CVE-2002-2360 in Webmin
Summary
by MITRE
The RPC module in Webmin 0.21 through 0.99, when installed without root or admin privileges, allows remote attackers to read and write to arbitrary files and execute arbitrary commands via remote_foreign_require and remote_foreign_call requests.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 12/17/2024
The vulnerability identified as CVE-2002-2360 represents a critical security flaw in the Webmin remote administration tool affecting versions 0.21 through 0.99. This issue stems from insufficient access controls within the RPC module, creating a pathway for remote attackers to execute arbitrary commands and manipulate system files without proper authentication. The vulnerability specifically manifests when Webmin is installed without root or administrative privileges, which is a common deployment scenario in many enterprise environments where administrators seek to limit the privileges of web applications for security reasons. This misconfiguration creates a dangerous paradox where the attempt to enhance security through privilege limitation actually introduces a more severe vulnerability.
The technical exploitation of this vulnerability occurs through two primary attack vectors: remote_foreign_require and remote_foreign_call requests. These mechanisms within the RPC module fail to properly validate or authenticate incoming requests, allowing malicious actors to bypass normal access controls and directly interact with system resources. The flaw operates at the core of Webmin's remote execution capabilities, where legitimate administrative functions are exposed without adequate authorization checks. This vulnerability falls under the CWE-284 access control weakness category, specifically addressing improper access control in remote procedure call implementations. The attack surface is particularly concerning because it enables both read and write operations to arbitrary files, providing attackers with the ability to modify system configurations, inject malicious code, or extract sensitive information from the target system.
The operational impact of CVE-2002-2360 extends beyond simple unauthorized access, as it provides attackers with full command execution capabilities on the underlying system. This means that an attacker could potentially escalate privileges, install backdoors, or completely compromise the system's integrity. The vulnerability affects not just the Webmin interface but the entire underlying operating system, as the RPC module operates with the privileges of the Webmin process itself. In enterprise environments where Webmin is commonly used for system administration, this vulnerability could lead to complete system compromise, data breaches, and unauthorized access to critical infrastructure. The remote nature of the attack means that exploitation can occur from anywhere on the internet, making it particularly dangerous for systems exposed to public networks. This vulnerability directly maps to the MITRE ATT&CK technique T1059 for command and scripting interpreter, where adversaries use legitimate system tools to execute malicious code.
Mitigation strategies for CVE-2002-2360 require immediate action to address the root cause of the vulnerability. The most effective approach involves upgrading to a patched version of Webmin, as the vulnerability was resolved in subsequent releases through proper implementation of access controls and authentication mechanisms. Organizations should also implement network segmentation to limit exposure of Webmin installations to untrusted networks, and consider deploying additional authentication layers such as two-factor authentication or VPN access. The configuration of Webmin should be reviewed to ensure that administrative privileges are properly managed and that unnecessary remote access capabilities are disabled. Security monitoring should be enhanced to detect unusual RPC module activity, particularly unauthorized file access or execution patterns. Additionally, regular security audits should verify that Webmin installations are not running with elevated privileges when they do not require them, as this vulnerability demonstrates how privilege reduction can inadvertently create more severe security issues. Organizations should also consider implementing web application firewalls to filter and monitor RPC module requests, providing an additional layer of protection against this specific class of attack.