CVE-2019-19826 Explained : Impact and Mitigation

The Views Dynamic Fields module in Drupal version 7.x-1.0-alpha4 is vulnerable to insecure unserialize calls, potentially leading to PHP object injection and allowing attackers to execute arbitrary code or perform file deletion.

Understanding CVE-2019-19826

This CVE involves a high severity vulnerability in the Views Dynamic Fields module for Drupal, which can have significant impacts on the security of affected systems.

What is CVE-2019-19826?

The vulnerability in the Views Dynamic Fields module allows for insecure unserialize calls in a specific file, enabling PHP object injection. This injection involves objects named field_names and Archive_Tar, which could be exploited by attackers for malicious activities.

The Impact of CVE-2019-19826

The vulnerability has a high CVSS base score of 8.1, indicating a severe impact on confidentiality, integrity, and availability of affected systems. The attack complexity is high, and no special privileges are required for exploitation.

Technical Details of CVE-2019-19826

The technical aspects of this CVE provide insights into the vulnerability's description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from insecure unserialize calls in the handlers/views_handler_filter_dynamic_fields.inc file, leading to PHP object injection involving field_names and Archive_Tar objects.

Affected Systems and Versions

Product: Views Dynamic Fields module
Vendor: N/A
Version: 7.x-1.0-alpha4

Exploitation Mechanism

Attackers can exploit this vulnerability to achieve PHP object injection, potentially resulting in file deletion or arbitrary code execution.

Mitigation and Prevention

Protecting systems from CVE-2019-19826 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the Views Dynamic Fields module to a secure version that addresses the vulnerability.
Monitor system logs for any suspicious activities that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch all software components to prevent known vulnerabilities.
Implement strong access controls and least privilege principles to limit the impact of potential attacks.

Patching and Updates

Apply security patches provided by Drupal for the Views Dynamic Fields module to mitigate the vulnerability effectively.