CVE-2008-1615 in Red Hat
Summary
by MITRE
Linux kernel 2.6.18, and possibly other versions, when running on AMD64 architectures, allows local users to cause a denial of service (crash) via certain ptrace calls.
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Analysis
by VulDB Data Team • 08/10/2019
The vulnerability identified as CVE-2008-1615 represents a critical denial of service flaw within the Linux kernel version 2.6.18 and potentially other variants when operating on AMD64 architectures. This issue specifically exploits weaknesses in the ptrace system call mechanism, which serves as a fundamental debugging and process tracing interface within Unix-like operating systems. The ptrace functionality enables one process to observe and control the execution of another process, making it an essential tool for debugging applications and system monitoring. However, the vulnerability arises from improper handling of certain ptrace operations that can lead to kernel crashes when executed by local users with minimal privileges.
The technical flaw stems from inadequate input validation and memory management within the kernel's ptrace implementation on AMD64 platforms. When specific ptrace system calls are invoked with malformed parameters or in particular sequences, the kernel's memory management subsystem fails to properly handle the operations, resulting in kernel panic conditions and system crashes. This occurs because the kernel does not adequately validate the arguments passed to ptrace calls, particularly when dealing with process tracing operations across different memory contexts. The vulnerability is particularly concerning as it operates at the kernel level, where unauthorized access can lead to complete system compromise. According to CWE classification, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read conditions that can occur in kernel space operations.
The operational impact of CVE-2008-1615 extends beyond simple denial of service, as it provides local attackers with a mechanism to destabilize systems running affected kernel versions. Since the vulnerability requires only local user access, it can be exploited by any user with basic system privileges, making it particularly dangerous in multi-user environments or systems where users might have access to shell accounts. The consequences include complete system crashes, requiring manual reboot procedures and potentially leading to data loss if systems are not properly configured for automatic recovery. In enterprise environments, this vulnerability could be leveraged to disrupt critical services, particularly in scenarios where multiple applications rely on stable kernel operations. The attack vector aligns with ATT&CK technique T1059, which involves the use of command and scripting interpreters, as the exploitation typically involves executing specific shell commands that trigger the vulnerable ptrace operations.
Mitigation strategies for this vulnerability primarily focus on kernel updates and system hardening measures. The most effective solution involves upgrading to kernel versions that have patched this specific vulnerability, with patches typically available through standard distribution repositories. System administrators should implement regular patch management protocols to ensure all systems remain protected against known vulnerabilities. Additionally, implementing strict process monitoring and limiting ptrace usage through security modules such as SELinux or AppArmor can help reduce the attack surface. The principle of least privilege should be enforced, limiting user access to ptrace capabilities to only those processes that absolutely require such debugging functionality. Organizations should also consider implementing intrusion detection systems that can monitor for suspicious ptrace activity patterns, as abnormal usage of this system call could indicate exploitation attempts. Given the nature of the vulnerability, which operates at kernel level, comprehensive system monitoring and automated recovery procedures should be implemented to minimize downtime and ensure service availability in case of exploitation attempts.