CVE-2019-11046 Explained : Impact and Mitigation

PHP bcmath extension functions in certain PHP versions have a vulnerability that could lead to data exposure due to a buffer underflow.

Understanding CVE-2019-11046

This CVE involves a vulnerability in PHP versions 7.2.x, 7.3.x, and 7.4.0 that could allow unauthorized access to sensitive data.

What is CVE-2019-11046?

The PHP bcmath extension functions in specific PHP versions have a vulnerability that may result in accessing data beyond allocated memory space, potentially exposing sensitive information.

The Impact of CVE-2019-11046

CVSS Base Score: 3.7 (Low Severity)
Attack Vector: Network
Attack Complexity: High
Confidentiality Impact: Low
Integrity Impact: None
Privileges Required: None
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Technical Details of CVE-2019-11046

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows for accessing data beyond allocated memory space when non-ASCII numeric characters are provided as input, potentially exposing sensitive information.

Affected Systems and Versions

Affected Versions: PHP 7.2.x prior to 7.2.26, 7.3.x prior to 7.3.13, and 7.4.0
Affected Systems: Certain systems, such as Windows

Exploitation Mechanism

The vulnerability can be exploited by supplying a string with non-ASCII numeric characters, tricking the PHP bcmath extension functions into reading beyond the allocated space.

Mitigation and Prevention

Protect your systems from CVE-2019-11046 by following these steps:

Immediate Steps to Take

Update PHP to versions 7.2.26, 7.3.13, or newer
Monitor for any unauthorized access or data exposure

Long-Term Security Practices

Regularly update PHP and other software to the latest versions
Implement secure coding practices to prevent buffer underflow vulnerabilities

Patching and Updates

Apply security patches provided by PHP Group