CVE-2022-39347 : Vulnerability Insights and Analysis

FreeRDP is a free remote desktop protocol library and clients. Affected versions of FreeRDP are missing path canonicalization and base path check for the

drive

channel, allowing a malicious server to trick a FreeRDP based client into reading files outside the shared directory. This issue has been addressed in version 2.9.0, and users are advised to upgrade. Users unable to upgrade should avoid certain redirection switches.

Understanding CVE-2022-39347

FreeRDP's missing path sanitation with the

drive

channel vulnerability allows for potential file read access outside the intended directory.

What is CVE-2022-39347?

CVE-2022-39347 relates to a vulnerability in FreeRDP that enables a malicious server to manipulate a FreeRDP client into accessing files beyond the shared directory.

The Impact of CVE-2022-39347

The impact of this vulnerability includes unauthorized access to sensitive files residing outside the intended directory, potentially leading to data leaks or unauthorized information disclosure.

Technical Details of CVE-2022-39347

The technical details of CVE-2022-39347 include the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The missing path canonicalization and base path check for the

drive

channel in affected versions of FreeRDP allow for file read access outside the intended directory, posing a security risk to users.

Affected Systems and Versions

The vulnerability impacts FreeRDP versions prior to 2.9.0, leaving users of these versions susceptible to the exploitation of this security flaw.

Exploitation Mechanism

A malicious server can exploit this vulnerability by tricking a FreeRDP based client into accessing files outside the shared directory through the

drive

channel.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-39347, users are advised to take immediate steps, implement long-term security practices, and apply relevant patches and updates.

Immediate Steps to Take

Users are urged to upgrade to FreeRDP version 2.9.0 to address the vulnerability and prevent unauthorized file access. For those unable to upgrade, avoiding specific redirection switches is recommended.

Long-Term Security Practices

Implementing secure coding practices, regular security assessments, and maintaining up-to-date software versions can enhance overall cybersecurity posture and mitigate potential threats.

Patching and Updates

Regularly monitoring for security advisories, applying patches promptly, and staying informed about software updates are key practices to protect systems against known vulnerabilities.