CVE-2010-5254 in Gfi Backup 2009
Summary
by MITRE
Untrusted search path vulnerability in GFI Backup 3.1 Build 20100730 2009 Home Edition allows local users to gain privileges via a Trojan horse ArmAccess.dll file in the current working directory, as demonstrated by a directory that contains a .gbc or .gbt file. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/13/2021
The vulnerability identified as CVE-2010-5254 represents a critical untrusted search path issue within GFI Backup 3.1 Build 20100730 Home Edition, a backup solution designed for Windows environments. This flaw resides in the software's handling of dynamic link library (dll) loading mechanisms and demonstrates how improper path resolution can create significant security risks for end-user systems. The vulnerability specifically affects the home edition of the software released in 2009, making it particularly concerning as older software versions often remain in use within enterprise environments. The attack vector leverages the principle of least privilege by exploiting the software's tendency to load libraries from the current working directory without proper validation or sanitization of the search path.
The technical exploitation mechanism centers on the software's failure to properly validate the source of dynamically loaded libraries. When GFI Backup processes .gbc or .gbt configuration files, it attempts to load the ArmAccess.dll file from the current working directory rather than from a secure, predetermined location. This behavior creates an opportunity for local attackers to place a malicious ArmAccess.dll file in the same directory as the backup configuration file, thereby enabling privilege escalation. The vulnerability stems from the software's reliance on the PATH environment variable and its default search order, which prioritizes the current working directory over system directories, a common pattern in Windows application development that becomes dangerous when not properly secured. The flaw aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses the risk of applications loading libraries from untrusted locations.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exfiltration. Local attackers can leverage this vulnerability to execute arbitrary code with elevated privileges, potentially allowing them to access sensitive backup data, modify system configurations, or establish persistent access points within the target environment. The attack requires local system access and knowledge of the software's file processing behavior, making it particularly dangerous in environments where users may inadvertently execute backup files from untrusted locations or where desktop environments are shared. This vulnerability can be especially problematic in corporate settings where backup configurations are frequently shared or where users may download and execute backup files from external sources without proper security validation. The risk is amplified because the software's behavior is not immediately apparent to users, making detection and prevention challenging.
Mitigation strategies for CVE-2010-5254 should focus on both immediate remediation and long-term security improvements. The most effective immediate solution involves applying vendor patches or upgrading to newer versions of GFI Backup that address the untrusted search path vulnerability. Organizations should also implement strict file access controls and directory permissions to prevent unauthorized DLL injection attempts. System administrators should conduct thorough audits of installed software versions and ensure that all systems are running patched versions of GFI Backup. Additional protective measures include implementing application whitelisting policies, monitoring for suspicious DLL loading behaviors, and educating users about the risks of executing backup files from untrusted sources. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation, demonstrating how seemingly benign software functionality can be exploited for broader security breaches. The vulnerability also highlights the importance of secure coding practices and proper input validation in preventing path traversal and library loading attacks.