CVE-2020-1900 : What You Need to Know

This CVE article discusses a vulnerability in HHVM from Facebook affecting multiple versions.

Understanding CVE-2020-1900

HHVM versions 4.32.3 to 4.62.0 are affected by an issue related to dynamic properties and array resizing.

What is CVE-2020-1900?

The vulnerability arises when unserializing objects with dynamic properties in HHVM, impacting versions 4.32.3 to 4.62.0.

The Impact of CVE-2020-1900

Failure to pre-reserve the full size of dynamic arrays can lead to array resizing, resulting in invalidated references.

Technical Details of CVE-2020-1900

This section provides insights into the vulnerability regarding HHVM versions and affected systems.

Vulnerability Description

HHVM failed to pre-reserve the full size of dynamic property arrays before insertion, affecting versions 4.32.3 to 4.62.0.

Affected Systems and Versions

HHVM versions 4.32.3 to 4.62.0 are impacted, with specific versions like 4.57.0 and 4.58.0 being affected.

Exploitation Mechanism

Exploitation of this vulnerability involves unserializing objects with dynamic properties, triggering array resizing.

Mitigation and Prevention

Learn about immediate steps and long-term practices to safeguard systems against CVE-2020-1900.

Immediate Steps to Take

Update HHVM to version 4.62.1 or newer to mitigate the vulnerability.
Review and sanitize input to prevent arbitrary object unserialization.

Long-Term Security Practices

Regularly update HHVM to the latest version to address security vulnerabilities.
Implement strict input validation and sanitization procedures to prevent similar issues.

Patching and Updates

Apply patches released by Facebook for HHVM to address the vulnerability and enhance system security.