CVE-2009-3278 in Ts-239 Pro Turbo Nas
Summary
by MITRE
The QNAP TS-239 Pro and TS-639 Pro with firmware 2.1.7 0613, 3.1.0 0627, and 3.1.1 0815 use the rand library function to generate a certain recovery key, which makes it easier for local users to determine this key via a brute-force attack.
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Analysis
by VulDB Data Team • 06/12/2017
The vulnerability identified as CVE-2009-3278 affects QNAP network-attached storage devices including the TS-239 Pro and TS-639 Pro models running specific firmware versions. This weakness stems from the implementation of cryptographic key generation within the device's recovery mechanism, creating a significant security risk for users who rely on these systems for data protection. The issue specifically impacts the generation of recovery keys used during system recovery operations, which are critical for restoring functionality when the device encounters operational failures or security breaches.
The technical flaw resides in the use of the rand library function for generating recovery keys, which represents a fundamental misunderstanding of cryptographic security requirements. The rand function, while suitable for general programming purposes, lacks the cryptographic strength necessary for generating secure keys. This approach violates established security principles outlined in the Common Weakness Enumeration framework, specifically mapping to CWE-330 Use of Insufficiently Random Values. The predictable nature of the rand function means that the generated recovery keys follow patterns that can be exploited through brute-force attacks, significantly reducing the effective entropy of the key space. This weakness directly contravenes the National Institute of Standards and Technology guidelines for cryptographic key generation, which mandate the use of cryptographically secure random number generators for security-critical applications.
The operational impact of this vulnerability extends beyond simple convenience issues to represent a serious threat to data security and system integrity. Local users who gain access to the system can potentially determine recovery keys through systematic brute-force attempts, undermining the entire recovery mechanism designed to protect against unauthorized access. This vulnerability creates a pathway for attackers to bypass security controls, potentially leading to complete system compromise and unauthorized data access. The attack surface is particularly concerning because it targets the recovery functionality, which is often the last line of defense when systems encounter critical failures or security incidents. The weakness is classified under the MITRE ATT&CK framework as a privilege escalation technique, specifically targeting the recovery and restoration processes that are essential for maintaining system availability and integrity.
Mitigation strategies for this vulnerability require immediate firmware updates from QNAP to address the root cause of the weak random number generation. Organizations should implement comprehensive monitoring of their QNAP devices to detect any unauthorized access attempts or recovery key usage patterns. The remediation process should include immediate replacement of affected firmware versions with secure alternatives that utilize cryptographically secure random number generators. Security administrators must also consider implementing additional access controls and monitoring mechanisms around recovery operations to detect and prevent unauthorized attempts to exploit this weakness. The vulnerability highlights the critical importance of proper cryptographic implementation in embedded systems and underscores the necessity of adhering to established security standards and best practices for all security-relevant functions within networked storage devices.