Description
A security vulnerability has been detected in Tenda CH22 up to 1.0.0.1. This issue affects the function formWrlsafeset of the file /goform/AdvSetWrlsafeset of the component HTTP Request Handler. The manipulation of the argument mit_ssid_index leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-31856
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2025-31856 affects the Tenda CH22 device up to version 1.0.0.1. The issue resides in the formWrlsafeset function within the /goform/AdvSetWrlsafeset file of the HTTP Request Handler component. The manipulation of the mit_ssid_index argument results in a stack-based buffer overflow. This vulnerability is severe, with a CVSS base score of 9.3, indicating a critical risk.
CVSS Vector Breakdown:
- AV:N (Network): The vulnerability can be exploited remotely over the network.
- AC:L (Low): The attack complexity is low, meaning it does not require specialized conditions.
- AT:N (None): No authentication is required to exploit the vulnerability.
- PR:N (None): No privileges are required.
- UI:N (None): No user interaction is required.
- VC:H (High): Confidentiality impact is high.
- VI:H (High): Integrity impact is high.
- VA:H (High): Availability impact is high.
- SC:N (None): Scope change is not applicable.
- SI:N (None): Scope integrity is not applicable.
- SA:N (None): Scope availability is not applicable.
- E:P (Proof of Concept): Exploit code is publicly available.
2. Potential Attack Vectors and Exploitation Methods
Given the nature of the vulnerability, potential attack vectors include:
- Remote Exploitation: An attacker can remotely exploit the vulnerability by sending crafted HTTP requests to the affected device.
- Buffer Overflow: The attacker can manipulate the
mit_ssid_indexargument to cause a stack-based buffer overflow, leading to arbitrary code execution. - Public Exploit: The availability of a public exploit increases the likelihood of attacks, as malicious actors can easily obtain and use the exploit code.
3. Affected Systems and Software Versions
The vulnerability affects the following systems:
- Tenda CH22 version 1.0.0.0
- Tenda CH22 version 1.0.0.1
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Patch Management: Ensure that all affected devices are updated to a patched version as soon as it becomes available.
- Network Segmentation: Isolate affected devices from critical networks to limit the potential impact of an exploit.
- Firewall Rules: Implement strict firewall rules to restrict access to the affected devices.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity and potential exploitation attempts.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues proactively.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using Tenda CH22 devices. The potential for remote exploitation and the availability of a public exploit increase the likelihood of widespread attacks. This underscores the importance of timely patching and robust security measures to protect against such threats.
6. Technical Details for Security Professionals
Vulnerability Details:
- Function Affected:
formWrlsafeset - File Affected:
/goform/AdvSetWrlsafeset - Component: HTTP Request Handler
- Argument Manipulated:
mit_ssid_index - Type of Vulnerability: Stack-based buffer overflow
Exploitation Steps:
- Identify Target: Locate the Tenda CH22 device on the network.
- Craft Request: Create a malicious HTTP request targeting the
formWrlsafesetfunction. - Manipulate Argument: Modify the
mit_ssid_indexargument to trigger the buffer overflow. - Execute Payload: Inject and execute arbitrary code on the affected device.
References:
Conclusion: The vulnerability EUVD-2025-31856 in Tenda CH22 devices is critical and requires immediate attention. Organizations should prioritize patching affected devices and implement robust security measures to mitigate the risk of exploitation. The availability of a public exploit heightens the urgency for proactive defense strategies.