CVE-2019-11935 : What You Need to Know
Learn about CVE-2019-11935, a vulnerability in HHVM versions allowing unauthorized memory access. Find mitigation steps and long-term security practices here.
An issue has been identified in HHVM versions before 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, and versions 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1, where inadequate boundary checks during the processing of a string in mb_ereg_replace could potentially allow unauthorized access to memory beyond its limits.
Understanding CVE-2019-11935
This CVE identifies a vulnerability in HHVM that could lead to unauthorized access to memory due to insufficient boundary checks.
What is CVE-2019-11935?
CVE-2019-11935 is a security vulnerability found in HHVM versions, potentially allowing unauthorized access to memory beyond its limits.
The Impact of CVE-2019-11935
The vulnerability could be exploited to gain unauthorized access to memory, posing a risk of sensitive data exposure and system compromise.
Technical Details of CVE-2019-11935
This section provides technical details about the vulnerability.
Vulnerability Description
The issue arises from inadequate boundary checks during the processing of a string in mb_ereg_replace, enabling potential unauthorized memory access.
Affected Systems and Versions
- HHVM versions before 3.30.12
- All versions between 4.0.0 and 4.8.5
- All versions between 4.9.0 and 4.23.1
- Versions 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1
Exploitation Mechanism
The vulnerability allows attackers to exploit inadequate boundary checks in string processing, leading to unauthorized memory access.
Mitigation and Prevention
Protect your systems from CVE-2019-11935 with the following steps:
Immediate Steps to Take
- Apply patches provided by Facebook for affected HHVM versions.
- Monitor for any unauthorized access or unusual system behavior.
Long-Term Security Practices
- Regularly update HHVM to the latest secure versions.
- Implement secure coding practices to prevent similar vulnerabilities.
Patching and Updates
- Stay informed about security updates from Facebook for HHVM.
- Apply patches promptly to mitigate the risk of unauthorized memory access.