CVE-2004-1374 in NetBSD
Summary
by MITRE
Multiple buffer overflows in NetBSD kernel may allow local users to execute arbitrary code and gain privileges.
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Analysis
by VulDB Data Team • 06/22/2018
The vulnerability identified as CVE-2004-1374 represents a critical security flaw within the NetBSD kernel operating system that exposes multiple buffer overflow conditions capable of being exploited by local attackers to execute arbitrary code and elevate privileges. This vulnerability affects the kernel level components of NetBSD systems, making it particularly dangerous as it operates at the core of the operating system where privilege escalation opportunities are most significant. The buffer overflows occur in kernel space functions that handle various system operations, creating opportunities for malicious code injection that bypasses standard user-space security mechanisms. Such vulnerabilities are classified under CWE-121 as Buffer Overflow in Kernel Space, which represents a fundamental weakness in memory management that allows attackers to overwrite critical kernel data structures and execute malicious instructions with the highest system privileges.
The technical implementation of this vulnerability stems from inadequate input validation and memory boundary checking within kernel functions that process user-supplied data. When local users submit malformed input to kernel interfaces, the system fails to properly validate the data length against allocated buffer sizes, resulting in memory corruption that can be leveraged to overwrite kernel memory regions. This type of vulnerability typically manifests when kernel functions perform operations such as copying user data into fixed-size kernel buffers without sufficient bounds checking, creating predictable memory layout conditions that attackers can exploit through carefully crafted input sequences. The exploitation process often involves crafting specific input patterns that cause buffer overflows to overwrite return addresses, function pointers, or other critical kernel data structures, enabling code execution with kernel-level privileges.
From an operational perspective, this vulnerability presents a severe risk to NetBSD systems as it allows local attackers who already have user-level access to escalate their privileges to root level without requiring additional authentication or network access. The attack vector is particularly concerning because it does not require network connectivity or remote exploitation capabilities, meaning that any user with access to the system can potentially exploit this vulnerability. The impact extends beyond simple privilege escalation as successful exploitation can lead to complete system compromise, data theft, persistence mechanisms, and potential lateral movement within network environments. Attackers can leverage this vulnerability to establish backdoors, modify system files, disable security features, or create persistent access points that remain undetected by standard monitoring systems. The vulnerability also affects system integrity and availability as memory corruption can cause system crashes or unpredictable behavior.
Mitigation strategies for CVE-2004-1374 focus on both immediate patching and operational security enhancements. System administrators should prioritize applying the official NetBSD security patches that address the specific buffer overflow conditions in kernel functions. The recommended approach involves updating to patched kernel versions that include proper bounds checking and input validation mechanisms for all affected system calls. Additionally, implementing operational controls such as privilege separation, user access controls, and monitoring for suspicious system activity can help reduce the attack surface and detect exploitation attempts. The vulnerability aligns with ATT&CK technique T1068 which covers Exploitation for Privilege Escalation, and T1543 which covers Create or Modify System Process, as attackers can leverage these kernel vulnerabilities to establish persistent access and modify system processes. Organizations should also consider implementing kernel hardening techniques such as stack canaries, address space layout randomization, and kernel module signing to further reduce exploitability. Regular security assessments and vulnerability scanning should be conducted to identify unpatched systems and ensure comprehensive protection against similar kernel-level vulnerabilities.