CVE-2021-44718 : Security Advisory and Response
Learn about CVE-2021-44718, a wolfSSL vulnerability allowing denial of service attacks. Explore its impact, affected versions, exploitation mechanism, and mitigation steps.
wolfSSL through 5.0.0 allows an attacker to cause a denial of service and infinite loop in the client component by sending crafted traffic from a Machine-in-the-Middle (MITM) position. Learn more about this vulnerability, its impact, technical details, and mitigation steps.
Understanding CVE-2021-44718
This section delves into the vulnerability's nature and impact.
What is CVE-2021-44718?
wolfSSL through version 5.0.0 is susceptible to a denial of service vulnerability wherein an attacker can trigger an infinite loop in the client component by sending malicious traffic from a Machine-in-the-Middle (MITM) stance. This issue stems from the client module's acceptance of TLS messages intended only for TLS servers.
The Impact of CVE-2021-44718
The vulnerability permits an attacker to execute a denial of service attack, potentially disrupting the availability of the affected systems.
Technical Details of CVE-2021-44718
Explore the technical intricacies surrounding this CVE.
Vulnerability Description
By sending specifically crafted traffic, an attacker can induce an infinite loop in the client module of wolfSSL versions up to 5.0.0, leading to a denial of service condition.
Affected Systems and Versions
- Affected Systems: Not applicable
- Affected Versions: All versions up to and including 5.0.0
Exploitation Mechanism
The vulnerability arises from the client module's improper handling of certain TLS messages, allowing unauthorized parties to trigger the infinite loop.
Mitigation and Prevention
Discover the steps to mitigate and prevent exploits related to CVE-2021-44718.
Immediate Steps to Take
- Organizations should upgrade affected installations to version 5.0.1 or newer to mitigate the vulnerability.
- Implement network monitoring to detect and block malicious traffic attempting to exploit the flaw.
Long-Term Security Practices
- Regularly update and patch software to ensure known vulnerabilities are addressed promptly.
- Conduct security assessments and audits to identify and mitigate potential threats proactively.
Patching and Updates
Ensure timely application of security patches and updates to all wolfSSL installations to mitigate the risk posed by CVE-2021-44718.