CVE-2021-31807 : Vulnerability Insights and Analysis
Learn about CVE-2021-31807, an integer overflow vulnerability in Squid versions before 4.15 and 5.x before 5.0.6, allowing remote attackers to launch Denial of Service attacks. Find mitigation steps and preventive measures here.
An integer overflow vulnerability was discovered in Squid versions before 4.15 and 5.x before 5.0.6, allowing a remote server to perform Denial of Service attacks when responding to HTTP Range requests.
Understanding CVE-2021-31807
This section will cover the details of the CVE-2021-31807 vulnerability.
What is CVE-2021-31807?
The CVE-2021-31807 vulnerability exists in Squid versions prior to 4.15 and 5.x before 5.0.6, enabling a remote server to trigger a DoS attack by exploiting an integer overflow issue during HTTP Range requests.
The Impact of CVE-2021-31807
The impact of this vulnerability is significant as it allows a remote attacker to disrupt the normal functioning of the Squid server, potentially leading to service unavailability.
Technical Details of CVE-2021-31807
This section will delve into the technical aspects of CVE-2021-31807.
Vulnerability Description
The vulnerability arises from an integer overflow problem in Squid, which can be exploited by a malicious remote server to cause a Denial of Service condition.
Affected Systems and Versions
All Squid versions prior to 4.15 and 5.x before 5.0.6 are vulnerable to CVE-2021-31807, putting them at risk of DoS attacks.
Exploitation Mechanism
By sending specially crafted HTTP Range requests, a remote server can trigger the integer overflow issue in Squid and disrupt its normal operation.
Mitigation and Prevention
In this section, we will discuss how to mitigate and prevent CVE-2021-31807.
Immediate Steps to Take
Users are advised to update their Squid installations to versions 4.15 or 5.0.6 to address the integer overflow vulnerability and prevent potential DoS attacks.
Long-Term Security Practices
Maintaining an updated and secure Squid deployment, along with regular security assessments, can help prevent and detect similar vulnerabilities in the future.
Patching and Updates
Regularly monitoring official security advisories and promptly applying patches provided by Squid developers is crucial to ensuring the security of the system.