Overview
CVE-2025-4823 is a critical vulnerability discovered in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability has a high impact on the security of these devices, as it allows attackers to potentially compromise the system or leak sensitive data. The flaw lies within the HTTP POST Request Handler, specifically the function submit-url of the file /boafrm/formReflashClientTbl. Given the widespread use of these routers, this vulnerability poses a significant risk to both individuals and organizations, necessitating immediate attention and remediation.
Vulnerability Summary
CVE ID: CVE-2025-4823
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
TOTOLINK A702R | 3.0.0-B20230809.1615
TOTOLINK A3002R | 3.0.0-B20230809.1615
TOTOLINK A3002RU | 3.0.0-B20230809.1615
How the Exploit Works
The vulnerability is a buffer overflow issue. It arises due to insufficient bounds checking by the HTTP POST Request Handler when processing input data within the submit-url function of the /boafrm/formReflashClientTbl file. An attacker could exploit this vulnerability by sending a specially crafted HTTP POST request with an oversized payload to the vulnerable endpoint. This could overflow the buffer, causing memory corruption, and potentially allowing the attacker to execute arbitrary code or cause a Denial of Service (DoS) condition.
Conceptual Example Code
Here’s a basic concept of how the vulnerability might be exploited:
POST /boafrm/formReflashClientTbl HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Content-Length: [Length]
submit-url=[overly long string here]In this conceptual example, the “submit-url” parameter contains a string that is longer than the buffer can handle, causing a buffer overflow.
Please note that this is a simplified representation of how an exploit might look, and a real-world exploit would likely be more complex and tailored to the specific characteristics of the target system.