CVE-2005-0136 in Linux
Summary
by MITRE
The Linux kernel before 2.6.11 on the Itanium IA64 platform has certain "ptrace corner cases" that allow local users to cause a denial of service (crash) via crafted syscalls, possibly related to MCA/INIT, a different vulnerability than CVE-2005-1761.
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Analysis
by VulDB Data Team • 06/02/2019
The vulnerability described in CVE-2005-0136 represents a critical flaw in the Linux kernel version 2.6.10 and earlier implementations specifically affecting the Itanium IA64 architecture platform. This issue stems from improper handling of ptrace operations during certain system call sequences, creating exploitable corner cases that can be leveraged by local attackers to crash the system. The vulnerability is particularly significant because it affects the kernel's debugging and tracing capabilities, which are fundamental components of system operation and security monitoring.
The technical root cause of this vulnerability lies in the kernel's implementation of ptrace functionality, which is designed to allow one process to observe and control the execution of another process. During specific interactions involving Machine Check Architecture (MCA) and INIT events on the IA64 platform, the kernel fails to properly validate or handle certain ptrace operations, leading to memory corruption and subsequent system crashes. This flaw falls under the CWE-121 category of buffer overflow conditions and is particularly dangerous because it can be triggered through legitimate system calls that are normally used for debugging and system monitoring purposes. The vulnerability is related to but distinct from CVE-2005-1761, indicating a broader class of issues affecting ptrace operations on IA64 systems.
The operational impact of this vulnerability extends beyond simple denial of service, as local users with minimal privileges can exploit this weakness to crash the entire kernel, potentially causing system-wide instability and requiring manual intervention for recovery. This type of vulnerability directly impacts system availability and can be particularly problematic in server environments where continuous operation is critical. The attack vector involves crafting specific sequences of system calls that trigger the ptrace corner cases, making it a sophisticated local privilege escalation threat that can be difficult to detect and prevent. From an attacker's perspective, this vulnerability provides a reliable method to disrupt system services without requiring elevated privileges, making it attractive for both malicious actors and security researchers.
Mitigation strategies for CVE-2005-0136 primarily involve upgrading to Linux kernel version 2.6.11 or later, which contains the necessary patches to address the ptrace corner cases. System administrators should also implement proper access controls to limit local user privileges where possible, as this vulnerability requires local access to exploit. The mitigation aligns with ATT&CK technique T1068 which involves local privilege escalation through kernel vulnerabilities. Additional defensive measures include monitoring for unusual ptrace activity and implementing kernel hardening techniques such as disabling unnecessary debugging features. Organizations should also consider implementing intrusion detection systems that can identify suspicious syscall patterns and maintain regular patching schedules to address similar vulnerabilities in the kernel's tracing and debugging subsystems. The vulnerability demonstrates the importance of thorough testing of system call interfaces, particularly on specialized architectures like IA64 where hardware-specific behaviors can create unexpected interaction patterns within the kernel.