CVE-2001-0222 in Webmin
Summary
by MITRE
webmin 0.84 and earlier allows local users to overwrite and create arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2001-0222 affects webmin versions 0.84 and earlier, representing a critical security flaw that enables local users to manipulate file system operations through symbolic link manipulation. This issue stems from inadequate validation of file operations within the webmin administrative interface, creating opportunities for privilege escalation and arbitrary file manipulation. The vulnerability specifically targets the directory traversal and file creation mechanisms that webmin employs for system administration tasks, making it particularly dangerous in environments where webmin is used for server management.
The technical flaw manifests when local users exploit the lack of proper symlink resolution checks during file operations within webmin's file management functions. Attackers can create malicious symbolic links that point to sensitive system files or directories, then leverage webmin's file handling routines to overwrite or create files at arbitrary locations on the filesystem. This occurs because the application does not properly validate whether file operations are being performed on symbolic links rather than actual files, allowing attackers to bypass normal file system access controls. The vulnerability is classified under CWE-59 as improper file system object resolution, which directly relates to the failure to properly handle symbolic links in file operations.
The operational impact of this vulnerability extends beyond simple file manipulation, as it can enable attackers to escalate privileges and potentially gain unauthorized access to system resources. Local users who can access the webmin interface can exploit this flaw to overwrite critical system files, create backdoor accounts, or modify configuration files that control system behavior. This represents a significant threat to system integrity and can lead to complete system compromise if the webmin service is running with elevated privileges. The vulnerability is particularly concerning because it requires minimal privileges to exploit and can be combined with other local attacks to achieve broader system access. According to ATT&CK framework, this vulnerability maps to T1059.001 for command and scripting interpreter and T1548.001 for abuse of privileges, as it enables local privilege escalation through file system manipulation.
Mitigation strategies for CVE-2001-0222 involve immediate patching of webmin installations to versions that properly validate file operations and resolve symbolic links before executing file system modifications. System administrators should ensure that all webmin installations are updated to the latest stable releases that address this specific vulnerability. Additionally, implementing proper file system permissions and access controls can limit the impact of such attacks, while monitoring for unusual file creation or modification patterns can help detect exploitation attempts. Security measures should include disabling unnecessary webmin functionality, restricting access to the webmin interface, and ensuring that webmin runs with minimal required privileges. Organizations should also conduct regular security assessments to identify and remediate similar vulnerabilities in other system administration tools that may be susceptible to similar symlink attack vectors.