CVE-2024-5148 in gnome-remote-desktop
Summary
by MITRE • 09/02/2024
A flaw was found in the gnome-remote-desktop package. The gnome-remote-desktop system daemon performs inadequate validation of session agents using D-Bus methods related to transitioning a client connection from the login screen to the user session. As a result, the system RDP TLS certificate and key can be exposed to unauthorized users. This flaw allows a malicious user on the system to take control of the RDP client connection during the login screen-to-user session transition.
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Analysis
by VulDB Data Team • 07/05/2025
The vulnerability identified as CVE-2024-5148 resides within the gnome-remote-desktop package, a critical component that facilitates remote desktop connections through the GNOME desktop environment. This flaw represents a significant security weakness in the session management architecture of the system daemon responsible for handling remote desktop protocols. The vulnerability specifically targets the D-Bus method validation mechanisms that govern the transition between the login screen and user session states, creating an exploitable gap in the authentication and authorization processes that should normally protect sensitive cryptographic materials.
The technical implementation of this vulnerability stems from insufficient input validation within the D-Bus communication channels that manage session transitions. When a client attempts to connect through the remote desktop interface, the system daemon should enforce strict validation of session agents before allowing the transition from authentication state to active user session. However, the current implementation fails to properly authenticate or authorize these session agents, allowing unauthorized processes to intercept and manipulate the connection state during the critical login-to-session transition phase. This inadequate validation creates a pathway for malicious actors to exploit the system's trust model and gain unauthorized access to the RDP TLS certificate and private key material.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the integrity of the remote desktop security framework. An attacker who successfully exploits this flaw can not only observe and manipulate RDP connections but can also potentially impersonate legitimate users and gain full access to the system's graphical interface. This represents a critical weakness in the defense-in-depth strategy of the GNOME remote desktop implementation, as it allows unauthorized access to cryptographic materials that should remain protected during the authentication process. The vulnerability particularly affects systems where remote desktop functionality is enabled and where users may be logging in through the graphical login screen.
The security implications of this vulnerability align with CWE-284, which addresses inadequate access control mechanisms, and can be mapped to ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting. Organizations using GNOME remote desktop services face significant risk of unauthorized access to their systems, potentially leading to complete system compromise. The flaw essentially creates a backdoor in the authentication process, allowing attackers to bypass normal security controls and gain access to sensitive cryptographic assets. This vulnerability is particularly concerning in enterprise environments where remote desktop services are commonly deployed and where the exposure of TLS certificates could enable man-in-the-middle attacks against other network services.
Mitigation strategies should focus on immediate patching of the gnome-remote-desktop package to address the D-Bus validation flaw. System administrators should also implement additional monitoring of D-Bus communication patterns during session transitions and consider disabling remote desktop functionality when not actively required. Network segmentation and firewall rules should be implemented to restrict access to RDP ports, while regular audits of session management processes should be conducted to detect any unauthorized access attempts. The vulnerability demonstrates the critical importance of proper input validation and authentication mechanisms in security-critical system components, particularly those handling cryptographic materials and user session transitions.