CVE-2001-0758 in Shambala Server
Summary
by MITRE
Directory traversal vulnerability in Shambala 4.5 allows remote attackers to escape the FTP root directory via "CWD ..." command.
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Analysis
by VulDB Data Team • 04/09/2019
The vulnerability identified as CVE-2001-0758 represents a critical directory traversal flaw in the Shambala 4.5 FTP server implementation that fundamentally compromises the security boundaries of the file system. This vulnerability specifically targets the CWD command functionality within the FTP protocol, allowing remote attackers to manipulate directory navigation paths and escape the designated FTP root directory. The flaw stems from inadequate input validation and path resolution mechanisms within the server's handling of directory change operations, creating an exploitable condition that can be leveraged to access arbitrary files and directories beyond the intended restricted scope.
The technical exploitation of this vulnerability occurs through malformed CWD commands that contain sequences such as "../" or similar path traversal patterns, which the Shambala 4.5 server fails to properly sanitize or validate. When an attacker submits such commands, the server processes these traversal sequences without adequate boundary checking, effectively allowing the attacker to navigate up the directory hierarchy and access files outside the designated FTP root directory. This represents a classic implementation flaw where the server does not properly enforce the security boundaries that should prevent unauthorized access to system resources, making it susceptible to privilege escalation and information disclosure attacks.
From an operational impact perspective, this vulnerability creates severe security implications for systems running Shambala 4.5 FTP servers, as it allows attackers to potentially access sensitive system files, configuration data, user credentials, and other confidential information stored outside the intended FTP access scope. The vulnerability enables attackers to perform reconnaissance activities, extract valuable data, and potentially establish persistent access to the underlying system. The remote nature of the attack means that exploitation can occur from any network location without requiring local system access, making it particularly dangerous for publicly accessible FTP services. This type of vulnerability directly violates the principle of least privilege and can lead to complete system compromise if sensitive files are accessible through the FTP service.
Security practitioners should implement immediate mitigations including applying vendor patches or upgrading to versions that properly validate directory traversal sequences in CWD commands. Network segmentation and firewall rules should be configured to restrict FTP access to trusted networks only, while monitoring systems should be deployed to detect suspicious CWD command sequences. The vulnerability aligns with CWE-22 Directory Traversal and follows patterns commonly associated with ATT&CK technique T1078 Valid Accounts, as attackers can leverage this vulnerability to gain unauthorized access to system resources. Additionally, implementing proper input validation, sanitization of user-supplied paths, and enforcing strict directory access controls should be part of the remediation strategy. Organizations should also conduct thorough security assessments of their FTP infrastructure to identify similar vulnerabilities in other services and ensure that all file system access controls are properly enforced to prevent unauthorized directory traversal attacks.