CVE-2000-0796 in IRIX
Summary
by MITRE
Buffer overflow in dmplay in IRIX 6.2 and 6.3 allows local users to gain root privileges via a long command line option.
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Analysis
by VulDB Data Team • 10/15/2024
The vulnerability described in CVE-2000-0796 represents a critical buffer overflow flaw within the dmplay utility component of SGI IRIX operating systems version 6.2 and 6.3. This specific implementation flaw exists in the handling of command line arguments where the application fails to properly validate input length before copying data into fixed-size memory buffers. The dmplay utility is part of the IRIX multimedia subsystem and is designed to play audio files through the desktop environment. When a local user provides an excessively long command line option to this utility, the program does not perform adequate bounds checking, allowing memory corruption to occur in the stack memory region. This buffer overflow condition creates an opportunity for privilege escalation as the application executes with elevated privileges typically reserved for system-level operations. The vulnerability specifically affects systems running IRIX 6.2 and 6.3 operating systems where the dmplay utility is installed and accessible to local users. The flaw stems from improper input validation and memory management practices that violate fundamental security principles of buffer size enforcement and stack protection mechanisms. According to CWE classification, this vulnerability maps to CWE-121 which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent stack memory locations. The operational impact of this vulnerability extends beyond simple local privilege escalation as it provides attackers with root-level access to the system, enabling complete compromise of the affected IRIX systems. Attackers can leverage this vulnerability to execute arbitrary code with the highest system privileges, potentially leading to complete system takeover, data exfiltration, or persistent backdoor installation. The vulnerability aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and specifically addresses local privilege escalation vectors. The root cause of this vulnerability lies in the lack of proper input sanitization within the command line argument processing code of dmplay. When the application receives command line parameters, it fails to implement proper length validation before copying arguments into internal buffers, creating a classic stack buffer overflow scenario. This flaw demonstrates the critical importance of input validation and memory safety practices in system-level applications. The exploitation of this vulnerability requires local system access, making it a local privilege escalation issue rather than a remote attack vector. However, the impact remains severe as local users who can execute the dmplay utility can leverage this flaw to elevate their privileges to root level. The vulnerability represents a significant security weakness in the IRIX 6.2 and 6.3 operating system releases and highlights the need for proper software security testing and code review processes. System administrators should immediately implement patches provided by SGI to address this vulnerability and prevent potential exploitation. The recommended mitigation includes applying the official security patches from SGI that correct the buffer overflow issue in dmplay by implementing proper input validation and bounds checking. Additionally, system hardening measures such as restricting local user access to the dmplay utility and implementing proper privilege separation mechanisms can help reduce the attack surface. Organizations should also consider implementing runtime protections and monitoring for suspicious command line argument patterns that could indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure coding practices and proper input validation in system-level software components. This flaw demonstrates how seemingly minor implementation oversights in utility programs can create significant security risks for entire operating system environments. The security implications extend to compliance requirements and regulatory standards where system vulnerabilities must be addressed promptly to maintain security posture and prevent unauthorized access to sensitive system resources.