CVE-2023-5766 Overview
A remote code execution vulnerability exists in Devolutions Remote Desktop Manager 2023.2.33 and earlier versions running on Windows. This vulnerability allows an attacker to remotely execute code from another Windows user session on the same host via a specially crafted TCP packet. The network-accessible nature of this vulnerability combined with the ability to execute arbitrary code makes this a critical security concern for organizations using Remote Desktop Manager for credential and connection management.
Critical Impact
Unauthenticated remote attackers can execute arbitrary code on affected systems by sending specially crafted TCP packets, potentially compromising sensitive credentials and connection configurations stored in Remote Desktop Manager.
Affected Products
- Devolutions Remote Desktop Manager versions 2023.2.33 and earlier
- Microsoft Windows (as the underlying operating system platform)
- All Windows environments running vulnerable Remote Desktop Manager installations
Discovery Timeline
- November 1, 2023 - CVE-2023-5766 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2023-5766
Vulnerability Analysis
This vulnerability affects the inter-process communication mechanism within Devolutions Remote Desktop Manager on Windows systems. The flaw enables cross-session code execution, meaning an attacker can execute malicious code within the context of another user's session on the same host. This is particularly dangerous in multi-user environments such as terminal servers, Remote Desktop Services (RDS) hosts, or shared workstations.
The vulnerability requires no authentication and no user interaction to exploit, making it highly exploitable in network-accessible deployments. Successful exploitation could grant attackers access to credentials, connection configurations, and other sensitive data managed by Remote Desktop Manager.
Root Cause
The vulnerability stems from insufficient validation or improper handling of incoming TCP packets within Remote Desktop Manager's network communication components. When the application processes specially crafted TCP packets, it fails to properly validate the packet contents or the origin of the request, allowing an attacker to inject and execute arbitrary code within a different user's session context.
Attack Vector
The attack is conducted over the network by sending specially crafted TCP packets to a vulnerable Remote Desktop Manager instance. The attacker does not need valid credentials or any form of authentication to exploit this vulnerability. The attack can be launched from any network location that can reach the vulnerable host's TCP port used by Remote Desktop Manager.
An attacker would:
- Identify a target system running a vulnerable version of Remote Desktop Manager
- Craft a malicious TCP packet designed to trigger the vulnerability
- Send the packet to the target host
- Achieve code execution within another user's Windows session on the same machine
No verified code examples are available for this vulnerability. For detailed technical information, refer to the Devolutions Security Advisory DEVO-2023-0019.
Detection Methods for CVE-2023-5766
Indicators of Compromise
- Unexpected network connections to Remote Desktop Manager processes from unusual source addresses
- Anomalous TCP traffic patterns targeting ports used by Remote Desktop Manager
- Unusual process spawning or child processes originating from Remote Desktop Manager executables
- Evidence of code execution in user sessions that do not correlate with legitimate user activity
Detection Strategies
- Monitor for unusual TCP connections targeting Remote Desktop Manager service ports
- Implement network intrusion detection rules to identify malformed or suspicious packets directed at Remote Desktop Manager
- Use endpoint detection and response (EDR) solutions to monitor for unexpected process behavior from RemoteDesktopManager.exe
- Audit Windows event logs for cross-session execution attempts or privilege escalation events
Monitoring Recommendations
- Enable detailed network logging for systems running Remote Desktop Manager
- Configure SIEM alerts for anomalous outbound connections from Remote Desktop Manager processes
- Monitor for unauthorized modifications to Remote Desktop Manager configuration files or databases
- Implement behavioral analysis to detect deviations from normal Remote Desktop Manager usage patterns
How to Mitigate CVE-2023-5766
Immediate Actions Required
- Update Devolutions Remote Desktop Manager to a version newer than 2023.2.33 immediately
- Restrict network access to Remote Desktop Manager hosts using firewall rules or network segmentation
- Review system logs for evidence of exploitation attempts
- Implement network monitoring to detect suspicious TCP traffic targeting affected systems
Patch Information
Devolutions has addressed this vulnerability in versions released after 2023.2.33. Organizations should update to the latest available version of Remote Desktop Manager. Detailed patch information and updated versions are available in the Devolutions Security Advisory DEVO-2023-0019.
Workarounds
- Restrict network access to Remote Desktop Manager installations using host-based firewalls or network ACLs
- Isolate systems running Remote Desktop Manager in dedicated network segments with strict ingress filtering
- Limit the number of user sessions on hosts running Remote Desktop Manager to reduce cross-session attack surface
- Consider temporarily disabling Remote Desktop Manager on multi-user systems until patching is completed
# Example: Restrict network access to Remote Desktop Manager using Windows Firewall
# Block inbound TCP connections to Remote Desktop Manager from untrusted networks
netsh advfirewall firewall add rule name="Block RDM External Access" dir=in action=block protocol=tcp remoteip=any localport=<RDM_PORT> profile=any
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
