CVE-2021-20156 Explained : Impact and Mitigation
Learn about CVE-2021-20156, a security flaw in Trendnet AC2600 TEW-827DRU version 2.08B01 allowing unauthorized firmware updates. Understand the impact and mitigation strategies.
This article provides detailed information about CVE-2021-20156, a vulnerability found in Trendnet AC2600 TEW-827DRU version 2.08B01 that could lead to unauthorized firmware updates.
Understanding CVE-2021-20156
CVE-2021-20156 is a vulnerability identified in the Trendnet AC2600 TEW-827DRU router, specifically affecting version 2.08B01. The flaw involves an improper access control configuration that enables the installation of potentially malicious firmware without verification.
What is CVE-2021-20156?
The vulnerability in Trendnet AC2600 TEW-827DRU version 2.08B01 allows attackers to upload and execute unauthorized firmware updates without proper validation. This includes the risk of receiving malicious firmware through automated update checks.
The Impact of CVE-2021-20156
If exploited, CVE-2021-20156 permits threat actors to deceive the device into accepting fraudulent firmware updates, compromising the security and integrity of the router. Attackers can impersonate update servers and deliver harmful firmware without detection.
Technical Details of CVE-2021-20156
The technical aspects of CVE-2021-20156 include:
Vulnerability Description
The vulnerability arises from an inadequately configured access control mechanism in Trendnet AC2600 TEW-827DRU version 2.08B01, enabling unauthorized firmware updates.
Affected Systems and Versions
Trendnet AC2600 TEW-827DRU routers running version 2.08B01 are susceptible to this security flaw due to the lack of proper signature validation for firmware updates.
Exploitation Mechanism
Threat actors can exploit CVE-2021-20156 by presenting malicious firmware as legitimate updates, bypassing the device's verification process and potentially compromising its operation.
Mitigation and Prevention
To address CVE-2021-20156, the following steps are recommended:
Immediate Steps to Take
Users should disable automated firmware updates and manually verify the authenticity of updates to prevent unauthorized installations.
Long-Term Security Practices
Implement network segmentation, change default passwords, and regularly monitor for suspicious activities to enhance overall security posture.
Patching and Updates
Vendor patches and security updates should be promptly applied to mitigate the vulnerability and protect the device from potential exploits.