CVE-2005-0749 in Linux
Summary
by MITRE
The load_elf_library in the Linux kernel before 2.6.11.6 allows local users to cause a denial of service (kernel crash) via a crafted ELF library or executable, which causes a free of an invalid pointer.
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Analysis
by VulDB Data Team • 06/01/2019
The vulnerability identified as CVE-2005-0749 represents a critical kernel-level flaw in the Linux operating system that affects versions prior to 2.6.11.6. This issue resides within the load_elf_library function which is responsible for loading executable and shared library files into memory. The vulnerability stems from inadequate input validation and memory management practices within the kernel's ELF loading mechanism, creating a scenario where maliciously crafted ELF files can trigger unexpected behavior in the kernel's memory subsystem.
The technical nature of this vulnerability manifests through a classic use-after-free condition that occurs when the kernel attempts to process specially crafted ELF libraries or executables. When such malformed files are loaded, the load_elf_library function executes code that eventually leads to a call to free() with an invalid memory pointer. This improper memory deallocation causes the kernel to crash and results in a system-wide denial of service condition. The flaw specifically relates to how the kernel handles certain ELF file structures and their associated memory mappings during the loading process, creating a pathway for local attackers to exploit the system's memory management routines.
From an operational perspective, this vulnerability presents significant risks to system stability and availability within Linux environments. Local attackers who can execute code on the target system can leverage this flaw to systematically crash the kernel, rendering the affected machine unusable until manual reboot occurs. The impact extends beyond simple service disruption as kernel crashes can lead to data loss, corruption of system state, and potential compromise of other running services. The vulnerability is particularly concerning in server environments where system uptime and reliability are paramount, as a successful exploitation can result in extended downtime and service interruptions that may affect multiple users or applications dependent on the compromised system.
The exploitation of this vulnerability aligns with several ATT&CK techniques including privilege escalation and denial of service, while mapping to CWE-415 which describes double free conditions and CWE-416 which covers use after free scenarios. Organizations affected by this vulnerability should implement immediate mitigations including upgrading to kernel version 2.6.11.6 or later, which contains the necessary patches to prevent the invalid pointer dereference. Additional protective measures include implementing strict file validation for ELF executables, monitoring for suspicious memory allocation patterns, and maintaining robust system monitoring to detect potential exploitation attempts. System administrators should also consider implementing access controls to limit local user privileges and reduce the attack surface available to potential exploiters. The vulnerability demonstrates the critical importance of proper kernel memory management and input validation in maintaining system integrity and preventing unauthorized disruption of critical services.