CVE-2019-11035 : What You Need to Know

PHP EXIF extension in versions 7.1.x before 7.1.28, 7.2.x before 7.2.17, and 7.3.x before 7.3.4 has a vulnerability that can lead to information disclosure or crashes.

Understanding CVE-2019-11035

The PHP EXIF extension in certain versions has a security flaw that could be exploited by attackers.

What is CVE-2019-11035?

The vulnerability in the PHP EXIF extension allows the exif_iif_add_value function to read beyond the allocated buffer, potentially resulting in information disclosure or system crashes.

The Impact of CVE-2019-11035

CVSS Base Score: 4.8 (Medium Severity)
Attack Vector: Network
Attack Complexity: High
Confidentiality Impact: Low
Integrity Impact: None
Availability Impact: Low

Technical Details of CVE-2019-11035

The technical aspects of the vulnerability in PHP EXIF extension.

Vulnerability Description

The issue arises when processing specific files, causing the function to read past the allocated buffer, leading to potential security risks.

Affected Systems and Versions

PHP 7.1.x versions before 7.1.28
PHP 7.2.x versions before 7.2.17
PHP 7.3.x versions before 7.3.4

Exploitation Mechanism

The vulnerability can be exploited by manipulating specific files to trigger the buffer over-read, potentially resulting in information leakage or system instability.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-11035 vulnerability.

Immediate Steps to Take

Update PHP to versions 7.1.28, 7.2.17, or 7.3.4 to mitigate the vulnerability.
Monitor official PHP security advisories for patches and updates.

Long-Term Security Practices

Regularly update PHP and its extensions to the latest secure versions.
Implement secure coding practices to prevent buffer over-read vulnerabilities.

Patching and Updates

Apply patches provided by PHP Group promptly to address the vulnerability and enhance system security.