Overview
The vulnerability identified as CVE-2025-9813 is a buffer overflow issue that affects Tenda CH22 1.0.0.1. The flaw resides in the function formSetSambaConf of the file /goform/SetSambaConf and can be remotely exploited. This vulnerability is of particular concern due to its high potential for system compromise and data leakage, especially considering that the exploit is publicly available and might be used in real-world attacks.
Vulnerability Summary
CVE ID: CVE-2025-9813
Severity: High (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda CH22 | 1.0.0.1
How the Exploit Works
The exploit works by manipulating the argument samba_userNameSda in the function formSetSambaConf of the file /goform/SetSambaConf, leading to buffer overflow. An attacker can remotely send a specially crafted request to trigger the vulnerability, leading to potential system compromise or data leakage.
Conceptual Example Code
Here is a conceptual example of how an attacker might exploit the vulnerability:
POST /goform/SetSambaConf HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "samba_userNameSda": "A"*1000 } // Buffer overflow by sending a string of 'A's larger than the buffer sizeThis conceptual code sends an HTTP POST request to the vulnerable endpoint, with a payload that attempts to overflow the buffer by sending an excessively long string of ‘A’s as the samba_userNameSda argument.
Mitigation Measures
The recommended course of action to mitigate the risk posed by this vulnerability is to apply the vendor patch as soon as it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation strategy, detecting and blocking attempts to exploit this vulnerability. Organizations should also consider implementing a regular patch management strategy and vulnerability scanning to identify and remediate such vulnerabilities promptly.
