CVE-2021-37594 : Exploit Details and Defense Strategies

FreeRDP before version 2.4.0 on Windows is impacted by CVE-2021-37594 due to missing input checks in the wf_cliprdr_server_file_contents_request function. This vulnerability allows an attacker to exploit a FILECONTENTS_SIZE File Contents Request PDU.

Understanding CVE-2021-37594

This section will delve into the details of the CVE-2021-37594 vulnerability.

What is CVE-2021-37594?

The CVE-2021-37594 vulnerability in FreeRDP on Windows arises from inadequate input validation in the wf_cliprdr_server_file_contents_request function, potentially exposing systems to malicious FILECONTENTS_SIZE File Contents Request PDU.

The Impact of CVE-2021-37594

The impact of this vulnerability includes the risk of attackers exploiting the lack of input checks to carry out remote code execution or other malicious activities on affected Windows systems.

Technical Details of CVE-2021-37594

This section will provide technical insights into the CVE-2021-37594 vulnerability.

Vulnerability Description

The vulnerability in FreeRDP before 2.4.0 enables threat actors to send malicious FILECONTENTS_SIZE File Contents Request PDUs due to missing input validations in wf_cliprdr_server_file_contents_request on Windows.

Affected Systems and Versions

All versions of FreeRDP before 2.4.0 running on Windows are vulnerable to CVE-2021-37594 due to the identified security flaw in the wf_cliprdr_server_file_contents_request function.

Exploitation Mechanism

Exploiting CVE-2021-37594 involves sending crafted requests utilizing FILECONTENTS_SIZE File Contents Request PDU to potentially trigger malicious activities on the target system.

Mitigation and Prevention

This section will guide users on how to mitigate and prevent exploitation of the CVE-2021-37594 vulnerability.

Immediate Steps to Take

It is recommended to update FreeRDP to version 2.4.0 or newer, which includes patches to address the vulnerability and enhance security.

Long-Term Security Practices

Employing secure coding practices, regular software updates, and monitoring for suspicious activities can help in preventing similar vulnerabilities in the future.

Patching and Updates

Regularly monitoring for security updates from FreeRDP and promptly applying patches can ensure that systems are protected from known vulnerabilities like CVE-2021-37594.