CVE-2021-37595 : What You Need to Know

FreeRDP before version 2.4.0 on Windows is vulnerable to a flaw in the wf_cliprdr_server_file_contents_request function in client/Windows/wf_cliprdr.c. This vulnerability allows for a FILECONTENTS_RANGE File Contents Request PDU without proper input checks.

Understanding CVE-2021-37595

This section will cover what CVE-2021-37595 entails, its impact, technical details, and mitigation strategies.

What is CVE-2021-37595?

The vulnerability in FreeRDP before 2.4.0 on Windows arises from missing input validation in a specific File Contents Request PDU, potentially leading to security risks.

The Impact of CVE-2021-37595

Exploitation of this vulnerability could allow threat actors to execute arbitrary code or perform other malicious activities on affected systems, compromising confidentiality and integrity.

Technical Details of CVE-2021-37595

Below are the technical aspects related to CVE-2021-37595.

Vulnerability Description

The flaw in wf_cliprdr_server_file_contents_request in FreeRDP client for Windows exists due to insufficient input validation for a FILECONTENTS_RANGE File Contents Request PDU, posing a security threat.

Affected Systems and Versions

All versions of FreeRDP prior to 2.4.0 running on Windows platforms are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted requests to the vulnerable function, possibly leading to unauthorized access or code execution.

Mitigation and Prevention

Protect your systems against CVE-2021-37595 with the following measures.

Immediate Steps to Take

Update FreeRDP to version 2.4.0 or later to patch the vulnerability.
Monitor network traffic for any suspicious activity related to this exploit.

Long-Term Security Practices

Regularly update software and systems to fix known vulnerabilities and enhance security.
Implement network segmentation and access controls to limit the impact of potential cyber threats.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by FreeRDP to address security vulnerabilities.