CVE-2021-42857 : Vulnerability Insights and Analysis

The SteelCentral AppInternals Dynamic Sampling Agent by Aternity is affected by a directory traversal vulnerability in the AgentDaServlet, allowing malicious payloads to be injected.

Understanding CVE-2021-42857

What is CVE-2021-42857?

CVE-2021-42857 is a directory traversal vulnerability found in the SteelCentral AppInternals Dynamic Sampling Agent's AgentDaServlet.

The Impact of CVE-2021-42857

This vulnerability can be exploited to perform directory traversal attacks, potentially compromising the integrity of the affected system.

Technical Details of CVE-2021-42857

Vulnerability Description

The vulnerability exists in the AgentDaServlet of the SteelCentral AppInternals Dynamic Sampling Agent at the "/api/appInternals/1.0/agent/da/pcf" endpoint due to the lack of input validation.

Affected Systems and Versions

SteelCentral AppInternals Dynamic Sampling Agent version 10.x is affected.
Versions less than 12.13.0 and 11.8.8 are also impacted.

Exploitation Mechanism

The vulnerability allows attackers to inject malicious payloads through the affected API endpoint, enabling directory traversal attacks.

Mitigation and Prevention

Immediate Steps to Take

Patch the affected SteelCentral AppInternals Dynamic Sampling Agent to versions 12.13.0 or higher.
Implement input validation mechanisms to prevent malicious payload injections.

Long-Term Security Practices

Regularly monitor and audit web application security controls.
Conduct security assessments and penetration testing to identify vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by Aternity.