CVE-2019-9511 Explained : Impact and Mitigation
Learn about CVE-2019-9511, a vulnerability in certain HTTP/2 implementations allowing manipulation of window size and stream prioritization, potentially leading to denial of service attacks. Find out the impact, technical details, and mitigation steps.
Certain HTTP/2 implementations have a vulnerability where the window size and stream prioritization can be manipulated, leading to a denial of service attack. The attacker can force the server to store data in very small increments, impacting CPU and memory usage.
Understanding CVE-2019-9511
This CVE involves vulnerabilities in certain HTTP/2 implementations that allow manipulation of window size and stream prioritization, potentially resulting in denial of service attacks.
What is CVE-2019-9511?
- Vulnerability in HTTP/2 implementations allowing manipulation of window size and stream prioritization
- Attack involves sending numerous requests for a specific resource across multiple streams
- Manipulation forces the server to store data in small 1-byte increments
- Impact on CPU usage, memory consumption, or both depends on how efficiently the queued data is managed
The Impact of CVE-2019-9511
- CVSS Base Score: 7.5 (High)
- Attack Vector: Network
- Availability Impact: High
- Attack Complexity: Low
- Scope: Unchanged
- No impact on Confidentiality or Integrity
Technical Details of CVE-2019-9511
This section provides detailed technical information about the vulnerability.
Vulnerability Description
- Vulnerability in HTTP/2 implementations allowing manipulation of window size and stream prioritization
Affected Systems and Versions
- Affected Systems: Not specified
- Affected Versions: Not specified
Exploitation Mechanism
- Attacker sends multiple requests for a specific resource across various streams
- Manipulates window size and stream priority to force server to store data in 1-byte chunks
- Impact on CPU and memory depends on how efficiently the data is queued
Mitigation and Prevention
Protecting systems from CVE-2019-9511 requires immediate steps and long-term security practices.
Immediate Steps to Take
- Update affected systems with patches from vendors
- Monitor network traffic for any suspicious activity
- Implement rate limiting for HTTP/2 requests
Long-Term Security Practices
- Regularly update and patch software and systems
- Conduct security audits and penetration testing
- Educate users and administrators on secure practices
Patching and Updates
- Apply patches provided by vendors to address the vulnerability