CVE-2019-3570 : What You Need to Know

HHVM, developed by Facebook, is affected by a vulnerability that could lead to heap corruption when using the scrypt_enc() function with manipulated parameters. This could result in information disclosure, memory overwrite, or crashes of the HHVM process.

Understanding CVE-2019-3570

This CVE involves a heap-based buffer overflow vulnerability in HHVM.

What is CVE-2019-3570?

The vulnerability arises from the manipulation of parameters (N, r, and p) in the scrypt_enc() function, allowing attackers to cause heap corruption. If the function's output is used in a context where it is re-run with the same parameters, it can lead to severe consequences.

The Impact of CVE-2019-3570

The vulnerability in HHVM could potentially result in information disclosure, memory overwrite, or crashes of the HHVM process, posing a significant risk to system security.

Technical Details of CVE-2019-3570

HHVM's vulnerability details and affected systems.

Vulnerability Description

The use of the scrypt_enc() function in HHVM can lead to heap corruption due to manipulated parameters (N, r, and p), potentially causing severe security issues.

Affected Systems and Versions

Versions affected include 4.3.0, 4.4.0, 4.5.0, 4.6.0, 4.7.0, 4.8.0, 3.30.5 and below, as well as all versions within the 4.0, 4.1, and 4.2 series.

Exploitation Mechanism

The vulnerability occurs when attackers manipulate the parameters of the scrypt_enc() function, leading to heap corruption and subsequent security risks.

Mitigation and Prevention

Steps to mitigate and prevent the exploitation of CVE-2019-3570.

Immediate Steps to Take

Update HHVM to a patched version that addresses the vulnerability.
Monitor for any unusual activity that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement strong access controls and monitoring to detect and prevent unauthorized access.

Patching and Updates

Apply patches provided by Facebook for HHVM to fix the vulnerability and enhance system security.