CVE-2018-20340 : What You Need to Know

Yubico libu2f-host 1.1.6 contains unchecked buffers in the devs.c file, potentially leading to a buffer overflow exploit by a malicious token. This vulnerability could allow an attacker to execute malicious code using a crafted USB device posing as a security token.

Understanding CVE-2018-20340

Unchecked buffers in Yubico libu2f-host 1.1.6 could be exploited by a malicious token to cause a buffer overflow.

What is CVE-2018-20340?

The vulnerability in Yubico libu2f-host 1.1.6 allows attackers to potentially execute malicious code using a specially crafted USB device posing as a security token.

The Impact of CVE-2018-20340

Attackers could exploit unchecked buffers to cause a buffer overflow in the affected library.
Malicious tokens could execute code on a computer using the vulnerable library.
Legitimate YubiKeys are not susceptible to this type of attack.

Technical Details of CVE-2018-20340

Yubico libu2f-host 1.1.6 vulnerability details.

Vulnerability Description

Unchecked buffers in devs.c file could lead to a buffer overflow exploit by a malicious token.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Version: 1.1.6

Exploitation Mechanism

Attackers can use a crafted USB device to masquerade as a security token.
The vulnerability allows execution of malicious code on computers with the affected library.

Mitigation and Prevention

Protecting systems from CVE-2018-20340.

Immediate Steps to Take

Update the Yubico libu2f-host library to a patched version.
Avoid using untrusted USB devices on critical systems.

Long-Term Security Practices

Regularly update software and firmware to patch vulnerabilities.
Implement device authentication mechanisms to prevent unauthorized access.

Patching and Updates

Check for security advisories from Yubico and apply recommended patches promptly.