CVE-2022-39316 FreeRDP is a remote desktop protocol library and clients affected in versions out of bound read in ZGFX decoder component.

CVE-2022-39316 FreeRDP is a remote desktop protocol library and clients affected in versions out of bound read in ZGFX decoder component.

As per the FreeRDP team this issue in the server resulted in a fix in the client. Now all you need to do is upgrade your server and you are good to go. VMs running Windows Server 2016 and Windows 10 Anniversary Update are vulnerable. VMs on older versions of Windows are not at risk. As per the FreeRDP team this issue in the server resulted in a fix in the client. Now all you need to do is upgrade your server and you are good to go. VMs running Windows Server 2016 and Windows 10 Anniversary Update are vulnerable. VMs on older versions of Windows are not at risk.

How to check if my Windows VM is vulnerable?

To check if your VM is vulnerable, you need to open a command prompt and enter rdpcontrol getversion. The version number will be 2016 or 10. The following diagram illustrates the vulnerability:

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CVE-2022-39315

This was a vulnerability in the FreeRDP client that was fixed in the server. Now all you need to do is upgrade your server and you are good to go. VMs running Windows Server 2016 and Windows 10 Anniversary Update are vulnerable. VMs on older versions of Windows are not at risk.

FreeRDP Vulnerability

FreeRDP is an open-source implementation of the RDP protocol, which is the standard for remote desktop protocol. It supports a wide variety of platforms and operating systems, including Windows, Linux, macOS, Android, and ChromeOS. FreeRDP has multiple vulnerabilities that can be exploited by attackers to gain control over systems running the software.

1) One of these vulnerabilities allows an attacker to bypass authentication mechanisms on systems running the software.
2) Another vulnerability in the software could allow an attacker to escalate their privileges on vulnerable systems or cause a denial-of-service (DoS) attack via a specially crafted RDP packet.

What is FreeRDP?

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP) that can be used on any operating system. It offers the complete RDP experience, including all graphical sessions, audio and video call support, clipboard integration and text support. FreeRDP also includes an updated RDP client for Windows 10 PCs that is compatible with RemoteFX 4.0 graphics acceleration technology.
FreeRDP provides a solution to users who need to access remote files or printers from their desktop with no add-ons or extra software required. It also allows users to connect multiple computers to one monitor in order to further optimize productivity and make multi-monitor setups more efficient. Additionally, FreeRDP is designed for server installations where it can work as a replacement for the Microsoft Remote Desktop Connection service on Windows Server 2008 SP2 R2 and higher.

Windows Server 2016 and Windows 10 Anniversary Update are vulnerable

The vulnerabilities fixed in the server are CVE-2022-39316 and CVE-2017-11826. The patches released by Microsoft for these vulnerabilities were released in July and August of this year, respectively.

References

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