesized HTTP request that causes the buffer overflow.
POST /boafrm/formFilter HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "url": "http://example.com/[...excessive number of characters...]" }In this example, the ‘url’ argument is filled with an excessive number of characters, causing a buffer overflow in the HTTP POST Request Handler.
Mitigation
To mitigate this vulnerability, users of the affected versions of TOTOLINK N302R Plus are encouraged to apply the vendor patch. If this is not immediately possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. However, these only provide temporary protection and do not address the root cause of the vulnerability, so applying the vendor patch should be prioritized.