Overview
A high-severity vulnerability, CVE-2025-9783, has been identified in the TOTOLINK A702R 4.0.0-B20211108.1423. This vulnerability affects a specific function of the file /boafrm/formParentControl that may potentially allow an attacker to compromise the system or leak sensitive data. As this exploit has been publicly disclosed, it poses a significant threat to any system or network running on this version of TOTOLINK A702R.
The vulnerability exploits a buffer overflow in the function sub_418030, which could be triggered by manipulating the argument ‘submit-url. This issue is particularly concerning because the attack may be launched remotely, thereby amplifying its potential impact.
Vulnerability Summary
CVE ID: CVE-2025-9783
Severity: High (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 | 4.0.0-B20211108.1423
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability in the function sub_418030 of the file /boafrm/formParentControl. The ‘submit-url’ argument of the function is susceptible to manipulation, which, when overloaded with data, causes the buffer to overflow. This overflow can potentially lead to erratic system behavior, crashes, or even allow an attacker to execute arbitrary code, leading to system compromise or data leakage.
Conceptual Example Code
Here’s a conceptual example of an HTTP request that could potentially exploit this vulnerability:
POST /boafrm/formParentControl HTTP/1.1
Host: target.example.com
submit-url=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIn the above example, the ‘submit-url’ argument is overloaded with ‘A’ characters, which could potentially trigger the buffer overflow. This is a simplified representation and in a real-world scenario, the attacker would likely use more sophisticated methods to exploit the vulnerability.