CVE-2008-0600 in Linux
Summary
by MITRE
The vmsplice_to_pipe function in Linux kernel 2.6.17 through 2.6.24.1 does not validate a certain userspace pointer before dereference, which allows local users to gain root privileges via crafted arguments in a vmsplice system call, a different vulnerability than CVE-2008-0009 and CVE-2008-0010.
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Analysis
by VulDB Data Team • 10/17/2024
The vulnerability identified as CVE-2008-0600 represents a critical privilege escalation flaw within the Linux kernel's memory management subsystem. This issue affects kernel versions ranging from 2.6.17 through 2.6.24.1, where the vmsplice_to_pipe function fails to properly validate user-space pointers before attempting to dereference them. The vulnerability stems from inadequate input sanitization in the kernel's virtual memory management interface, specifically within the vmsplice system call implementation that facilitates efficient data transfer between user-space and kernel-space buffers. This flaw allows local attackers with minimal privileges to manipulate kernel memory structures through carefully crafted system call arguments, ultimately enabling them to escalate their privileges to root level access. The vulnerability operates at the intersection of kernel memory management and privilege control mechanisms, making it particularly dangerous as it exploits the fundamental trust relationship between user-space applications and kernel-space operations.
The technical exploitation of CVE-2008-0600 relies on the kernel's failure to validate pointer parameters within the vmsplice_to_pipe function, which is part of the Linux kernel's virtual memory management system. When a user-space application invokes the vmsplice system call with maliciously constructed arguments, the kernel's vmsplice_to_pipe function processes these inputs without proper validation of the user-space pointer addresses. This allows an attacker to manipulate kernel memory locations through controlled pointer dereferences, effectively bypassing kernel security mechanisms. The vulnerability specifically targets the kernel's pipe buffer management system where vmsplice operations are used to efficiently transfer data between memory regions. The flaw creates a path where unvalidated user input can directly influence kernel execution flow, enabling attackers to manipulate kernel data structures and ultimately escalate privileges through controlled memory corruption.
The operational impact of CVE-2008-0600 extends beyond simple privilege escalation as it represents a fundamental breakdown in kernel security boundaries. Local attackers can leverage this vulnerability to gain root access on affected systems, potentially leading to complete system compromise and persistent backdoor establishment. The vulnerability's exploitation requires only local access and does not necessitate network connectivity or specific external conditions, making it particularly dangerous in environments where local user accounts exist. This flaw directly impacts system integrity and confidentiality by allowing unauthorized privilege escalation, potentially enabling attackers to modify system files, install malware, or establish persistent access. The vulnerability affects systems running Linux kernel versions within the specified range, which includes numerous enterprise and server deployments, potentially exposing a wide range of infrastructure to compromise.
Mitigation strategies for CVE-2008-0600 focus on both immediate patching and operational security measures. The most effective solution involves upgrading to Linux kernel versions 2.6.24.2 or later, where the vulnerability has been addressed through proper pointer validation in the vmsplice_to_pipe function. System administrators should prioritize patch deployment across all affected systems, particularly those running kernel versions in the vulnerable range. Additionally, implementing kernel security modules such as grsecurity or PaX can provide additional protection through stack canaries, address space layout randomization, and other exploit mitigation techniques. Operational security measures should include monitoring for suspicious vmsplice system call usage patterns and implementing least privilege principles to minimize potential impact from successful exploitation attempts. The vulnerability aligns with CWE-125: "Out-of-bounds Read" and represents a specific implementation of improper input validation, while also mapping to ATT&CK technique T1068: "Exploitation for Privilege Escalation" through the use of kernel-level vulnerabilities to gain administrative access to systems.