CVE-2019-11039 : Exploit Details and Defense Strategies
Learn about CVE-2019-11039, a PHP vulnerability in iconv_mime_decode_headers() in versions 7.1.x, 7.2.x, and 7.3.x. Understand the impact, affected systems, exploitation, and mitigation steps.
PHP function iconv_mime_decode_headers() in PHP versions 7.1.x before 7.1.30, 7.2.x before 7.2.19, and 7.3.x before 7.3.6 has a vulnerability that can cause an out-of-buffer read due to an integer overflow while parsing MIME headers.
Understanding CVE-2019-11039
This CVE involves an out-of-bounds read vulnerability in PHP versions 7.1.x, 7.2.x, and 7.3.x.
What is CVE-2019-11039?
The PHP function iconv_mime_decode_headers() in versions 7.1.x before 7.1.30, 7.2.x before 7.2.19, and 7.3.x before 7.3.6 has a vulnerability that can cause it to perform an out-of-buffer read. This occurs due to an integer overflow while parsing MIME headers. As a result, sensitive information may be exposed or the system may crash.
The Impact of CVE-2019-11039
- CVSS Base Score: 4.2 (Medium)
- Attack Vector: Network
- Attack Complexity: High
- User Interaction: Required
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: Low
Technical Details of CVE-2019-11039
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in PHP versions 7.1.x, 7.2.x, and 7.3.x allows for an out-of-buffer read due to an integer overflow while parsing MIME headers.
Affected Systems and Versions
- Affected Versions:
- PHP 7.1.30
- PHP 7.2.19
- PHP 7.3.6
- Vendor: PHP Group
Exploitation Mechanism
The vulnerability can be exploited by manipulating MIME headers to trigger the out-of-buffer read.
Mitigation and Prevention
Protecting systems from CVE-2019-11039 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update PHP to the patched versions (7.1.30, 7.2.19, 7.3.6) or newer.
- Monitor for any unusual activities that might indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update PHP and other software to the latest versions.
- Implement network security measures to detect and prevent similar vulnerabilities.
Patching and Updates
- Apply patches provided by PHP Group to address the out-of-bounds read vulnerability.