Executive Summary
A buffer overflow vulnerability was identified in Tenda HG10 version 300001138, specifically in the formWanRedirect function of the Boa Web Server. This vulnerability can be exploited remotely, and a proof-of-concept exploit has been publicly disclosed. The vulnerability has a CVSS score of 8.8, indicating a high severity level.
Technical Analysis
The vulnerability is classified as a buffer overflow (CWE-119, CWE-120). It affects the formWanRedirect function in the /boaform/formWanRedirect file of the Boa Web Server component in Tenda HG10 300001138. The attack vector involves manipulating the 'if' argument to cause a buffer overflow. This can be done remotely, and the exploit has been publicly disclosed.
How It Gets Exploited
An unauthenticated remote attacker on the same network can exploit this vulnerability. The attacker would send a crafted request to the /boaform/formWanRedirect endpoint, specifically manipulating the 'if' argument to exceed the buffer size. This would trigger a buffer overflow, potentially allowing the attacker to achieve arbitrary code execution as the web service user. The attacker could then pivot to internal systems or exploit other vulnerabilities.
Impact Assessment
The Tenda HG10 version 300001138 is affected by this vulnerability. An attacker could achieve arbitrary code execution, leading to confidentiality, integrity, and availability impacts. The CVSS score of 8.8 indicates a high severity level.
Recommended Actions
To mitigate this vulnerability, users should update Tenda HG10 to a version that patches this issue (currently not specified). In the absence of a patch, blocking access to the /boaform/formWanRedirect endpoint or implementing a Web Application Firewall (WAF) rule to detect and prevent buffer overflow attempts can help reduce the risk. Detection guidance includes monitoring for unusual traffic patterns or anomalies in the /boaform/formWanRedirect endpoint.
Sources
- National Vulnerability Database (NVD)
- Vuldb.com
- Tenda Official Website