CVE-2002-2036 in Ray Server Software
Summary
by MITRE
Sun Ray Server Software (SRSS) 1.3, when Non-Smartcard Mobility (NSCM) is enabled, allows remote attackers to login as another user by running dtlogin from a system that supports the XDMCP client.
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Analysis
by VulDB Data Team • 07/08/2024
The vulnerability described in CVE-2002-2036 represents a critical authentication bypass flaw within Sun Ray Server Software version 1.3 that specifically affects systems configured with Non-Smartcard Mobility enabled. This issue stems from a fundamental weakness in the software's session management and authentication mechanisms, creating an exploitable pathway that allows remote attackers to impersonate legitimate users within the system. The vulnerability is particularly concerning because it leverages the XDMCP protocol, which is designed for remote desktop access and session management, to facilitate unauthorized access to user sessions.
The technical flaw manifests when the Non-Smartcard Mobility feature is activated, which is intended to allow users to access their sessions from different terminals without requiring physical smartcards. However, this functionality introduces a security gap where the system fails to properly validate authentication credentials when XDMCP client connections are established. Attackers can exploit this by running the dtlogin program from a remote system that supports XDMCP client functionality, effectively bypassing the normal authentication process. This allows them to establish a session as any valid user within the system, potentially gaining access to sensitive data, applications, and system resources that belong to other users.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to potentially escalate their privileges and move laterally within the network infrastructure. When combined with the XDMCP protocol's inherent capabilities for remote desktop connections, this vulnerability creates a pathway for attackers to assume the identity of legitimate users, potentially accessing confidential information, modifying system configurations, or executing malicious code with the privileges of the compromised user. The attack vector is particularly dangerous because it can be executed remotely without requiring physical access to the target system, making it an attractive target for cybercriminals seeking to gain unauthorized access to enterprise environments.
This vulnerability aligns with CWE-287, which addresses improper authentication issues in software systems, and represents a classic example of how feature implementations can introduce security weaknesses when proper authentication controls are not adequately enforced. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under the T1078 credential access category, where adversaries leverage legitimate credentials and access methods to gain unauthorized access to systems and resources. Organizations using Sun Ray Server Software with Non-Smartcard Mobility enabled should immediately implement mitigations including disabling the vulnerable feature, restricting XDMCP access through network segmentation, and implementing additional authentication controls to prevent unauthorized remote access to user sessions.
The recommended mitigations for this vulnerability include disabling the Non-Smartcard Mobility feature when it is not strictly required for business operations, implementing strict firewall rules to restrict XDMCP traffic to trusted networks only, and ensuring that all systems supporting XDMCP client functionality are properly secured and monitored. Additionally, organizations should consider implementing multi-factor authentication mechanisms to add additional layers of security beyond simple username and password authentication. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other components of the system. The vulnerability also highlights the importance of secure configuration management and the need for organizations to carefully evaluate the security implications of enabling features that provide convenience at the expense of system security.