CVE-2019-9640 : What You Need to Know

A problem has been encountered in the EXIF module within PHP versions prior to 7.1.27, 7.2.x prior to 7.2.16, and 7.3.x prior to 7.3.3. Specifically, a flaw has been identified in exif_process_SOFn that leads to an invalid read operation.

Understanding CVE-2019-9640

This CVE describes a vulnerability in the EXIF component of PHP versions before 7.1.27, 7.2.x before 7.2.16, and 7.3.x before 7.3.3.

What is CVE-2019-9640?

This CVE pertains to an issue in the EXIF module of PHP that allows for an invalid read operation in the exif_process_SOFn function.

The Impact of CVE-2019-9640

The vulnerability could be exploited by an attacker to potentially execute arbitrary code or cause a denial of service by triggering the flaw in the affected PHP versions.

Technical Details of CVE-2019-9640

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The vulnerability in the EXIF component of PHP versions prior to 7.1.27, 7.2.x before 7.2.16, and 7.3.x before 7.3.3 allows for an invalid read operation in the exif_process_SOFn function.

Affected Systems and Versions

PHP versions before 7.1.27
PHP 7.2.x versions before 7.2.16
PHP 7.3.x versions before 7.3.3

Exploitation Mechanism

The flaw in exif_process_SOFn can be exploited by an attacker to trigger the invalid read operation, potentially leading to arbitrary code execution or denial of service.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks associated with CVE-2019-9640.

Immediate Steps to Take

Update PHP to versions 7.1.27, 7.2.16, or 7.3.3, which contain fixes for the vulnerability.
Monitor official sources for patches and security advisories related to PHP.

Long-Term Security Practices

Regularly update PHP and other software components to the latest secure versions.
Implement strong input validation and output encoding practices in web applications to mitigate similar vulnerabilities.

Patching and Updates

Apply patches provided by PHP to address the vulnerability.
Stay informed about security updates and advisories from PHP and relevant distribution channels.