CVE-2001-0135 in Ultraboard
Summary
by MITRE
The default installation of Ultraboard 2000 2.11 creates the Skins, Database, and Backups directories with world-writeable permissions, which could allow local users to modify sensitive information or possibly insert and execute CGI programs.
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Analysis
by VulDB Data Team • 05/12/2019
The vulnerability described in CVE-2001-0135 represents a critical misconfiguration issue within the default installation of Ultraboard 2000 version 2.11, a web-based bulletin board system that was widely used in the early 2000s for online community forums. This flaw stems from poor privilege management during the software deployment process, where the installation routine fails to properly secure critical system directories that are essential for maintaining the integrity and confidentiality of the platform. The vulnerability specifically affects three core directories: Skins, Database, and Backups, which are fundamental components for the operation and maintenance of the bulletin board system. These directories are created with world-writeable permissions, meaning any local user account on the system can modify, delete, or add files to these locations without proper authorization.
The technical nature of this vulnerability aligns with CWE-732, which describes improper permission assignment for critical resources, and represents a classic example of insecure default configurations that can be exploited by attackers with minimal privileges. When directories are created with world-writeable permissions, they create an attack surface that allows local users to gain unauthorized access to sensitive system components. The Skins directory typically contains presentation files and templates that control the visual appearance of the bulletin board, while the Database directory houses the core data structures that maintain user information, posts, and forum content. The Backups directory stores critical system backup files that may contain sensitive data or system configurations. The combination of these three directories being world-writeable creates multiple potential entry points for malicious activity, as attackers can manipulate any of these components to compromise system integrity.
The operational impact of this vulnerability extends beyond simple data modification capabilities, as local users with write permissions to these directories can potentially execute arbitrary code through CGI program insertion. This represents a significant escalation from basic file manipulation to full system compromise, as CGI (Common Gateway Interface) programs are executable scripts that can be used to process web requests and interact with the underlying system. The ability to insert and execute CGI programs through the backups directory suggests that attackers could potentially place malicious scripts that could be triggered by legitimate system processes or user interactions. This vulnerability undermines the fundamental security model of the system, as it allows attackers to bypass normal access controls and potentially escalate privileges to gain administrative control over the entire bulletin board installation. The impact is particularly severe in multi-user environments where the bulletin board server might be running with elevated privileges or where users have legitimate access to the system but should not have administrative capabilities.
The mitigation strategies for this vulnerability should focus on immediate remediation of the permission settings followed by comprehensive system hardening procedures. System administrators must ensure that all directories created during the installation process are properly secured with restrictive permissions that only allow authorized users or system processes to modify their contents. The principle of least privilege should be enforced, where directories require explicit permissions for specific users or groups rather than allowing universal write access. This vulnerability also highlights the importance of following secure configuration guidelines and conducting regular security audits of installed software components. Organizations should implement automated monitoring systems to detect and alert on unauthorized permission changes to critical directories. The remediation process should include not only correcting the current permissions but also establishing proper baseline configurations for future installations and ensuring that security considerations are integrated into the deployment lifecycle. This vulnerability serves as a reminder of the critical importance of proper system hardening and secure default configurations, as even minor oversights in permission management can create significant security risks that can be exploited by local attackers to compromise entire systems.