CVE-2021-20104 : Exploit Details and Defense Strategies

A critical vulnerability has been identified in AppNitro Machform versions prior to version 16, which could allow unauthenticated remote code execution due to inadequate sanitization of file attachments uploaded through upload.php.

Understanding CVE-2021-20104

This section will provide insights into the nature and impact of the CVE-2021-20104 vulnerability.

What is CVE-2021-20104?

CVE-2021-20104 refers to a security flaw in AppNitro Machform versions before version 16 that permits unauthenticated remote code execution, creating a serious risk of exploitation by threat actors.

The Impact of CVE-2021-20104

The vulnerability in CVE-2021-20104 allows remote attackers to execute arbitrary code on the target system without authentication, potentially leading to unauthorized access, data theft, and further compromise of the affected system.

Technical Details of CVE-2021-20104

In this section, we delve into the specifics of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

Machform versions before 16 lack proper sanitization of file attachments uploaded via upload.php, enabling threat actors to upload malicious files leading to code execution without authentication.

Affected Systems and Versions

All versions of AppNitro Machform before version 16 are impacted by CVE-2021-20104, exposing users who have not updated to the latest version to the risk of remote code execution.

Exploitation Mechanism

The vulnerability is exploited by uploading malicious files through forms using upload.php, bypassing authentication and enabling remote attackers to execute unauthorized commands on the targeted system.

Mitigation and Prevention

This section covers the steps users and administrators can take to mitigate the risks posed by CVE-2021-20104 and prevent potential exploitation.

Immediate Steps to Take

Users are strongly advised to update their AppNitro Machform installations to version 16 or later to eliminate the vulnerability and protect their systems from remote code execution.

Long-Term Security Practices

Regularly updating software and implementing secure coding practices can help prevent similar vulnerabilities in the future, enhancing overall cybersecurity posture.

Patching and Updates

Vendor-released patches addressing the CVE-2021-20104 vulnerability should be promptly applied to ensure system security and prevent unauthorized code execution.