CVE-2000-0527 in Mailstudio 2000
Summary
by MITRE
userreg.cgi CGI program in MailStudio 2000 2.0 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters.
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Analysis
by VulDB Data Team • 07/07/2024
The vulnerability identified as CVE-2000-0527 affects the userreg.cgi CGI program within MailStudio 2000 version 2.0 and earlier installations. This represents a critical security flaw that stems from inadequate input validation within the web application's user registration component. The vulnerability exists in the way the application processes user-supplied data through the CGI interface, creating an avenue for malicious actors to inject and execute arbitrary commands on the underlying system. The flaw specifically manifests when the application fails to properly sanitize or escape shell metacharacters that are passed through the user registration form, allowing attackers to leverage these characters to manipulate the system's command execution flow.
This vulnerability operates at the intersection of multiple security domains, fundamentally exploiting a command injection weakness that aligns with CWE-77 and CWE-94 classifications. The issue represents a classic example of unsafe command construction where user input directly influences system command execution without proper sanitization. The attack vector is particularly dangerous because it enables remote code execution from outside the network perimeter, requiring no authentication or prior access to the system. From an operational perspective, this vulnerability provides attackers with the capability to execute arbitrary commands with the privileges of the web server process, potentially leading to complete system compromise. The impact extends beyond simple command execution to include potential privilege escalation, data exfiltration, and persistence mechanisms that attackers can establish within the compromised environment.
The operational implications of this vulnerability are severe and multifaceted, as it essentially grants remote attackers complete control over the affected system. When exploited, the vulnerability allows for arbitrary code execution through shell metacharacters such as semicolons, ampersands, or backticks that are commonly used in Unix-like operating systems to chain commands or execute system utilities. Attackers can leverage this to install backdoors, modify system files, steal sensitive data, or use the compromised system as a launch point for further attacks within the network infrastructure. The vulnerability's persistence across multiple versions of MailStudio 2000 indicates a fundamental design flaw in the application's security architecture that was not adequately addressed through patching or code review processes. Organizations running affected versions face significant risk of unauthorized access and potential data breaches, as the vulnerability can be exploited without requiring specialized knowledge or tools beyond basic web exploitation techniques.
Mitigation strategies for CVE-2000-0527 must address both immediate remediation and long-term architectural improvements. The primary recommendation involves applying the vendor-supplied patches or upgrading to versions of MailStudio 2000 that have addressed this vulnerability. Additionally, implementing proper input validation and sanitization mechanisms should be enforced at all points where user input is processed, particularly within CGI applications. Network-level protections including web application firewalls and intrusion prevention systems can provide additional layers of defense by monitoring for suspicious command injection patterns. From a defensive perspective, organizations should implement principle of least privilege for web server accounts, ensuring that the web server process operates with minimal required permissions to reduce the potential impact of successful exploitation. The vulnerability also highlights the importance of regular security assessments and vulnerability scanning to identify similar weaknesses in legacy applications that may not receive ongoing security support or updates from vendors.