CVE-2018-6332 : Vulnerability Insights and Analysis

A denial-of-service vulnerability in HHVM's Proxygen component could allow an attacker to exhaust server resources, affecting various versions of HHVM.

Understanding CVE-2018-6332

This CVE involves a potential denial-of-service issue in the Proxygen component of HHVM, impacting multiple versions.

What is CVE-2018-6332?

The Proxygen component in HHVM is susceptible to a denial-of-service vulnerability when handling invalid HTTP2 settings, leading to resource exhaustion.

The Impact of CVE-2018-6332

The vulnerability can be exploited by attackers to cause servers running HHVM to consume excessive resources, potentially resulting in service disruption.

Technical Details of CVE-2018-6332

This section provides detailed technical information about the CVE.

Vulnerability Description

The issue arises from how Proxygen in HHVM processes invalid HTTP2 settings, allowing malicious actors to trigger resource depletion.

Affected Systems and Versions

Product: HHVM
Vendor: Facebook
Affected Versions:
3.24.4
3.22.0 (custom version)
3.21.8
Versions less than 3.21.8 (custom)

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted HTTP2 requests to servers running affected versions of HHVM, causing resource exhaustion.

Mitigation and Prevention

Protecting systems from CVE-2018-6332 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Consider disabling HTTP2 support temporarily if feasible.

Long-Term Security Practices

Regularly update HHVM to the latest secure versions.
Implement network-level protections to filter potentially malicious traffic.

Patching and Updates

Facebook has released patches addressing the vulnerability. Ensure timely installation of these updates to mitigate the risk of exploitation.