CVE-2000-0785 in IRC Server
Summary
by MITRE
WircSrv IRC Server 5.07s allows IRC operators to read arbitrary files via the importmotd command, which sets the Message of the Day (MOTD) to the specified file.
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Analysis
by VulDB Data Team • 04/06/2019
The vulnerability identified as CVE-2000-0785 represents a critical path traversal flaw in WircSrv IRC Server version 5.07s that enables authenticated IRC operators to access arbitrary files on the system through the importmotd command. This vulnerability falls under the category of insecure direct object reference as defined by CWE-22 and represents a privilege escalation issue where a user with limited operator privileges can gain unauthorized access to sensitive system files. The flaw exists because the importmotd command does not properly validate or sanitize file paths provided by users, allowing malicious operators to specify absolute paths or traverse directory structures to access files outside the intended scope. This vulnerability is particularly dangerous in multi-tenant environments where multiple users share the same IRC server infrastructure, as it provides a mechanism for operators to bypass normal file system access controls and potentially extract confidential information. The impact extends beyond simple file reading to include potential exposure of system configuration files, user credentials, and other sensitive data that might be stored in accessible locations.
The technical implementation of this vulnerability relies on the lack of proper input validation within the importmotd command processing logic. When an IRC operator executes this command with a malicious file path, the server attempts to read the specified file and set it as the Message of the Day without performing adequate checks to ensure the file path is within acceptable boundaries. This allows attackers to specify paths such as /etc/passwd, /etc/shadow, or other system-critical files that would normally be protected from unauthorized access. The vulnerability demonstrates a classic case of inadequate access control and input sanitization, where the system trusts user-provided data without proper validation. From an operational perspective, this vulnerability enables information disclosure attacks that can provide attackers with detailed insights into the target system's configuration and user management structure. The ATT&CK framework categorizes this under T1005 - Data from Local System, where adversaries can collect sensitive information from compromised systems. The attack vector requires authentication as an IRC operator, making it a privilege escalation vulnerability rather than a remote code execution flaw, though it still represents a significant security risk within the trusted operator community.
The operational impact of CVE-2000-0785 extends far beyond simple information disclosure, as it can lead to comprehensive system reconnaissance and potentially facilitate further attacks. An attacker with operator privileges can use this vulnerability to gather system information that might reveal network topology, user accounts, service configurations, and other sensitive data that could be leveraged in subsequent attacks. The vulnerability also represents a potential means for attackers to identify other system vulnerabilities by examining configuration files or system logs that might be accessible through the same mechanism. From a compliance standpoint, this vulnerability could result in violations of data protection regulations and security standards such as those outlined in ISO 27001 or NIST frameworks, as it allows unauthorized access to protected system information. The flaw also demonstrates poor secure coding practices in the implementation of file access controls, where proper path validation and access restriction mechanisms were not implemented. Organizations using WircSrv 5.07s or similar IRC server implementations should consider this vulnerability as a critical security issue requiring immediate remediation, particularly in environments where operator privileges are not strictly controlled or monitored.
Mitigation strategies for CVE-2000-0785 should focus on implementing proper input validation and access control measures within the IRC server software. The most effective immediate solution involves patching the software to ensure that the importmotd command properly validates file paths and restricts access to only authorized directories. This includes implementing white-listing mechanisms that only allow access to predefined safe locations and rejecting any path that attempts to traverse directories or access system-critical files. Organizations should also implement strict operator privilege controls, ensuring that only trusted individuals have operator access to IRC servers and that these privileges are properly audited and monitored. The implementation of proper logging mechanisms can help detect unauthorized attempts to use the importmotd command with suspicious file paths. Additionally, system administrators should consider implementing network segmentation and access controls to limit the potential impact of such vulnerabilities. From a broader security perspective, this vulnerability highlights the importance of secure coding practices and input validation, particularly in software that handles user-provided data. The vulnerability also underscores the need for regular security assessments and penetration testing to identify similar flaws in legacy systems that may not have been properly updated or patched over time. Organizations should also consider migrating to more modern and secure IRC implementations that have better built-in security controls and are regularly maintained by their vendors.