CVE-2021-27217 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-27217, a vulnerability in Yubico yubihsm-shell through version 2.0.3, leading to potential denial of service attacks. Learn about the impact, technical aspects, and mitigation strategies.
This CVE-2021-27217 article provides insights into a vulnerability discovered in the _send_secure_msg() function of Yubico yubihsm-shell through version 2.0.3, potentially leading to a denial of service attack.
Understanding CVE-2021-27217
In this section, we will delve into the details surrounding CVE-2021-27217.
What is CVE-2021-27217?
CVE-2021-27217 is an issue found in the _send_secure_msg() function of Yubico yubihsm-shell through version 2.0.3. It arises due to incorrect validation of an authenticated message length, allowing for client-side denial of service attacks.
The Impact of CVE-2021-27217
The vulnerability in CVE-2021-27217 can be exploited by attackers to crash the running process, resulting in a denial of service situation. This flaw is contained within the Yubico yubihsm-shell project, which is integral to the YubiHSM 2 SDK product.
Technical Details of CVE-2021-27217
This section will provide a deeper look into the technical aspects of CVE-2021-27217.
Vulnerability Description
The issue lies in the failure to properly validate the length field of an authenticated message within the _send_secure_msg() function. This allows for out-of-bounds reads by aes_remove_padding(), potentially crashing the process.
Affected Systems and Versions
The vulnerability impacts Yubico yubihsm-shell versions up to 2.0.3. Users leveraging this version should take precautionary measures.
Exploitation Mechanism
Exploitation of CVE-2021-27217 involves sending a specially crafted authenticated message to trigger out-of-bounds reads and potentially crash the running process.
Mitigation and Prevention
In this section, we will explore strategies to mitigate and prevent exploitation of CVE-2021-27217.
Immediate Steps to Take
Users are advised to update to the latest version of Yubico yubihsm-shell to patch the vulnerability and prevent potential denial of service attacks.
Long-Term Security Practices
It is recommended to regularly monitor for security advisories and apply patches promptly to reduce the risk of exploitation.
Patching and Updates
Stay informed about security updates and implement patching procedures diligently to safeguard systems against vulnerabilities like CVE-2021-27217.