CVE-2021-40818 : Security Advisory and Response

This CVE-2021-40818 article provides detailed information about a buffer overflow vulnerability in Glewlwyd SSO server.

Understanding CVE-2021-40818

This section explains the vulnerability and its impact.

What is CVE-2021-40818?

scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 experiences a buffer overflow during FIDO2 signature validation in webauthn registration.

The Impact of CVE-2021-40818

The vulnerability could allow an attacker to execute arbitrary code or crash the application by sending specially crafted requests.

Technical Details of CVE-2021-40818

This section dives into the technical aspects of the vulnerability.

Vulnerability Description

Glewlwyd SSO server through 2.5.3 is prone to a buffer overflow vulnerability.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: All versions up to 2.5.3

Exploitation Mechanism

The vulnerability arises during FIDO2 signature validation in webauthn registration, where an attacker can exploit it by crafting malicious requests.

Mitigation and Prevention

Learn how to address and prevent the CVE-2021-40818 vulnerability.

Immediate Steps to Take

Apply the patch provided by the vendor immediately.
Restrict network access to vulnerable systems.
Monitor for any unusual activities on the network.

Long-Term Security Practices

Regularly update and patch systems to prevent future vulnerabilities.
Conduct security training to educate users on identifying phishing and other attack vectors.

Patching and Updates

Ensure all systems running Glewlwyd SSO server are up to date with the latest patches to mitigate the buffer overflow vulnerability.