CVE-2019-11045 : What You Need to Know
Learn about CVE-2019-11045 affecting PHP DirectoryIterator class in versions 7.2.x, 7.3.x, and 7.4.0. Find mitigation steps and long-term security practices to prevent exploitation.
The PHP DirectoryIterator class in PHP versions 7.2.x before 7.2.26, 7.3.x before 7.3.13, and 7.4.0 has a vulnerability where it recognizes filenames containing the \0 byte as terminating at that byte, potentially leading to security risks.
Understanding CVE-2019-11045
What is CVE-2019-11045?
The CVE-2019-11045 vulnerability affects the PHP DirectoryIterator class in specific PHP versions, allowing filenames with a null byte to be treated as terminating at that byte.
The Impact of CVE-2019-11045
This vulnerability may pose security risks, especially in applications that perform path checks to determine code access permissions.
Technical Details of CVE-2019-11045
Vulnerability Description
In PHP versions 7.2.x before 7.2.26, 7.3.x before 7.3.13, and 7.4.0, the DirectoryIterator class accepts filenames with embedded \0 byte and treats them as terminating at that byte, potentially leading to security vulnerabilities.
Affected Systems and Versions
- PHP 7.2.x before 7.2.26
- PHP 7.3.x before 7.3.13
- PHP 7.4.0
Exploitation Mechanism
The vulnerability allows malicious actors to manipulate filenames containing the null byte to potentially bypass security checks and gain unauthorized access.
Mitigation and Prevention
Immediate Steps to Take
- Update PHP to versions 7.2.26, 7.3.13, or newer to mitigate the vulnerability.
- Review and restrict access permissions within applications to minimize the impact of potential exploits.
Long-Term Security Practices
- Regularly monitor and apply security patches and updates to PHP and related software components.
- Implement secure coding practices to prevent similar vulnerabilities in the future.
Patching and Updates
Ensure timely installation of security updates provided by PHP Group to address CVE-2019-11045.