CVE-2010-3161 in TeraPad
Summary
by MITRE
Untrusted search path vulnerability in TeraPad before 1.00 allows local users to gain privileges via a Trojan horse DLL in the current working directory.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/08/2019
The vulnerability identified as CVE-2010-3161 represents a classic untrusted search path issue affecting TeraPad versions prior to 1.00. This flaw resides in the software's dynamic link library loading mechanism where the application fails to properly validate the source of loaded libraries. The vulnerability stems from the application's tendency to search for required DLL files in the current working directory before examining system directories, creating an exploitable condition that adversaries can leverage for privilege escalation.
This security weakness aligns with CWE-427, which specifically addresses uncontrolled search path dependencies in software applications. The vulnerability operates under the principle that when an application loads DLLs without specifying absolute paths, it will first search in the current working directory, followed by system directories in a predetermined order. This behavior creates an opportunity for malicious actors to place a specially crafted Trojan horse DLL in the same directory as the target application, causing the system to load the malicious code instead of the legitimate library. The flaw demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under technique T1068, which covers privilege escalation through the exploitation of dynamic link library loading mechanisms.
The operational impact of this vulnerability is significant as it enables local users to achieve privilege escalation without requiring remote access or complex attack vectors. An attacker with local system access can simply place a malicious DLL file in the directory where TeraPad is executed, effectively hijacking the application's execution flow. This allows the malicious code to run with the privileges of the target application, potentially enabling access to sensitive system resources, data exfiltration, or further escalation within the compromised system. The vulnerability's exploitability is enhanced by the fact that it does not require elevated privileges to set up the malicious DLL in the working directory, making it particularly dangerous in environments where multiple users have access to the same system.
Mitigation strategies for CVE-2010-3161 should focus on implementing proper DLL loading practices and strengthening the application's security posture. The most effective approach involves modifying the application to use absolute paths when loading DLLs, thereby preventing the search path from being manipulated by attackers. Additionally, developers should implement secure coding practices that include validating library sources and using Windows' built-in security features such as DLL side-loading protections. System administrators should ensure that TeraPad is updated to version 1.00 or later, which contains the necessary patches to address this vulnerability. Network security measures such as file integrity monitoring and access controls can also help detect and prevent the placement of malicious DLL files in system directories. Organizations should also consider implementing application whitelisting policies that restrict which executables and libraries can run on their systems, reducing the effectiveness of this type of attack vector.