CVE-2019-11034 : Exploit Details and Defense Strategies
Learn about CVE-2019-11034, a vulnerability in PHP EXIF extension versions 7.1.x, 7.2.x, and 7.3.x. Understand the impact, affected systems, exploitation mechanism, and mitigation steps.
The PHP EXIF extension in versions 7.1.x, 7.2.x, and 7.3.x may read beyond the buffer, potentially leading to information exposure or system crashes.
Understanding CVE-2019-11034
This CVE involves a vulnerability in the PHP EXIF extension that could be exploited to read past the allocated buffer, potentially causing information disclosure or system crashes.
What is CVE-2019-11034?
The PHP EXIF extension in versions 7.1.x (below 7.1.28), 7.2.x (below 7.2.17), and 7.3.x (below 7.3.4) may encounter issues when processing specific files, leading to potential buffer over-read.
The Impact of CVE-2019-11034
- 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-2019-11034
Vulnerability Description
The vulnerability allows the PHP EXIF extension to read beyond the designated buffer, potentially exposing sensitive information or causing system instability.
Affected Systems and Versions
- PHP versions 7.1.x (below 7.1.28)
- PHP versions 7.2.x (below 7.2.17)
- PHP versions 7.3.x (below 7.3.4)
Exploitation Mechanism
The issue occurs in the exif_process_IFD_TAG function, where processing certain files can lead to reading past the allocated buffer.
Mitigation and Prevention
Immediate Steps to Take
- Update PHP to versions 7.1.28, 7.2.17, or 7.3.4 to mitigate the vulnerability.
- Monitor vendor advisories for patches and apply them promptly.
Long-Term Security Practices
- Regularly update PHP and other software to the latest versions.
- Implement secure coding practices to prevent buffer over-read vulnerabilities.
Patching and Updates
- Refer to vendor advisories and security alerts for patch availability and apply them as soon as they are released.