CVE-2005-1763 in Linux
Summary
by MITRE
Buffer overflow in ptrace in the Linux Kernel for 64-bit architectures allows local users to write bytes into kernel memory.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability identified as CVE-2005-1763 represents a critical buffer overflow flaw within the Linux kernel's ptrace implementation specifically affecting 64-bit architectures. This issue resides in the kernel's debugging and process tracing mechanism that allows one process to observe and control the execution of another process. The ptrace system call serves as a fundamental component for debugging tools like gdb and strace, enabling developers and system administrators to monitor program execution, inspect memory contents, and manipulate process behavior during debugging sessions.
The technical flaw manifests when the ptrace system call processes certain arguments in 64-bit kernel environments, where insufficient bounds checking occurs during buffer handling operations. This oversight allows local authenticated users with sufficient privileges to exploit the vulnerability by carefully crafting input parameters that exceed the allocated buffer space. The overflow enables attackers to write arbitrary bytes into kernel memory regions, potentially corrupting critical kernel data structures or executing malicious code with elevated privileges. The vulnerability specifically affects the interaction between user-space applications and kernel-space memory management, creating a pathway for privilege escalation attacks that bypass normal security boundaries.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it fundamentally compromises the integrity of the kernel's memory management system. Attackers can leverage this flaw to gain root-level access to compromised systems, potentially leading to complete system takeover and persistent backdoor establishment. The vulnerability affects systems running 64-bit Linux kernels and impacts all applications that utilize ptrace functionality, making it particularly dangerous in environments where debugging and monitoring tools are actively used. The local nature of the exploit means that attackers need only legitimate user access to the system, eliminating the need for remote attack vectors and making the vulnerability particularly concerning for multi-user systems and server environments.
Mitigation strategies for CVE-2005-1763 primarily involve applying the official kernel patches released by Linux kernel maintainers, which address the buffer overflow by implementing proper bounds checking and memory validation routines. System administrators should prioritize updating their kernel versions to patched releases while also implementing additional security measures such as restricting ptrace usage through capability-based controls and monitoring for suspicious ptrace activity. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper input validation in kernel space. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques under the T1068 category, specifically targeting kernel-level privileges through memory corruption exploits. Organizations should also consider implementing process monitoring solutions that can detect anomalous ptrace behavior and maintain regular kernel security audits to identify and remediate similar vulnerabilities before they can be exploited by malicious actors.