CVE-2001-0316 in Linux
Summary
by MITRE
Linux kernel 2.4 and 2.2 allows local users to read kernel memory and possibly gain privileges via a negative argument to the sysctl call.
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Analysis
by VulDB Data Team • 10/21/2024
The vulnerability identified as CVE-2001-0316 represents a critical security flaw in the Linux kernel versions 2.2 and 2.4 that exposes sensitive kernel memory to local users through improper validation of sysctl system calls. This issue stems from a fundamental flaw in the kernel's input handling mechanism where negative arguments to the sysctl function are not properly validated, creating a pathway for unauthorized memory access. The vulnerability operates at the kernel level and specifically targets the system control interface that allows users to modify kernel parameters during runtime, making it particularly dangerous as it can be exploited by any local user with access to the system.
The technical implementation of this vulnerability involves the sysctl system call which serves as the primary interface for configuring kernel parameters. When a negative argument is passed to this function, the kernel fails to properly validate the input parameters, leading to improper memory access patterns. This flaw falls under the category of improper input validation and can be categorized as CWE-129, which addresses insufficient validation of length of input buffers. The vulnerability allows attackers to read arbitrary kernel memory locations, potentially exposing sensitive information such as cryptographic keys, passwords, or other confidential data stored in kernel memory spaces. The attack vector is particularly concerning because it requires minimal privileges and can be executed by any local user, making it a significant concern for system administrators managing multi-user environments.
The operational impact of CVE-2001-0316 extends beyond simple information disclosure to potentially enable privilege escalation within the affected systems. While the primary exploitation mechanism allows for kernel memory reading, sophisticated attackers can leverage this capability to discover system vulnerabilities or extract information that could be used to further compromise the system. The vulnerability aligns with ATT&CK technique T1003.002 which focuses on OS credential dumping, as the ability to read kernel memory can expose sensitive authentication data. Additionally, the flaw represents a privilege escalation opportunity that can be categorized under ATT&CK technique T1068, which covers local privilege escalation through kernel exploits. Systems running affected kernel versions are particularly vulnerable in environments where multiple users share the same machine, as any local user can potentially exploit this vulnerability to gain unauthorized access to kernel memory structures.
Mitigation strategies for CVE-2001-0316 primarily involve upgrading to patched kernel versions where the sysctl function properly validates input parameters and rejects negative arguments that could lead to memory access violations. System administrators should prioritize updating their kernel installations to versions that have addressed this specific vulnerability, as patches typically include proper bounds checking and input validation mechanisms. Additionally, implementing proper access controls and monitoring for unusual sysctl usage patterns can help detect potential exploitation attempts. The vulnerability demonstrates the importance of proper kernel input validation and highlights the critical need for thorough security testing of system call interfaces. Organizations should also consider implementing network segmentation and privilege separation to limit the potential impact of such vulnerabilities. Security monitoring solutions should be configured to detect anomalous sysctl behavior that could indicate exploitation attempts, particularly when negative values are passed to system control functions. Regular security audits and kernel vulnerability assessments remain essential practices for maintaining system integrity against similar flaws that could exist in older or unpatched kernel versions.