CVE-2001-1525 in Easynews
Summary
by MITRE
Directory traversal vulnerability in the comments action in easyNews 1.5 and earlier allows remote attackers to modify news.dat, template.dat and possibly other files via a ".." in the cid parameter.
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability described in CVE-2001-1525 represents a classic directory traversal flaw that affected the easyNews newsgroup management system version 1.5 and earlier. This type of vulnerability falls under the CWE-22 category, which specifically addresses "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')". The flaw exists in the comments action functionality where user input containing directory traversal sequences is not properly sanitized or validated before being processed. When an attacker supplies a cid parameter containing ".." sequences, the application fails to validate the input properly, allowing arbitrary file access and modification capabilities.
The technical exploitation of this vulnerability occurs through the manipulation of the cid parameter in the comments action of the easyNews application. When the application processes this parameter without proper input validation, it allows attackers to navigate up directory levels using the standard ".." notation. This enables unauthorized access to critical system files including news.dat and template.dat, which contain core application data and configuration information. The vulnerability is particularly dangerous because it can potentially allow modification of any file that the web application process has permissions to access, not just the intended target files.
The operational impact of this vulnerability is significant for any organization using the affected easyNews version, as it provides remote attackers with the ability to modify critical application files without authentication. This could lead to complete system compromise, data corruption, or unauthorized modification of newsgroup content and user comments. The vulnerability affects the confidentiality, integrity, and availability of the system by allowing unauthorized file operations that could result in information disclosure, system instability, or complete service disruption. Attackers could potentially overwrite critical configuration files, inject malicious content into templates, or manipulate the newsgroup database to alter or delete content.
Mitigation strategies for this vulnerability should include immediate patching of the easyNews application to version 1.5 or later where the issue has been resolved. Additionally, input validation should be implemented at the application level to sanitize all user-supplied parameters containing directory path information. The principle of least privilege should be enforced by ensuring that the web application runs with minimal required permissions and cannot access sensitive system files. Network-level protections such as web application firewalls can provide additional detection and prevention capabilities. Organizations should also implement proper file access controls and regularly audit system files for unauthorized modifications. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1566 for Phishing, as attackers could use this vulnerability to establish persistence or deliver malicious payloads through compromised template files. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in preventing unauthorized file system access.