CVE-2018-5541 Explained : Impact and Mitigation
Learn about CVE-2018-5541 affecting F5 Networks' BIG-IP ASM versions 11.5.1-13.1.0.1, leading to high CPU usage due to excessive parameters in HTTP requests. Find mitigation steps and patching advice here.
A vulnerability in F5 Networks' BIG-IP ASM versions 11.5.1-13.1.0.1 can lead to high CPU usage due to excessive parameters in HTTP requests.
Understanding CVE-2018-5541
This CVE involves a Denial of Service (DoS) risk affecting F5 Networks' BIG-IP ASM.
What is CVE-2018-5541?
The vulnerability causes the BIG-IP ASM bd process to consume high CPU resources when processing HTTP requests with an abnormally large number of parameters.
The Impact of CVE-2018-5541
The vulnerability can result in a Denial of Service condition, potentially disrupting the availability of the affected systems.
Technical Details of CVE-2018-5541
This section delves into the specifics of the vulnerability.
Vulnerability Description
The issue arises in F5 BIG-IP ASM versions 13.0.0-13.1.0.1, 12.1.0-12.1.3.5, 11.6.0-11.6.3.1, and 11.5.1-11.5.6, where processing HTTP requests with numerous parameters triggers excessive CPU usage in the bd process.
Affected Systems and Versions
- Product: BIG-IP (ASM)
- Vendor: F5 Networks, Inc.
- Versions: 13.0.0-13.1.0.1, 12.1.0-12.1.3.5, 11.6.0-11.6.3.1, 11.5.1-11.5.6
Exploitation Mechanism
Attackers can exploit this vulnerability by sending HTTP requests with an unusually high volume of parameters, causing the bd process to experience high CPU utilization.
Mitigation and Prevention
Protecting systems from CVE-2018-5541 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Monitor system performance for signs of high CPU usage
- Apply vendor-supplied patches or updates promptly
- Implement network-level protections to mitigate DoS attacks
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities
- Conduct security assessments and audits to identify and remediate weaknesses
- Educate staff on cybersecurity best practices to prevent and respond to threats
Patching and Updates
F5 Networks provides patches and updates to address the vulnerability. Ensure timely application of these fixes to safeguard systems.