CVE-2021-22565 : What You Need to Know
CVE-2021-22565 allows attackers to expire verification codes, impeding TEK uploads for exposure notifications. Upgrade to V1.1.2+ for mitigation. Impact: MEDIUM.
A vulnerability has been identified in Google Exposure-notifications-verification-server that could allow an attacker to render verification codes unusable, preventing patients from uploading TEKs to generate exposure notifications.
Understanding CVE-2021-22565
This CVE refers to the issue of insufficient granularity of access control in the GAEN Notification Server.
What is CVE-2021-22565?
The vulnerability in the Exposure Notification server could be exploited by an attacker to prematurely expire verification codes, hindering patients from uploading their Temporary Exposure Keys (TEKs) to create exposure notifications. Updating to version V1.1.2 or higher is advised.
The Impact of CVE-2021-22565
The impact of this CVE is rated as MEDIUM with a CVSS base score of 6.5. It has a low attack complexity and is network-based, affecting availability and integrity but not compromising data confidentiality.
Technical Details of CVE-2021-22565
This section provides technical details related to the vulnerability.
Vulnerability Description
The vulnerability arises from improper access control, enabling an attacker to disrupt the verification process and affect the functionality of the Exposure Notification server.
Affected Systems and Versions
Google Exposure-notifications-verification-server versions less than 1.1.2 are affected by this vulnerability.
Exploitation Mechanism
The attacker can exploit the vulnerability by manipulating verification codes to prevent patients from successfully uploading their TEKs.
Mitigation and Prevention
Protecting your systems from CVE-2021-22565 is crucial to ensure the security and functionality of the Exposure Notification server.
Immediate Steps to Take
Upgrade to version 1.1.2 or above of the Exposure Notification server to mitigate the risk of exploitation.
Long-Term Security Practices
Implement robust access controls, regular security updates, and monitoring to enhance the overall security posture of your systems.
Patching and Updates
Stay informed about security advisories and releases related to the Exposure Notification server to promptly apply patches and updates.