CVE-2023-39350 : What You Need to Know

This CVE-2023-39350 article provides insights into an Incorrect offset calculation vulnerability in FreeRDP that leads to a denial of service. Learn about the impact, technical details, and mitigation strategies.

Understanding CVE-2023-39350

This section delves into the specifics of CVE-2023-39350, shedding light on the vulnerability's nature and implications.

What is CVE-2023-39350?

CVE-2023-39350 is linked to an incorrect offset calculation in FreeRDP, resulting in a denial of service. FreeRDP, an open-source implementation of the Remote Desktop Protocol (RDP), is impacted by this vulnerability.

The Impact of CVE-2023-39350

The vulnerability's high attack complexity and impact on network availability highlight the severity of CVE-2023-39350. It pertains exclusively to FreeRDP clients and can lead to a Denial of Service (DOS) condition due to Integer Underflow.

Technical Details of CVE-2023-39350

This section explores the technical aspects of CVE-2023-39350, including how the vulnerability manifests and its potential exploitation.

Vulnerability Description

CVE-2023-39350 arises from an Integer Underflow scenario caused by inadequate blockLen input validation in FreeRDP. This flaw can trigger a DOS situation, such as an abort due to

WINPR_ASSERT

with default compilation flags.

Affected Systems and Versions

Versions prior to 2.11.0 and those between 3.0.0-beta1 and 3.0.0-beta3 of FreeRDP are susceptible to CVE-2023-39350. Users operating FreeRDP clients falling within these version ranges are urged to update to eliminate the vulnerability.

Exploitation Mechanism

The exploitation of CVE-2023-39350 involves providing an insufficient blockLen without proper length validation. This triggers an Integer Underflow, ultimately resulting in a Denial of Service scenario.

Mitigation and Prevention

This section outlines the steps that individuals or organizations can take to mitigate the risks associated with CVE-2023-39350 and prevent potential exploitation.

Immediate Steps to Take

Immediate action involves updating FreeRDP to versions 2.11.0 or 3.0.0-beta3, the releases that address the vulnerability. Users are advised to prioritize this update to safeguard against possible DOS incidents.

Long-Term Security Practices

In the long term, fostering strict validation practices and ensuring timely software updates can enhance cybersecurity resilience, reducing the likelihood of similar vulnerabilities.

Patching and Updates

Regularly monitoring for security advisories and promptly applying patches or updates is crucial to maintaining a secure software environment and mitigating emerging threats.