CVE-1999-0733 in Workstation
Summary
by MITRE
Buffer overflow in VMWare 1.0.1 for Linux via a long HOME environmental variable.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 11/03/2024
The vulnerability described in CVE-1999-0733 represents a classic buffer overflow flaw that existed in VMware Workstation version 1.0.1 for Linux operating systems. This security issue emerged from the improper handling of environment variables during the application's initialization process, specifically when processing the HOME environment variable that users typically set in their shell environments. The flaw allowed attackers to manipulate the application's memory management through carefully crafted input data, creating a potential avenue for arbitrary code execution within the target system's context.
The technical implementation of this buffer overflow stems from insufficient bounds checking in VMware's Linux implementation when parsing the HOME environment variable. When the application launched, it would read the HOME variable and copy its contents into a fixed-size buffer without proper validation of the input length. This design flaw directly maps to CWE-121, which describes heap-based buffer overflow conditions where insufficient checks are performed on the size of input data before copying it into a fixed-length buffer. The vulnerability exploited the application's failure to implement proper input sanitization and memory boundary validation, allowing attackers to overwrite adjacent memory locations and potentially execute malicious code with the privileges of the running VMware process.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it creates a significant attack surface for privilege escalation and system compromise. An attacker who successfully exploited this buffer overflow could potentially gain unauthorized access to the underlying system resources, manipulate virtual machine configurations, or execute arbitrary commands with elevated privileges. The vulnerability particularly affects environments where VMware Workstation runs with elevated permissions, as the buffer overflow could be leveraged to bypass user access controls and establish persistent access to the host system. This type of vulnerability aligns with ATT&CK technique T1068, which covers local privilege escalation through the exploitation of software vulnerabilities, and T1059, covering command and scripting interpreters used for execution.
Mitigation strategies for this vulnerability require immediate patching of the affected VMware Workstation version 1.0.1, as no effective workarounds exist for this specific buffer overflow condition. Organizations should implement comprehensive patch management procedures to ensure all virtualization software components remain current with security updates from vendors. System administrators should also consider implementing environment variable restrictions and monitoring for unusual HOME variable values that might indicate attempted exploitation attempts. Additional defensive measures include deploying application whitelisting policies to restrict execution of unauthorized binaries and monitoring for suspicious memory access patterns that could indicate buffer overflow exploitation attempts. The vulnerability underscores the critical importance of proper input validation and bounds checking in system software development, particularly for applications that handle user-supplied data in privileged contexts. This flaw serves as a historical example of how seemingly minor implementation oversights in software design can create significant security risks that persist across multiple system components and potentially compromise entire computing environments.