CVE-2021-31806 Explained : Impact and Mitigation
Uncover details about CVE-2021-31806, a vulnerability in Squid allowing DoS attacks via HTTP Range requests. Learn the impact, technical aspects, and mitigation steps.
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6, making it vulnerable to a Denial of Service attack via HTTP Range request processing.
Understanding CVE-2021-31806
This section delves into the details of CVE-2021-31806, highlighting its impact, technical aspects, and mitigation steps.
What is CVE-2021-31806?
CVE-2021-31806 is a vulnerability found in Squid versions prior to 4.15 and 5.0.6. Exploiting a memory-management bug, it allows attackers to launch Denial of Service attacks through HTTP Range requests.
The Impact of CVE-2021-31806
This vulnerability poses a significant risk to all clients using the proxy, potentially leading to service disruption and downtime due to DoS attacks.
Technical Details of CVE-2021-31806
Explore the specific technical aspects of CVE-2021-31806, including the vulnerability description, affected systems, and exploitation mechanism.
Vulnerability Description
The vulnerability stems from a memory-management bug in Squid versions prior to 4.15 and 5.0.6, enabling attackers to execute DoS attacks via HTTP Range requests.
Affected Systems and Versions
All clients using Squid versions before 4.15 and 5.0.6 are impacted by CVE-2021-31806, regardless of the vendor or product.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted HTTP Range requests to the proxy server, causing a resource exhaustion leading to denial of service.
Mitigation and Prevention
Discover the essential steps to mitigate the risks associated with CVE-2021-31806 and safeguard your systems.
Immediate Steps to Take
- Update Squid to versions 4.15 or 5.0.6 to patch the memory-management bug and prevent DoS attacks via HTTP Range requests.
Long-Term Security Practices
Ensure regular security assessments, implement access controls, and monitor network traffic to detect and respond to potential threats promptly.
Patching and Updates
Stay informed about security advisories from Squid and other vendors, apply security patches promptly, and maintain a robust incident response plan to mitigate risks effectively.