CVE-2018-6335 : What You Need to Know

A vulnerability in HHVM versions could lead to denial-of-service attacks when handling HTTP2 requests.

Understanding CVE-2018-6335

This CVE involves a specific issue in HHVM versions that could potentially result in denial-of-service attacks.

What is CVE-2018-6335?

When parsing priority metadata, encountering a malformed h2 frame in HHVM versions can trigger a 'std::out_of_range' exception, potentially leading to denial-of-service attacks.

The Impact of CVE-2018-6335

The vulnerability affects all versions of HHVM (3.25.3, 3.25.0, 3.24.7, 3.22.0, 3.21.11, and earlier) utilizing the proxygen server for handling HTTP2 requests.

Technical Details of CVE-2018-6335

This section provides more technical insights into the CVE.

Vulnerability Description

A malformed h2 frame in HHVM versions can trigger a 'std::out_of_range' exception, potentially causing denial-of-service.

Affected Systems and Versions

Product: HHVM
Vendor: Facebook
Affected Versions: 3.25.3, 3.25.0, 3.24.7, 3.22.0, 3.21.11, and earlier

Exploitation Mechanism

The vulnerability arises when parsing priority metadata and encountering a malformed h2 frame, leading to the 'std::out_of_range' exception.

Mitigation and Prevention

Protecting systems from CVE-2018-6335 is crucial to prevent denial-of-service attacks.

Immediate Steps to Take

Update HHVM to a patched version that addresses the vulnerability.
Monitor network traffic for any suspicious activity.
Implement proper input validation mechanisms.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Conduct security audits and penetration testing to identify and address potential weaknesses.

Patching and Updates

Facebook has released patches for affected versions of HHVM to address the vulnerability.