CVE-2021-27220 : What You Need to Know

An issue was discovered in PRTG Network Monitor before version 21.1.66.1623 that allows an attacker to confirm the existence of certain files on the server's filesystem by manipulating the screenshot functionality with specific context paths.

Understanding CVE-2021-27220

This CVE identifies a vulnerability in PRTG Network Monitor that exposes sensitive information on the server.

What is CVE-2021-27220?

CVE-2021-27220 is a security flaw in PRTG Network Monitor prior to version 21.1.66.1623 that enables an unauthorized user to verify the presence of specific files on the system.

The Impact of CVE-2021-27220

Exploitation of this vulnerability can lead to unauthorized access to sensitive files and information stored on the PRTG server, compromising the confidentiality and integrity of data.

Technical Details of CVE-2021-27220

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The issue occurs when an attacker manipulates the screenshot feature of PRTG Network Monitor with crafted context paths, allowing them to confirm file existence on the server's filesystem.

Affected Systems and Versions

PRTG Network Monitor versions before 21.1.66.1623 are impacted by this vulnerability, exposing them to exploitation.

Exploitation Mechanism

By invoking the screenshot functionality with prepared context paths, threat actors can determine the presence of specific files on the server, aiding them in further attacks.

Mitigation and Prevention

Protecting systems from CVE-2021-27220 requires immediate action and long-term security measures.

Immediate Steps to Take

Update PRTG Network Monitor to the latest version (21.1.66.1623) to mitigate the vulnerability.
Monitor server logs for any suspicious activities indicating exploitation.

Long-Term Security Practices

Regularly review and update server configurations to enforce security best practices.

Patching and Updates

Stay informed about security patches and updates released by the software vendor to address known vulnerabilities in PRTG Network Monitor.