CVE-2023-39354 : Exploit Details and Defense Strategies

In August 2023, GitHub_M published CVE-2023-39354 related to FreeRDP, an implementation of the Remote Desktop Protocol. The vulnerability involves an Out-Of-Bounds Read in the

nsc_rle_decompress_data

function.

Understanding CVE-2023-39354

This CVE involves a specific vulnerability in the FreeRDP software that could be exploited by attackers to trigger a crash.

What is CVE-2023-39354?

The vulnerability in question is an Out-Of-Bounds Read issue in the

nsc_rle_decompress_data

function of FreeRDP. It arises due to processing

context->Planes

without adequate length verification.

The Impact of CVE-2023-39354

If successfully exploited, attackers could leverage this vulnerability to cause a crash in affected systems. It is crucial to address this issue promptly to prevent potential exploitation.

Technical Details of CVE-2023-39354

This section covers specific technical details of the vulnerability.

Vulnerability Description

The Out-Of-Bounds Read vulnerability within FreeRDP allows attackers to crash systems by manipulating the

context->Planes

data without proper length validation.

Affected Systems and Versions

Vendor: FreeRDP
Product: FreeRDP
Versions Affected:
< 2.11.0

= 3.0.0-beta1, < 3.0.0-beta3

Exploitation Mechanism

By exploiting this vulnerability, attackers can potentially disrupt systems by inducing a crash through unauthorized access to

context->Planes

data.

Mitigation and Prevention

Efficient mitigation strategies and proactive security measures are essential to address this vulnerability.

Immediate Steps to Take

Users are strongly advised to update their FreeRDP installations to the patched versions, specifically 2.11.0 and 3.0.0-beta3, to safeguard against potential exploitation.

Long-Term Security Practices

Implementing robust security protocols, monitoring for unusual activities, and maintaining up-to-date software versions are crucial for enhancing overall system security.

Patching and Updates

Regularly check for security updates and patches released by FreeRDP to address known vulnerabilities and ensure system integrity is maintained.