CVE-2008-1117 in Timbuktu Pro
Summary
by MITRE
Directory traversal vulnerability in the Notes (aka Flash Notes or instant messages) feature in tb2ftp.dll in Timbuktu Pro 8.6.5 for Windows, and possibly 8.7 for Mac OS X, allows remote attackers to upload files to arbitrary locations via a destination filename with a \ (backslash) character followed by ../ (dot dot slash) sequences. NOTE: this can be leveraged for code execution by writing to a Startup folder. NOTE: this issue reportedly exists because of an incomplete fix for CVE-2007-4220.
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Analysis
by VulDB Data Team • 10/07/2024
The vulnerability described in CVE-2008-1117 represents a critical directory traversal flaw within the Notes feature of Timbuktu Pro 8.6.5 for Windows and potentially 8.7 for Mac OS X. This weakness resides in the tb2ftp.dll component and specifically affects how the software handles file destination paths during file upload operations. The vulnerability manifests when remote attackers craft malicious filenames containing backslash characters followed by ../ sequences, enabling them to manipulate the target directory structure and write files to arbitrary locations within the system's file hierarchy.
This directory traversal vulnerability operates at the core of input validation and path handling mechanisms within the Timbuktu Pro application. The flaw stems from inadequate sanitization of user-supplied file paths, allowing attackers to escape the intended upload directory and traverse to sensitive system locations. The issue is particularly dangerous because it can be exploited to write files to critical system folders such as Startup folders, which can lead to persistent code execution and privilege escalation. The vulnerability represents a classic case of improper input validation where the application fails to properly validate or sanitize file paths before processing them, creating a pathway for attackers to manipulate the file system.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it can be leveraged for complete system compromise. By writing malicious files to Startup folders or other system directories, attackers can achieve persistent execution and maintain access to compromised systems. The vulnerability's exploitation potential aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution, while also mapping to CWE-22 directory traversal weakness. The issue's relationship to CVE-2007-4220 indicates a recurring pattern of incomplete security fixes, where previous attempts to address directory traversal vulnerabilities were insufficient or improperly implemented, leaving the system vulnerable to similar exploitation techniques.
Security practitioners should prioritize immediate mitigation of this vulnerability through software updates and patches provided by the vendor. The recommended approach involves implementing strict input validation for all file path parameters and ensuring that the application properly sanitizes and normalizes file paths before processing. Network segmentation and access controls should be implemented to limit exposure of vulnerable systems, while monitoring should be enabled to detect suspicious file upload activities. The vulnerability demonstrates the importance of comprehensive security testing and proper validation of security fixes, as incomplete remediation can leave systems vulnerable to similar attacks. Organizations should also consider implementing application whitelisting policies and restricting write permissions to critical system directories to reduce the potential impact of such exploitation attempts.