CVE-2019-11925 : What You Need to Know
Learn about CVE-2019-11925, a security flaw in HHVM versions allowing unauthorized memory access. Find out affected systems, exploitation risks, and mitigation steps.
A security vulnerability in HHVM versions could allow unauthorized access to memory due to insufficient boundary checks in the GD extension when processing JPEG input.
Understanding CVE-2019-11925
This CVE involves a risk of memory access beyond its boundaries in HHVM versions.
What is CVE-2019-11925?
The vulnerability arises from inadequate boundary checks in the GD extension while handling JPEG input, potentially leading to unauthorized memory access.
The Impact of CVE-2019-11925
The security flaw affects various versions of HHVM, potentially allowing attackers to exploit the vulnerability and gain unauthorized access to memory.
Technical Details of CVE-2019-11925
This section provides detailed technical insights into the CVE.
Vulnerability Description
Insufficient boundary checks in the GD extension processing the JPEG APP12 block marker could enable malicious actors to access memory outside its bounds.
Affected Systems and Versions
- HHVM versions prior to 3.30.9
- All versions between 4.0.0 and 4.8.3
- All versions between 4.9.0 and 4.15.2
- Versions 4.16.0 to 4.16.3, 4.17.0 to 4.17.2, 4.18.0 to 4.18.1, 4.19.0, and 4.20.0 to 4.20.1
Exploitation Mechanism
The vulnerability can be exploited by crafting a malicious invalid JPEG input to trigger the insufficient boundary checks in the GD extension.
Mitigation and Prevention
Protect your systems from CVE-2019-11925 with these strategies.
Immediate Steps to Take
- Apply patches provided by HHVM promptly.
- Monitor security advisories for updates and follow recommended actions.
- Implement network security measures to detect and block potential attacks.
Long-Term Security Practices
- Regularly update HHVM to the latest secure versions.
- Conduct security audits and penetration testing to identify vulnerabilities.
- Educate users and administrators on secure coding practices and threat awareness.
Patching and Updates
- Stay informed about security updates and patches released by HHVM.
- Ensure timely application of patches to mitigate the risk of exploitation.