CVE-2005-2731 in Security Linux
Summary
by MITRE
Directory traversal vulnerability in Astaro Security Linux 6.0, when using Webmin, allows remote authenticated webmin users to read arbitrary files via a .. (dot dot) in the wfe_download parameter to index.fpl.
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Analysis
by VulDB Data Team • 07/29/2017
The vulnerability identified as CVE-2005-2731 represents a critical directory traversal flaw affecting Astaro Security Linux 6.0 systems utilizing Webmin management interface. This security weakness stems from insufficient input validation within the Webmin component, specifically in how it processes file download requests through the index.fpl script. The vulnerability manifests when authenticated Webmin users exploit the wfe_download parameter by incorporating directory traversal sequences using the .. (dot dot) notation, enabling them to access files outside the intended directory structure.
The technical implementation of this vulnerability resides in the improper sanitization of user-supplied input within the Webmin web interface. When a user submits a request containing the wfe_download parameter with directory traversal sequences, the system fails to adequately validate or sanitize the input before processing file operations. This allows attackers to manipulate file paths and access sensitive system files that should remain restricted to authorized personnel only. The flaw operates at the application layer and specifically targets the file handling mechanisms within the Webmin framework, creating an unauthorized access vector that bypasses normal file system security controls.
From an operational impact perspective, this vulnerability poses significant risks to system security and data integrity. Authenticated Webmin users can leverage this weakness to access configuration files, log files, system credentials, and potentially sensitive business data stored on the affected system. The attack requires only valid Webmin credentials, making it particularly dangerous as it can be exploited by compromised accounts or insider threats. The vulnerability essentially grants attackers the ability to perform unauthorized file system reconnaissance and data exfiltration, potentially leading to complete system compromise and unauthorized access to critical infrastructure components.
The vulnerability maps directly to CWE-22 - Improper Limiting of a Pathname to a Restricted Directory, which categorizes weaknesses related to insufficient validation of file paths and directory traversal attacks. This weakness falls under the broader category of path traversal vulnerabilities that have been consistently identified as critical security flaws across numerous applications and systems. From an ATT&CK framework perspective, this vulnerability aligns with T1005 - Data from Local System and T1059 - Command and Scripting Interpreter, as it enables adversaries to access system files and potentially execute further malicious activities through the compromised Webmin interface. The exploitation of this vulnerability also relates to T1566 - Phishing with Social Engineering, as it may be leveraged in post-compromise reconnaissance phases.
Mitigation strategies for CVE-2005-2731 should prioritize immediate patching of affected systems with the latest Webmin security updates from the vendor. System administrators must ensure that all Webmin installations are updated to versions that properly validate and sanitize user input before processing file operations. Additionally, implementing network segmentation and access controls can limit the exposure of Webmin interfaces to only necessary administrative users. Regular security audits should verify that no directory traversal vulnerabilities exist in other web applications, and implementing web application firewalls can provide additional protection against such attacks. Organizations should also enforce strict access controls and monitor Webmin login activities for suspicious file access patterns, as these activities may indicate exploitation attempts.