CVE-2001-0966 in Nudester
Summary
by MITRE
Directory traversal vulnerability in Nudester 1.10 and earlier allows remote attackers to read or write arbitrary files via a .. (dot dot) in the CD (CWD) command.
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Analysis
by VulDB Data Team • 06/03/2018
The CVE-2001-0966 vulnerability represents a critical directory traversal flaw in Nudester 1.10 and earlier versions of the software. This vulnerability specifically targets the implementation of the CD (change directory) command within the application, allowing malicious actors to manipulate file system access through crafted dot-dot sequences. The flaw exists at the core of how the software processes directory change requests, creating an opportunity for unauthorized file system operations that extend beyond the intended application boundaries.
This directory traversal vulnerability operates by exploiting the lack of proper input validation and sanitization within the CWD command processing mechanism. When a remote attacker sends a specially crafted CD command containing .. sequences, the application fails to properly validate these path components, allowing the traversal to occur. The vulnerability is classified as a CWE-22 weakness, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This weakness enables attackers to access files and directories outside the intended scope of the application's file system access.
The operational impact of this vulnerability extends beyond simple file reading capabilities to encompass arbitrary file writing operations as well. Attackers can leverage this flaw to access sensitive system files, configuration data, or other protected resources within the application's file system hierarchy. The vulnerability allows for complete compromise of the application's file system security boundaries, potentially enabling attackers to escalate privileges, access confidential information, or even execute arbitrary code if the application has sufficient permissions. This represents a fundamental breakdown in the application's security model and can lead to complete system compromise depending on the application's operational context and file system permissions.
The threat landscape for this vulnerability is particularly concerning given that it affects older versions of Nudester, which were likely deployed in environments where security updates were not regularly applied. Attackers can exploit this weakness through network-based attacks without requiring authentication, making it a high-risk vulnerability that can be easily weaponized. The vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) where attackers might use directory traversal to gain access to sensitive files that could then be used for further exploitation. Organizations with legacy systems running affected versions of Nudester should prioritize immediate remediation through software updates or patches that properly validate and sanitize directory change commands to prevent unauthorized file system access.
Mitigation strategies for CVE-2001-0966 should focus on implementing proper input validation and sanitization mechanisms within the application's directory handling code. The most effective approach involves implementing strict path validation that rejects any input containing .. sequences or other potentially dangerous path components. Organizations should also consider implementing proper access controls and privilege separation to limit the impact of successful exploitation attempts. Additionally, deploying web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. The remediation process should include updating to the latest available version of Nudester that addresses this vulnerability, as well as conducting thorough security assessments of all systems running affected software versions to identify potential compromise indicators. Regular security patch management processes should be implemented to prevent similar vulnerabilities from being introduced in the future, with particular attention to input validation and file system access controls.