CVE-2011-4722 in WhatsUp Gold
Summary
by MITRE
Directory traversal vulnerability in the TFTP Server 1.0.0.24 in Ipswitch WhatsUp Gold allows remote attackers to read arbitrary files via a .. (dot dot) in the Filename field of an RRQ operation.
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Analysis
by VulDB Data Team • 09/01/2024
The vulnerability identified as CVE-2011-4722 represents a critical directory traversal flaw within the TFTP Server component of Ipswitch WhatsUp Gold version 1.0.0.24. This weakness stems from insufficient input validation and sanitization mechanisms that fail to properly restrict file path access during Read Request (RRQ) operations. The vulnerability operates at the application layer and specifically targets the TFTP protocol implementation, which is commonly used for network booting and firmware updates in enterprise environments. Attackers can exploit this flaw by crafting malicious RRQ packets containing directory traversal sequences such as ".." in the filename field, effectively allowing them to navigate beyond the intended file system boundaries and access restricted files on the server.
The technical exploitation of this vulnerability aligns with CWE-22, which categorizes 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 that are not intended to be accessible through the TFTP service, potentially exposing sensitive configuration files, user data, system binaries, or other confidential information. The vulnerability exists because the TFTP server implementation does not adequately sanitize user-supplied input during the RRQ operation processing, allowing maliciously crafted file paths to be interpreted literally rather than being properly validated against a safe file access policy. This flaw operates at the network protocol level and can be leveraged through standard network traffic without requiring elevated privileges or authentication.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can facilitate further attack vectors within the network infrastructure. An attacker who successfully exploits this vulnerability can potentially access critical system files, configuration data, or user credentials stored on the TFTP server, which could lead to privilege escalation or lateral movement within the network. The vulnerability affects enterprise network management systems that rely on WhatsUp Gold for monitoring and management, making it particularly dangerous in environments where network administrators depend on TFTP for device configuration and firmware updates. This flaw can be exploited remotely without requiring any special privileges, making it highly attractive to attackers who seek to gain unauthorized access to network infrastructure components. The vulnerability also aligns with several ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing for Information), as it enables attackers to gather intelligence about the target environment and potentially extract sensitive data.
Mitigation strategies for this vulnerability should include immediate patching of the Ipswitch WhatsUp Gold software to version 1.0.0.25 or later, which contains the necessary fixes for the directory traversal issue. Network administrators should also implement additional security controls such as restricting TFTP access to trusted networks only, implementing network segmentation to isolate the TFTP server from critical systems, and monitoring network traffic for suspicious RRQ operations containing directory traversal sequences. The implementation of proper input validation and sanitization measures within the TFTP server application is essential, ensuring that all user-supplied file paths are properly validated against a whitelist of acceptable directories and file names. Security teams should also consider implementing intrusion detection systems that can identify and alert on suspicious TFTP traffic patterns, particularly those involving directory traversal attempts. Additionally, organizations should conduct regular security assessments of their network management tools and ensure that all third-party applications are kept up to date with the latest security patches to prevent similar vulnerabilities from being exploited in the future.