CVE-2019-3561 Explained : Impact and Mitigation
Learn about CVE-2019-3561 affecting HHVM versions 4.0.4, 4.0.0, 3.30.5, and more. Find mitigation steps and long-term security practices to prevent unauthorized memory access.
A vulnerability in HHVM versions allows unauthorized access to memory outside designated bounds, impacting various versions.
Understanding CVE-2019-3561
What is CVE-2019-3561?
The vulnerability in HHVM's strrpos and strripos functions lacks adequate boundary checks, leading to unauthorized memory access.
The Impact of CVE-2019-3561
This vulnerability affects all supported HHVM versions, including 4.0.3, 3.30.4, and 3.27.7, as well as earlier versions.
Technical Details of CVE-2019-3561
Vulnerability Description
The lack of proper boundary checks in HHVM's strrpos and strripos functions allows unauthorized memory access beyond designated bounds.
Affected Systems and Versions
- HHVM 4.0.4
- HHVM 4.0.0 (custom)
- HHVM 3.30.5
- HHVM 3.30.0 (custom)
- HHVM 3.27.8
- HHVM versions less than 3.27.8 (custom)
Exploitation Mechanism
The vulnerability permits attackers to access memory outside the intended boundaries, potentially leading to unauthorized data exposure or system compromise.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches provided by Facebook for affected HHVM versions.
- Monitor vendor updates and security advisories for further guidance.
Long-Term Security Practices
- Regularly update HHVM to the latest secure versions.
- Implement secure coding practices to prevent memory-related vulnerabilities.
Patching and Updates
- Facebook has released patches for the affected HHVM versions to address this vulnerability.