CVE-2021-32642 : Vulnerability Insights and Analysis

This article provides an overview of CVE-2021-32642, detailing the impact of missing input validation in dynamic discovery example scripts of radsecproxy.

Understanding CVE-2021-32642

CVE-2021-32642 highlights a vulnerability in radsecproxy's

naptr-eduroam.sh

and

radsec-dynsrv.sh

scripts, leading to configuration injection via crafted radsec peer discovery DNS records.

What is CVE-2021-32642?

radsecproxy, a RADIUS proxy supporting UDP and TLS transports, is affected by missing input validation in specific scripts, allowing for potential unauthorized access and denial of service attacks.

The Impact of CVE-2021-32642

The vulnerability poses risks of information disclosure, denial of service, and redirection of Radius connections to unauthorized servers, resulting in non-authenticated network access.

Technical Details of CVE-2021-32642

The vulnerability's CVSS v3.1 score is 7, with a high attack complexity and impact on availability. It requires no special privileges and can be exploited over a network.

Vulnerability Description

The flaw in radsecproxy's scripts allows for configuration injection via crafted DNS records, potentially leading to unauthorized network access.

Affected Systems and Versions

Versions of radsecproxy prior to 1.9.0 are affected by this vulnerability.

Exploitation Mechanism

By exploiting the missing input validation, attackers can inject malicious configurations, leading to various security risks.

Mitigation and Prevention

To mitigate CVE-2021-32642, users should take immediate steps, implement long-term security practices, and ensure timely patching and updates.

Immediate Steps to Take

Users are advised to update the example scripts 'naptr-eduroam.sh' and 'radsec-dynsrv.sh' manually to address the vulnerability.

Long-Term Security Practices

Adopt security measures such as regular security audits, network segmentation, and access controls to enhance overall system security.

Patching and Updates

Ensure that radsecproxy's scripts are regularly updated to stay protected from potential security threats.