CVE-2004-2050 in Thintune Extreme
Summary
by MITRE
eSeSIX Thintune thin clients running firmware 2.4.38 and earlier allow local users to gain privileges by pressing CTRL-SHIFT-ALT-DEL and entering the "maertsJ" password, which is hard-coded into lshell.
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Analysis
by VulDB Data Team • 07/17/2017
The vulnerability described in CVE-2004-2050 affects eSeSIX Thintune thin clients operating with firmware versions 2.4.38 and earlier. This represents a critical security flaw that undermines the fundamental security model of these thin client devices. Thin clients are designed to provide secure, centralized computing environments by limiting local system access and maintaining strict control over user interactions. The presence of a hard-coded password within the lshell component of the firmware creates an inherent backdoor that bypasses normal authentication mechanisms and undermines the security architecture of these devices.
The technical implementation of this vulnerability involves a specific keyboard sequence that triggers privileged access within the thin client environment. When local users press CTRL-SHIFT-ALT-DEL and subsequently enter the password "maertsJ", they gain elevated privileges within the system. This hard-coded password is embedded within the lshell component, which serves as a shell interface for the thin client's operating system. The lshell component is typically responsible for managing user sessions and providing controlled access to system resources, but the inclusion of this hardcoded credential creates an unauthorized access pathway that persists across system reboots and normal operational procedures.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass broader security implications for organizations relying on thin client infrastructure. The presence of a hard-coded password means that any local user with physical access to the device can bypass security controls and potentially access sensitive system resources. This vulnerability directly violates security principles outlined in the Common Weakness Enumeration framework, specifically aligning with CWE-259 which addresses the use of hard-coded passwords or keys. The flaw represents a fundamental failure in secure credential management and demonstrates poor security practices in embedded system development.
Organizations utilizing eSeSIX Thintune thin clients with affected firmware versions face significant risks including unauthorized system access, potential data breaches, and compromise of centralized computing environments. The vulnerability's persistence across system restarts and its accessibility through simple keyboard input makes it particularly dangerous in environments where physical security controls may be inadequate. From an attack surface perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting local system access and credential manipulation. The attack vector is particularly concerning as it requires no specialized tools or network access, relying solely on physical presence and basic keyboard input.
Mitigation strategies for this vulnerability require immediate firmware updates from the vendor to address the hardcoded password issue. Organizations should implement comprehensive inventory management to identify all affected devices and prioritize remediation efforts. Additional protective measures include physical security controls to prevent unauthorized access to thin client devices, network segmentation to limit potential lateral movement, and monitoring for unusual system access patterns. The vulnerability highlights the importance of secure development practices and regular security assessments of embedded systems, particularly those deployed in critical infrastructure environments where unauthorized access could have significant operational and security implications.