CVE-2000-0952 in Global
Summary
by MITRE
global.cgi CGI program in Global 3.55 and earlier on NetBSD allows remote attackers to execute arbitrary commands via shell metacharacters.
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Analysis
by VulDB Data Team • 10/12/2025
The vulnerability described in CVE-2000-0952 represents a critical command injection flaw in the global.cgi CGI program version 3.55 and earlier that was distributed with the Global web server software running on NetBSD operating systems. This vulnerability arises from insufficient input validation within the CGI script, specifically in how it processes user-supplied parameters before incorporating them into system commands. The flaw enables remote attackers to inject shell metacharacters that are then interpreted and executed by the underlying operating system, effectively allowing unauthorized command execution on the affected system. The vulnerability is classified as a command injection weakness that directly violates security principles of input sanitization and proper parameter handling in web applications.
The technical implementation of this vulnerability stems from the CGI program's failure to properly sanitize or escape user input before passing it to shell commands. When the global.cgi script receives parameters from HTTP requests, it directly incorporates these values into system calls without adequate validation or filtering mechanisms. This allows attackers to append shell metacharacters such as semicolons, ampersands, or backticks to the input parameters, which are then interpreted by the shell as command separators or operators. The vulnerability aligns with CWE-78, which specifically addresses the improper neutralization of special elements used in OS commands, and represents a classic example of a buffer overflow or injection vulnerability in web application interfaces. The attack vector is particularly dangerous because it requires no local system access or authentication, making it exploitable over the network by any remote attacker who can send HTTP requests to the vulnerable web server.
The operational impact of CVE-2000-0952 is severe and potentially catastrophic for affected systems. Successful exploitation grants attackers full command execution privileges on the compromised server, enabling them to perform actions such as reading or modifying sensitive files, creating or deleting user accounts, installing malware, or even establishing persistent backdoors. The vulnerability effectively provides attackers with a complete system compromise, as the CGI program typically runs with elevated privileges necessary to execute system-level commands. This type of vulnerability is particularly dangerous in web server environments where the CGI program may have access to system resources, databases, or other sensitive components. The attack surface extends beyond simple command execution to include potential privilege escalation opportunities, as attackers can leverage the compromised CGI script to gain deeper access to the underlying system infrastructure. This vulnerability directly maps to ATT&CK technique T1059, which covers command and scripting interpreter, and represents a fundamental failure in secure coding practices that allows for arbitrary code execution.
Mitigation strategies for CVE-2000-0952 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The primary solution involves upgrading to a patched version of the Global web server software, as version 3.56 and later included proper input validation and sanitization mechanisms. System administrators should also implement proper web application firewalls and input filtering rules to prevent malicious payloads from reaching the CGI script. Additionally, the principle of least privilege should be enforced by running the web server with minimal required permissions and avoiding execution of system commands from user inputs. Network segmentation and access controls should be implemented to limit exposure of vulnerable CGI scripts to untrusted networks. Organizations should also consider implementing regular security assessments and penetration testing to identify similar vulnerabilities in legacy applications, as this type of flaw was common in older web server implementations and represents a pattern that continues to appear in modern applications. The vulnerability serves as a critical reminder of the importance of secure coding practices and input validation in web applications, particularly in environments where CGI scripts are used to interface with system-level operations.