CVE-2017-7281 Explained : Impact and Mitigation

Unitrends Enterprise Backup versions prior to 9.1.2 are vulnerable to Unrestricted File Upload, allowing authenticated users to execute unauthorized remote code.

Understanding CVE-2017-7281

What is CVE-2017-7281?

A vulnerability in Unitrends Enterprise Backup versions before 9.1.2 enables authenticated users to create files on the disk with user-controlled content, potentially leading to remote code execution.

The Impact of CVE-2017-7281

This vulnerability, known as Unrestricted File Upload, poses a significant risk as it allows attackers to execute malicious code on the affected system, compromising its integrity and security.

Technical Details of CVE-2017-7281

Vulnerability Description

The flaw resides in the createReportName and saveReport functions in the recoveryconsole/bpl/reports.php file, where inadequate input sanitization permits users to create files with arbitrary names, extensions, contents, and paths.

Affected Systems and Versions

Product: Unitrends Enterprise Backup
Versions: Prior to 9.1.2

Exploitation Mechanism

Attackers exploit the lack of input validation in the mentioned functions to upload files with malicious content, potentially leading to the execution of unauthorized remote code.

Mitigation and Prevention

Immediate Steps to Take

Upgrade to version 9.1.2 or later to mitigate the vulnerability.
Implement strict input validation and sanitization mechanisms to prevent unauthorized file uploads.

Long-Term Security Practices

Regularly monitor and audit file uploads and user activities to detect any suspicious behavior.
Educate users on safe file handling practices to minimize the risk of unauthorized uploads.

Patching and Updates

Stay informed about security updates and patches released by Unitrends and promptly apply them to ensure the system's security.