CVE-2019-6339 : Exploit Details and Defense Strategies

A vulnerability has been identified in Drupal Core versions 7.x before 7.62, 8.6.x before 8.6.6, and 8.5.x before 8.5.9, allowing remote code execution through PHP's phar stream wrapper.

Understanding CVE-2019-6339

This CVE involves a vulnerability in Drupal Core versions that could lead to remote code execution.

What is CVE-2019-6339?

The vulnerability allows remote code execution through PHP's built-in phar stream wrapper when performing file operations on an untrusted phar:// URI.
Certain Drupal code may be conducting file operations on user input that has not been adequately validated, exposing it to this vulnerability.
The exploit is generally mitigated by the need for administrative permission or an uncommon configuration for vulnerable code paths to be accessible.

The Impact of CVE-2019-6339

CVSS Score: 0 (None)
Attack Complexity: High
Privileges Required: High
User Interaction: Required
Vector String: CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:N

Technical Details of CVE-2019-6339

Vulnerability Description

Remote code execution vulnerability in PHP's phar stream wrapper.

Affected Systems and Versions

Drupal Core versions 7.x, 8.6.x, and 8.5.x before specified versions.

Exploitation Mechanism

Vulnerability exploited through untrusted phar:// URI during file operations.

Mitigation and Prevention

Immediate Steps to Take

Update Drupal Core to versions 7.62, 8.6.6, or 8.5.9 to patch the vulnerability.
Validate user input to prevent exposure to the exploit.

Long-Term Security Practices

Regularly update Drupal Core and all associated modules to the latest versions.
Implement secure coding practices to validate and sanitize user input.
Restrict administrative permissions to minimize the impact of potential vulnerabilities.

Patching and Updates

Apply security patches provided by Drupal to address known vulnerabilities.