CVE-2002-1974 in Zaurus
Summary
by MITRE
The FTP service in Zaurus PDAs SL-5000D and SL-5500 does not require authentication, which allows remote attackers to access the file system as root.
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Analysis
by VulDB Data Team • 05/11/2019
The vulnerability described in CVE-2002-1974 represents a critical security flaw in the File Transfer Protocol implementation of specific Sharp Zaurus Personal Digital Assistants. These devices, namely the SL-5000D and SL-5500 models, shipped with an FTP service that failed to enforce proper authentication mechanisms, creating an exploitable condition that allowed unauthorized remote access to the underlying file system with root privileges. This fundamental design flaw in the device's network services architecture created a severe security risk that could be exploited by remote attackers without any credentials or authorization.
The technical nature of this vulnerability stems from the absence of authentication requirements within the FTP service implementation, which is categorized under CWE-287 - Improper Authentication. The flaw exists at the protocol level where the FTP daemon accepts connections and immediately grants full system access without requiring any user credentials, username, or password validation. This represents a classic case of weak session management and authentication bypass, where the service operates in a mode that assumes all connections are legitimate and authorized, effectively eliminating any form of access control or privilege separation. The vulnerability specifically affects the embedded operating system of these devices, which likely ran a variant of Linux with an FTP server implementation that lacked proper security hardening.
The operational impact of this vulnerability is severe and far-reaching for users of these devices, as it provides attackers with complete administrative control over the device's file system. Remote attackers can access, modify, delete, or exfiltrate any files stored on the device, including sensitive user data, configuration files, and potentially system-critical components. The fact that access is granted with root privileges means that attackers can bypass all normal security restrictions, install malicious software, modify system configurations, and essentially take full control of the device. This vulnerability transforms what should be a secure mobile computing platform into an open target for remote exploitation, particularly concerning the sensitive nature of personal data typically stored on PDAs. The impact extends beyond individual device compromise to potential data breaches, privacy violations, and the possibility of these compromised devices being used as launching points for attacks on other systems within the same network.
Mitigation strategies for this vulnerability should focus on immediate access control measures and network segmentation approaches. Organizations and individuals should disable the FTP service entirely on affected devices unless absolutely necessary for specific operational requirements, as the service should not be running in a production environment without proper authentication. Network-level protections such as firewall rules that block FTP traffic to these devices can provide additional layers of defense, while regular network monitoring should be implemented to detect unauthorized FTP connections. From a security hardening perspective, this vulnerability highlights the importance of proper service configuration and the principle of least privilege, where services should only be enabled when required and should always enforce proper authentication mechanisms. The remediation process should involve either patching the device firmware to implement proper authentication or physically disabling the FTP service, as the vulnerability cannot be effectively addressed through configuration changes alone due to the fundamental flaw in the service implementation. This case demonstrates the critical importance of security by design principles in embedded systems and mobile devices where the attack surface is limited and every service must be carefully evaluated for security implications, aligning with the ATT&CK framework's concept of privilege escalation and remote code execution through unauthenticated access to system services.