CVE-2008-5393 in Unbuntu Privacy Remix
Summary
by MITRE
UPR-Kernel in Ubuntu Privacy Remix (UPR) before 8.04_r1 includes kernel support for mounting RAID arrays, which might allow remote attackers to bypass intended isolation mechanisms by (1) reading from or (2) writing to these arrays.
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Analysis
by VulDB Data Team • 11/27/2017
The vulnerability identified as CVE-2008-5393 affects the Ubuntu Privacy Remix (UPR) distribution, specifically its kernel implementation known as UPR-Kernel. This issue resides within the kernel's handling of RAID array mounting capabilities, creating a significant security flaw that undermines the system's intended isolation mechanisms. The vulnerability is particularly concerning because it affects a privacy-focused operating system variant designed to provide enhanced security and data protection. The flaw exists in versions prior to 8.04_r1, indicating that this was a recognized weakness that required specific patching to address the underlying security concerns.
The technical implementation of this vulnerability stems from the kernel's support for mounting RAID arrays, which provides direct access to storage devices that should otherwise be isolated from unauthorized users or processes. When the kernel allows mounting of RAID arrays, it essentially provides a pathway for attackers to access data that should remain protected within separate storage volumes or partitions. The vulnerability manifests in two distinct attack vectors: read access and write access to these mounted arrays. This dual capability means that an attacker could not only extract sensitive information from the RAID arrays but also potentially modify or corrupt data within these storage systems, amplifying the potential impact of the security breach.
The operational impact of this vulnerability extends beyond simple data access, as it fundamentally compromises the isolation properties that privacy-focused systems like UPR are designed to maintain. In a privacy remix environment, users expect that their data remains isolated and protected from unauthorized access, particularly when the system is designed to prevent information leakage between different security domains. The ability to bypass these isolation mechanisms through RAID array mounting creates a backdoor that could allow attackers to access sensitive information stored on these arrays, potentially including personal data, communications, or other confidential materials. This compromise undermines the core security model of the system and could lead to data breaches or unauthorized data manipulation that violates user privacy expectations.
This vulnerability aligns with several cybersecurity frameworks and threat models, particularly those related to privilege escalation and data exposure. From a CWE perspective, this issue relates to weaknesses in the kernel's access control mechanisms and improper handling of storage device access, potentially classified under CWE-284 for improper access control or CWE-362 for concurrent execution using shared data. The attack pattern follows principles outlined in the MITRE ATT&CK framework, specifically related to privilege escalation and persistence techniques where attackers leverage kernel-level capabilities to gain unauthorized access to storage resources. Organizations using UPR or similar privacy-focused systems should implement immediate patching to address this vulnerability, while also reviewing their storage access controls and implementing additional monitoring to detect unauthorized RAID array mounting attempts. The remediation process should include updating to version 8.04_r1 or later, followed by security auditing of storage access patterns and verification of proper isolation mechanisms.