CVE-2021-27707 : Vulnerability Insights and Analysis
Learn about CVE-2021-27707, a critical Buffer Overflow vulnerability in Tenda G1 and G3 routers, allowing remote code execution. Find out the impact, affected versions, and mitigation steps.
This CVE-2021-27707 article provides detailed information about a Buffer Overflow vulnerability found in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN, allowing remote attackers to execute arbitrary code.
Understanding CVE-2021-27707
This section dives into the specifics of the CVE-2021-27707 vulnerability.
What is CVE-2021-27707?
CVE-2021-27707 is a Buffer Overflow vulnerability present in Tenda G1 and G3 routers, which enables malicious actors to execute arbitrary code by exploiting a specific crafted request.
The Impact of CVE-2021-27707
The impact of this vulnerability is severe as it allows remote attackers to gain unauthorized access and potentially take control of the affected routers.
Technical Details of CVE-2021-27707
In this section, we explore the technical aspects of CVE-2021-27707.
Vulnerability Description
The vulnerability arises due to the 'formDelPortMapping' function in the routers, which directly passes the parameter 'portMappingIndex' to 'strcpy' without proper limits, leading to a buffer overflow.
Affected Systems and Versions
Tenda G1 and G3 routers running firmware version v15.11.0.17(9502)_CN are affected by this vulnerability.
Exploitation Mechanism
Remote attackers can exploit CVE-2021-27707 by sending a specially crafted 'portMappingIndex' request, triggering the buffer overflow and enabling them to execute malicious code.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent exploitation of CVE-2021-27707.
Immediate Steps to Take
Users are advised to update their Tenda G1 and G3 routers to the latest firmware version provided by the vendor to patch the vulnerability.
Long-Term Security Practices
Implementing best security practices such as regular security updates, network segmentation, and access control measures can help prevent future vulnerabilities.
Patching and Updates
Regularly check for firmware updates from Tenda and apply them promptly to ensure the security of your routers.