CVE-2019-11047 : Vulnerability Insights and Analysis

PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13, and 7.4.0 are vulnerable to a heap-buffer-overflow READ in the PHP EXIF extension when processing image EXIF data.

Understanding CVE-2019-11047

This CVE involves a potential vulnerability in the PHP EXIF extension that could lead to information disclosure or program crashes.

What is CVE-2019-11047?

In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13, and 7.4.0, a flaw in the PHP EXIF extension allows for data injection beyond buffer limits, posing a risk of sensitive data exposure or system crashes.

The Impact of CVE-2019-11047

The vulnerability can be exploited to read past allocated buffer sizes, potentially resulting in information disclosure or program instability.

Technical Details of CVE-2019-11047

PHP versions 7.2.x, 7.3.x, and 7.4.0 are affected by this vulnerability.

Vulnerability Description

The issue arises when the PHP EXIF extension processes EXIF data from images, enabling attackers to exceed buffer limits and potentially access sensitive information.

Affected Systems and Versions

PHP 7.2.x versions below 7.2.26
PHP 7.3.x versions below 7.3.13
PHP 7.4.0

Exploitation Mechanism

Attackers can exploit this vulnerability by supplying malicious data to functions like exif_read_data(), causing buffer overflows and potential data exposure.

Mitigation and Prevention

To address CVE-2019-11047, follow these steps:

Immediate Steps to Take

Update PHP to versions 7.2.26, 7.3.13, or later.
Implement input validation to prevent malicious data injection.

Long-Term Security Practices

Regularly monitor PHP security advisories and apply patches promptly.
Conduct security audits to identify and mitigate similar vulnerabilities.

Patching and Updates

Apply the latest PHP patches and updates to ensure system security and prevent exploitation.