CVE-2021-3672 : Vulnerability Insights and Analysis
Learn about CVE-2021-3672, a flaw in c-ares library allowing potential Domain Hijacking. Read about impact, affected systems, exploitation, and mitigation steps.
A flaw was found in c-ares library that can lead to potential Domain Hijacking due to missing input validation check of host names returned by DNS. This vulnerability can compromise confidentiality, integrity, and system availability.
Understanding CVE-2021-3672
This section provides insights into the CVE-2021-3672 vulnerability.
What is CVE-2021-3672?
The CVE-2021-3672 vulnerability involves a flaw in the c-ares library, resulting from missing input validation checks of host names returned by DNS. This can lead to the output of incorrect hostnames, potentially enabling Domain Hijacking.
The Impact of CVE-2021-3672
The highest threat posed by CVE-2021-3672 is to confidentiality, integrity, and system availability. Attackers exploiting this vulnerability can compromise sensitive data and disrupt system operations.
Technical Details of CVE-2021-3672
In this section, we delve into the technical aspects of CVE-2021-3672.
Vulnerability Description
The vulnerability in c-ares library, particularly in version 1.17.2, allows malicious actors to manipulate DNS responses and potentially redirect traffic to unauthorized servers, leading to Domain Hijacking.
Affected Systems and Versions
The c-ares version 1.17.2 is confirmed to be affected by CVE-2021-3672. Organizations using this specific version are at risk of exploitation and should take immediate action to mitigate the vulnerability.
Exploitation Mechanism
Exploiting CVE-2021-3672 involves sending crafted DNS responses to the target system, tricking it into processing incorrect hostnames and potentially redirecting users to malicious servers.
Mitigation and Prevention
This section outlines the measures to mitigate and prevent CVE-2021-3672.
Immediate Steps to Take
Organizations should update the c-ares library to a patched version, implement DNS security mechanisms, and monitor DNS responses for anomalies to prevent potential Domain Hijacking.
Long-Term Security Practices
Regularly updating software components, conducting security assessments, and educating personnel on DNS security best practices can enhance the organization's overall security posture.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by the software vendor to address known vulnerabilities like CVE-2021-3672.