Overview
CVE-2025-4827 is a critical vulnerability identified in TOTOLINK A702R, A3002R, and A3002RU 3.0.0-B20230809.1615. This vulnerability resides in an unknown function of the file /boafrm/formSaveConfig, specifically within the HTTP POST Request Handler. It is significant due to its potential to cause a system compromise or data leakage, impacting the integrity and confidentiality of the system. The vulnerability is triggered by manipulated ‘submit-url’ arguments, resulting in a buffer overflow.
This vulnerability is especially concerning as it can be exploited remotely, and the exploit has been publicly disclosed. Therefore, it is of utmost importance for organizations using the affected TOTOLINK products to apply the necessary patches and follow prescribed mitigation guidance to prevent potential exploitation.
Vulnerability Summary
CVE ID: CVE-2025-4827
Severity: Critical, CVSS score of 8.8
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 stems from improper input validation in the HTTP POST Request Handler of the TOTOLINK firmware. When a malicious user sends a specially crafted HTTP POST request with an overly long ‘submit-url’ argument, it triggers a buffer overflow in the /boafrm/formSaveConfig file. This overflow can allow for the execution of arbitrary code on the system, potentially leading to system compromise and data leakage.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP POST request that sends an overly-long ‘submit-url’ argument:
POST /boafrm/formSaveConfig HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=<insert overly long string here>Please note that this example is purely conceptual and for illustrative purposes only. It is crucial to refrain from using this or similar methods for malicious purposes.