CVE-2023-39355 : What You Need to Know

An informative article about the CVE-2023-39355 highlighting the vulnerability, impact, technical details, and mitigation steps.

Understanding CVE-2023-39355

This section provides an in-depth analysis of the CVE-2023-39355 vulnerability affecting FreeRDP.

What is CVE-2023-39355?

CVE-2023-39355 targets FreeRDP, an open-source implementation of the Remote Desktop Protocol, with a potential Use-After-Free security flaw in processing

RDPGFX_CMDID_RESETGRAPHICS

packets.

The Impact of CVE-2023-39355

Exploitation of this vulnerability could lead to a Use-After-Free exploit vector, potentially causing a crash in affected systems. Users are strongly advised to upgrade to version 3.0.0-beta3 to mitigate this risk.

Technical Details of CVE-2023-39355

This section delves into the specifics of the CVE-2023-39355 vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability in FreeRDP versions before 3.0.0-beta3 arises from an improper handling of

RDPGFX_CMDID_RESETGRAPHICS

packets, resulting in a Use-After-Free scenario.

Affected Systems and Versions

FreeRDP versions >= 3.0.0-beta1 and < 3.0.0-beta3 are impacted by CVE-2023-39355, with systems failing to update

context->planesBuffer

susceptible to exploitation.

Exploitation Mechanism

In scenarios where

context->maxPlaneSize

is 0, the exploitation of the Use-After-Free vulnerability occurs due to the inadequate update of

context->planesBuffer

, potentially leading to a crash.

Mitigation and Prevention

This section outlines essential steps to address and prevent the CVE-2023-39355 vulnerability, ensuring the security of systems and data.

Immediate Steps to Take

Users of FreeRDP beta versions 3.x are strongly encouraged to upgrade to version 3.0.0-beta3 to patch the vulnerability and mitigate any potential risks.

Long-Term Security Practices

Implementing robust code review processes, ongoing security assessments, and timely software updates are crucial for maintaining system security and resilience.

Patching and Updates

Regularly monitoring for security advisories, staying informed about software patches, and promptly applying updates are vital for safeguarding systems against emerging threats.