Overview
In today’s world, cybersecurity is of paramount importance and vulnerabilities left unpatched can result in devastating consequences. One such vulnerability, CVE-2025-11117, has been identified in Tenda CH22 1.0.0.1. This is a high-risk vulnerability that affects the function formWrlExtraGet of the file /goform/GstDhcpSetSer. Exploiting this vulnerability could potentially lead to system compromise or data leakage. This vulnerability is particularly concerning due to the fact that it can be exploited remotely, posing a significant risk to any system running the affected software.
Vulnerability Summary
CVE ID: CVE-2025-11117
Severity: High (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage.
Affected Products
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Product | Affected Versions
Tenda | CH22 1.0.0.1
How the Exploit Works
The exploitation of this vulnerability revolves around the manipulation of the argument ‘dips’ in the function formWrlExtraGet of the file /goform/GstDhcpSetSer. The vulnerability is triggered when overly large data is input into the ‘dips’ argument, causing a buffer overflow. Buffer overflow vulnerabilities occur when the volume of data exceeds the storage capacity of the buffer, causing the extra information to overflow into adjacent storage spaces. This can corrupt or overwrite the data stored in these spaces, causing erratic program behavior, including memory access errors, incorrect results, program termination or a breach of system security.
Conceptual Example Code
The following pseudo-code illustrates a conceptual example of how this vulnerability might be exploited:
POST /goform/GstDhcpSetSer HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
dips=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In the above code, the ‘A’s represent an overly long string that is the input used to trigger the buffer overflow. This input would need to be crafted to suit the specific system being targeted.
Mitigation
The most effective way to protect against this vulnerability is to apply the latest patches and updates provided by the vendor. In the absence of a patch, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure by identifying and blocking malicious traffic. However, these are not foolproof and should not be relied upon as a long-term solution. It is also recommended to regularly monitor system logs for any suspicious activity.
