CVE-2012-1221 in RabidHamster
Summary
by MITRE
Directory traversal vulnerability in the telnet server in RabidHamster R2/Extreme 1.65 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the File command.
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Analysis
by VulDB Data Team • 09/10/2025
The vulnerability identified as CVE-2012-1221 represents a critical directory traversal flaw within the telnet server implementation of RabidHamster R2/Extreme versions 1.65 and earlier. This security weakness specifically affects the File command functionality, which processes user input to retrieve files from the system. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly restrict directory navigation sequences. Attackers can exploit this flaw by crafting malicious input containing dot-dot sequences that traverse upward through the directory structure, effectively bypassing normal file access controls and gaining unauthorized access to sensitive system files.
The technical implementation of this vulnerability aligns with CWE-22, which classifies directory traversal attacks as a fundamental security flaw in input validation. When the telnet server processes a File command with directory traversal sequences, it fails to properly validate or sanitize the input path before executing file operations. This allows malicious users to manipulate the file system navigation by inserting sequences such as ../ or ..\ that move up the directory hierarchy. The vulnerability operates at the application layer, specifically targeting the file system access controls implemented within the telnet server component. The flaw exists because the system does not properly canonicalize or validate file paths, enabling attackers to access files outside of the intended directory boundaries.
From an operational impact perspective, this vulnerability poses significant risks to system security and data integrity. Remote attackers can leverage this weakness to access sensitive configuration files, system logs, authentication data, and potentially system binaries that should remain protected from unauthorized access. The remote nature of the attack means that adversaries do not require physical access to the system or local network privileges to exploit this vulnerability. The impact extends beyond simple information disclosure, as attackers may be able to access files containing credentials, private keys, or other sensitive data that could lead to further system compromise. This vulnerability directly violates the principle of least privilege and undermines the security boundaries that protect system resources from unauthorized access.
The exploitation of CVE-2012-1221 aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and credential access. Attackers may use this vulnerability as an initial foothold to gather intelligence about the system configuration and identify potential targets for further exploitation. The vulnerability also relates to ATT&CK technique T1078 which covers valid accounts and T1566 which covers credential harvesting. Organizations should implement immediate mitigations including updating to patched versions of RabidHamster R2/Extreme, implementing proper input validation for all file access operations, and restricting telnet access to trusted networks only. Network segmentation and firewall rules can help limit the exposure of vulnerable telnet services, while regular security audits should verify that no unauthorized file access paths remain accessible through other service interfaces. The vulnerability demonstrates the critical importance of proper input validation and access control implementation in network services, particularly those that handle file system operations.