CVE-2019-11049 : Exploit Details and Defense Strategies
Learn about CVE-2019-11049 affecting PHP mail() function on Windows systems. Find details on impact, affected versions, and mitigation steps to secure your environment.
PHP mail() function vulnerability affecting Windows systems.
Understanding CVE-2019-11049
Vulnerability in PHP versions 7.3.x < 7.3.13 and 7.4.0 on Windows.
What is CVE-2019-11049?
- PHP mail() function issue on Windows systems allowing external control of headers.
- Vulnerability caused by a mistake in a specific commit, leading to memory location freeing.
The Impact of CVE-2019-11049
- CVSS v3.1 Base Score: 6.5 (Medium Severity)
- Attack Complexity: High, Attack Vector: Network
- Availability Impact: High, Integrity Impact: Low
Technical Details of CVE-2019-11049
Vulnerability specifics and affected systems.
Vulnerability Description
- Custom headers in lowercase can result in double-freeing memory locations.
Affected Systems and Versions
- Platforms: Windows
- PHP Versions: 7.3.x < 7.3.13, 7.4.x < 7.4.1
Exploitation Mechanism
- Issue arises when using the mail() function with externally controlled headers.
Mitigation and Prevention
Protective measures and steps to address the vulnerability.
Immediate Steps to Take
- Update PHP to versions 7.3.13 or 7.4.1 to mitigate the vulnerability.
- Avoid using custom headers with the mail() function.
Long-Term Security Practices
- Regularly monitor PHP security advisories and apply patches promptly.
- Implement secure coding practices to prevent similar vulnerabilities.
Patching and Updates
- Refer to official PHP security advisories for patch releases and update instructions.