CVE-2021-44159 : Exploit Details and Defense Strategies

4MOSAn GCB Doctor's file upload function has a critical vulnerability that allows remote attackers to upload arbitrary files without authentication, leading to arbitrary code execution and unauthorized system operations.

Understanding CVE-2021-44159

4MOSAn GCB Doctor is prone to an unrestricted upload of files vulnerability, posing a severe risk to system integrity and confidentiality.

What is CVE-2021-44159?

The vulnerability in 4MOSAn GCB Doctor allows malicious actors to upload various files, including webshells, without proper user privilege control. This can result in unauthorized code execution and potential denial of service attacks.

The Impact of CVE-2021-44159

The vulnerability has a base score of 9.8, indicating a critical severity level. The attacker can compromise system confidentiality, integrity, and availability without requiring user interaction or privileges.

Technical Details of CVE-2021-44159

4MOSAn GCB Doctor's vulnerability can have severe implications for affected systems.

Vulnerability Description

Improper user privilege control in the file upload function
Enables remote attackers to upload arbitrary files, including webshells
Allows execution of arbitrary code leading to unauthorized system operations or denial of service attacks

Affected Systems and Versions

Product: GCB Doctor
Vendor: 4MOSAn
Versions Affected: <= 20210811(2.0)
Version Type: Custom

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Privileges Required: None
User Interaction: None
Scope: Unchanged

Mitigation and Prevention

It is crucial to take immediate action to address the vulnerability in 4MOSAn GCB Doctor.

Immediate Steps to Take

Update 4MOSAn GCB Doctor to version 20210916(v2.0)
Monitor for any unauthorized file uploads or code execution
Implement strict file upload controls and authentication mechanisms

Long-Term Security Practices

Regularly conduct security assessments and audits
Educate users on secure file upload practices
Stay informed about security best practices and updates

Patching and Updates

Apply vendor-released patches promptly
Keep software and systems up to date to address known vulnerabilities