CVE-2004-0997 in Linux
Summary
by MITRE
Unspecified vulnerability in the ptrace MIPS assembly code in Linux kernel 2.4 before 2.4.17 allows local users to gain privileges via unknown vectors.
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Analysis
by VulDB Data Team • 06/30/2021
The vulnerability identified as CVE-2004-0997 represents a critical privilege escalation flaw within the Linux kernel version 2.4.x series, specifically affecting systems running kernel versions prior to 2.4.17. This issue resides within the ptrace implementation for MIPS architecture, a system call mechanism that enables one process to observe and control the execution of another process. The vulnerability's unspecified nature indicates that the exact technical vector remains undocumented in the public domain, though it clearly involves manipulation of the ptrace functionality that traditionally serves debugging and system monitoring purposes. The ptrace system call is fundamental to process tracing and debugging operations across Unix-like systems, making this particular flaw particularly concerning for system security.
The technical flaw manifests in the MIPS-specific assembly code implementation of ptrace within the Linux kernel, where local users can exploit unspecified vectors to elevate their privileges from standard user level to root or administrative privileges. This privilege escalation occurs through manipulation of the kernel's process tracing mechanisms, which are designed to provide controlled access to process memory and execution states. The vulnerability's presence in the kernel's MIPS architecture implementation suggests that it specifically targets the low-level assembly code handling process tracing operations on MIPS-based systems, potentially involving improper validation of process control operations or flawed privilege checking mechanisms during ptrace system calls. Such vulnerabilities fall under the CWE-264 category of "Permissions, Privileges, and Access Controls" and may align with ATT&CK techniques involving privilege escalation through kernel exploits.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it enables attackers with basic user access to gain complete system control without requiring physical access or specialized tools. Local users who can execute processes on affected systems can leverage this vulnerability to bypass security controls, potentially accessing sensitive data, modifying system configurations, or establishing persistent access through privilege escalation. The exploitation of such vulnerabilities can lead to complete system compromise, as the attacker gains root privileges and can then manipulate the entire system. Systems running kernel versions 2.4.16 or earlier are particularly vulnerable, making this a critical issue for organizations maintaining legacy systems or those that have not updated their kernel versions. This vulnerability demonstrates the importance of kernel security updates and the potential consequences of delayed patching in enterprise environments where older kernel versions may be maintained for compatibility reasons.
The mitigation strategy for CVE-2004-0997 requires immediate kernel version updates to 2.4.17 or later, which contain the necessary fixes for the ptrace implementation on MIPS architecture. System administrators should prioritize patching affected systems and verify that kernel updates have been properly applied, particularly on MIPS-based systems where this vulnerability was specifically documented. Additional mitigations include implementing proper system monitoring to detect unauthorized privilege escalation attempts and reviewing system access controls to minimize the impact of potential exploitation. Organizations should also consider implementing network segmentation and access controls to limit local user access to critical systems where kernel-level vulnerabilities may exist. The vulnerability highlights the importance of maintaining current kernel versions and the potential risks associated with running outdated operating system components in enterprise environments.