CVE-2004-0181 in Linux
Summary
by MITRE
The JFS file system code in Linux 2.4.x has an information leak in which in-memory data is written to the device for the JFS file system, which allows local users to obtain sensitive information by reading the raw device.
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Analysis
by VulDB Data Team • 06/11/2019
The vulnerability described in CVE-2004-0181 represents a critical information disclosure flaw within the JFS (Journaled File System) implementation in Linux kernel versions 2.4.x. This issue arises from improper handling of memory management during file system operations, specifically when the system writes data to storage devices. The vulnerability manifests as an information leak that exposes sensitive data previously stored in memory locations to unauthorized local users who can access the raw device files directly. The JFS file system, designed for high performance and reliability in enterprise environments, contains a flaw in its data handling mechanisms that compromises system security through the exposure of confidential information.
The technical root cause of this vulnerability stems from inadequate memory sanitization practices within the JFS subsystem. When the file system processes certain operations, it fails to properly clear or zero out memory buffers before writing data to the underlying storage device. This memory leakage occurs during normal file system operations where in-memory buffers containing sensitive data such as passwords, cryptographic keys, or system credentials may be inadvertently written to disk sectors that are subsequently accessible through raw device access. The flaw operates at the kernel level and affects the interaction between the JFS file system driver and the underlying block device layer, creating an attack surface that allows local privilege escalation through information gathering.
From an operational perspective, this vulnerability presents significant security implications for systems running affected Linux versions. Local users with access to the system can exploit this weakness by directly reading the raw device files, potentially recovering sensitive information that was previously stored in memory. The impact extends beyond simple data exposure as attackers could leverage this information to perform further attacks, including credential reuse, privilege escalation, or system compromise. The vulnerability is particularly concerning in enterprise environments where JFS is commonly deployed for high-performance storage solutions, as it could lead to unauthorized access to critical system information and potentially facilitate broader security breaches.
The mitigation strategies for this vulnerability involve multiple approaches that address both immediate remediation and long-term security improvements. System administrators should immediately upgrade to Linux kernel versions that contain the appropriate patches for this vulnerability, as the fix typically involves implementing proper memory sanitization routines within the JFS file system code. Additionally, implementing proper access controls and monitoring for raw device access can help detect potential exploitation attempts. Organizations should also consider conducting thorough security assessments of their systems to identify any potential data exposure that may have occurred due to this vulnerability. This issue aligns with CWE-200 (Information Exposure) and can be mapped to ATT&CK technique T1005 (Data from Local System) as it enables unauthorized access to sensitive system information through local means. The vulnerability demonstrates the importance of proper memory management practices in kernel code and highlights the critical need for security testing of file system implementations to prevent information leakage scenarios.