CVE-2003-0699 in Linux
Summary
by MITRE
The C-Media PCI sound driver in Linux before 2.4.21 does not use the get_user function to access userspace, which crosses security boundaries and may facilitate the exploitation of vulnerabilities, a different vulnerability than CVE-2003-0700.
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Analysis
by VulDB Data Team • 06/29/2021
The vulnerability described in CVE-2003-0699 represents a critical security flaw in the Linux kernel's handling of user-space memory access within the C-Media PCI sound driver component. This issue affects Linux kernel versions prior to 2.4.21 and demonstrates a fundamental failure in proper memory management practices that could potentially allow malicious users to escalate privileges or execute arbitrary code. The vulnerability stems from the driver's improper handling of data transfers between kernel space and user space contexts, creating a security boundary violation that undermines the fundamental principles of operating system security.
The technical root cause of this vulnerability lies in the driver's failure to utilize the get_user function when accessing user-space memory locations. In Linux kernel development, the get_user function serves as a critical mechanism for safely reading data from user space into kernel space while performing proper validation and access checks. When this function is omitted, the driver directly accesses user-space memory using standard memory access operations, bypassing essential security safeguards that would normally validate memory access permissions and prevent unauthorized data manipulation. This direct memory access pattern creates a potential attack vector where malicious users could craft specially crafted input data that, when processed by the vulnerable driver, could lead to privilege escalation or arbitrary code execution within kernel space.
The operational impact of this vulnerability extends beyond simple memory access violations and represents a significant threat to system integrity and security. Attackers could potentially exploit this weakness to gain elevated privileges within the kernel, allowing them to bypass security controls, access sensitive system resources, or manipulate kernel data structures. The vulnerability's classification as a security boundary crossing issue aligns with CWE-121, which addresses stack-based buffer overflow conditions, and reflects the broader category of kernel-level privilege escalation vulnerabilities. This type of flaw is particularly dangerous because it operates at the kernel level where all system security controls are effectively bypassed, making it a prime target for sophisticated attacks that aim to establish persistent system compromise.
The security implications of CVE-2003-0699 are compounded by its relationship to the broader landscape of Linux kernel security vulnerabilities that were prevalent during the early 2000s. This vulnerability demonstrates the importance of proper kernel memory management practices and the critical need for developers to follow established security guidelines when implementing kernel modules and drivers. The issue also connects to ATT&CK framework techniques related to privilege escalation and kernel exploitation, where adversaries leverage kernel-level vulnerabilities to gain unauthorized access to system resources. Organizations running affected Linux systems were particularly vulnerable to attacks that could exploit this weakness to establish persistent backdoors or execute malicious payloads with full system privileges. The vulnerability highlights the necessity of proper input validation and memory access controls in kernel space, emphasizing that even seemingly minor oversights in driver implementation can result in severe security consequences.
Mitigation strategies for this vulnerability primarily involve updating to Linux kernel version 2.4.21 or later, where the proper use of get_user functions has been implemented in the affected sound driver components. System administrators should also consider implementing additional security measures such as kernel hardening techniques, privilege separation mechanisms, and regular security audits of kernel modules to identify similar issues. The vulnerability serves as a reminder of the critical importance of following established kernel development security practices and maintaining up-to-date system software to protect against known vulnerabilities that could be exploited by adversaries. Organizations should also implement monitoring solutions to detect potential exploitation attempts and maintain comprehensive incident response procedures that account for kernel-level security breaches.