CVE-2021-22276 Explained : Impact and Mitigation
Discover the impact and mitigation strategies for CVE-2021-22276, a Medium severity vulnerability allowing attackers to bypass firmware integrity checks on ABB and Busch-Jaeger System Access Points.
This CVE-2021-22276 advisory pertains to a vulnerability in the System Access Point product by ABB and Busch-Jaeger. The flaw enables a malicious actor to circumvent the firmware integrity check on the free@home System Access Point.
Understanding CVE-2021-22276
This section delves into the nature of the CVE-2021-22276 vulnerability, its impact, technical details, and mitigation strategies.
What is CVE-2021-22276?
The vulnerability allows an attacker to bypass the integrity check of firmware uploaded to the free@home System Access Point.
The Impact of CVE-2021-22276
With a CVSS base score of 6.1 (Medium severity), this vulnerability poses a high availability impact as attackers can upload malicious firmware undetected.
Technical Details of CVE-2021-22276
This section outlines the specifics of the vulnerability, including affected systems, versions, and the exploitation mechanism.
Vulnerability Description
The flaw permits threat actors to upload tampered firmware without triggering the integrity check process.
Affected Systems and Versions
The impacted products include System Access Point versions 2CKA006200A0156, 2CKA006200A0155, 2CKA006220A0240, 2CKA006220A0136, 2CKA006200A0130, 2CKA006200A0105, and 2CKA006200A0071 by ABB, as well as version 2CKA006220A0031 and 2CKA006200A0154 by Busch-Jaeger, all with a version less than or equal to 2.6.3.
Exploitation Mechanism
The vulnerability can be exploited by local attackers requiring user interaction to bypass the integrity check during firmware uploads.
Mitigation and Prevention
Learn how to secure your systems against CVE-2021-22276 and prevent potential exploits.
Immediate Steps to Take
Update to a non-vulnerable firmware version and ensure all firmware uploaded to the System Access Point passes integrity checks.
Long-Term Security Practices
Implement network segmentation, access controls, and regular security updates to mitigate future risks.
Patching and Updates
Stay informed about security patches and firmware updates provided by ABB and Busch-Jaeger to address this vulnerability.