CVE-2019-11050 : What You Need to Know
Learn about CVE-2019-11050 affecting PHP versions 7.2.x, 7.3.x, and 7.4.0. Understand the impact, technical details, and mitigation steps for this vulnerability.
PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13, and 7.4.0 are vulnerable to a potential use-after-free vulnerability in the PHP EXIF extension. This vulnerability could allow an attacker to cause information disclosure or system crashes.
Understanding CVE-2019-11050
In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13, and 7.4.0, a vulnerability exists in the PHP EXIF extension that could lead to information disclosure or system crashes.
What is CVE-2019-11050?
When the exif_read_data() function in PHP processes EXIF information from an image, it may read beyond the allocated buffer, potentially resulting in information disclosure or system crashes.
The Impact of CVE-2019-11050
- CVSS Base Score: 4.8 (Medium)
- Attack Vector: Network
- Attack Complexity: High
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: Low
Technical Details of CVE-2019-11050
In-depth technical information about the vulnerability.
Vulnerability Description
The vulnerability arises when the PHP EXIF extension processes EXIF data, allowing attackers to supply data that can lead to buffer overflows, potentially resulting in information disclosure or system crashes.
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 providing malicious data to the exif_read_data() function, causing it to read past the allocated buffer.
Mitigation and Prevention
Protecting systems from CVE-2019-11050.
Immediate Steps to Take
- Update PHP to versions 7.2.26, 7.3.13, or later.
- Apply patches provided by PHP Group.
- Monitor for any unusual activities on PHP applications.
Long-Term Security Practices
- Regularly update PHP and other software components.
- Implement secure coding practices to prevent buffer overflows.
- Conduct security audits and penetration testing.
Patching and Updates
Ensure timely installation of security patches released by PHP Group to address the vulnerability.