CVE-2023-42799 : Exploit Details and Defense Strategies

A buffer overflow vulnerability was identified in the moonlight-common-c software due to the unmitigated usage of unsafe C functions and improper bounds checking. This CVE allows attackers to crash the moonlight client or potentially execute remote code on the client.

Understanding CVE-2023-42799

Moonlight-common-c contains the core GameStream client code shared between Moonlight clients. The vulnerability arises from buffer overflow starting in a specific commit due to unsafe C functions.

What is CVE-2023-42799?

The CVE-2023-42799 relates to a buffer overflow vulnerability in the moonlight-common-c software, allowing malicious actors to potentially crash clients or execute remote code.

The Impact of CVE-2023-42799

The vulnerability poses a high risk with a CVSS v3.1 base score of 8.8. It could lead to unauthorized access, data tampering, or denial of service attacks on affected systems.

Technical Details of CVE-2023-42799

The vulnerability in moonlight-common-c is due to the unmitigated use of

strcpy

in

parseUrlAddrFromRtspUrlString

function, resulting in a classic buffer overflow vulnerability.

Vulnerability Description

The vulnerability allows a malicious game streaming server to exploit a buffer overflow, potentially crashing a moonlight client or executing remote code on the client.

Affected Systems and Versions

Vendor: moonlight-stream Product: moonlight-common-c Affected Versions: >= 50c0a51b10ecc5b3415ea78c21d96d679e2288f9, < 02b7742f4d19631024bd766bd2bb76715780004e

Exploitation Mechanism

Attack Complexity: Low Attack Vector: Network Impact: High Confidentiaility, Integrity, and Availability impact User Interaction: Required

Mitigation and Prevention

It is crucial to take immediate steps to secure systems and prevent exploitation of this vulnerability.

Immediate Steps to Take

Apply the latest security updates and patches provided by moonlight-stream.
Implement network segmentation and access controls to limit exposure.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Moonlight.
Conduct security training to educate users on safe practices and threat awareness.

Patching and Updates

Refer to the GitHub links below for the commit addressing the vulnerability:

Commit 02b7742f4d19631024bd766bd2bb76715780004e
Commit 50c0a51b10ecc5b3415ea78c21d96d679e2288f9