CVE-2017-2226 in Advance Preparation for e-Tax Software
Summary
by MITRE
Untrusted search path vulnerability in Setup file of advance preparation for e-Tax software (WEB version) (1.17.1) and earlier allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.
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Analysis
by VulDB Data Team • 12/31/2020
The vulnerability identified as CVE-2017-2226 represents a critical untrusted search path issue within the setup component of e-Tax software web version 1.17.1 and earlier releases. This flaw resides in the advance preparation module responsible for installing and configuring the software environment. The vulnerability stems from improper handling of dynamic link library loading mechanisms during the installation process, creating opportunities for malicious code execution through DLL injection techniques. The software's installer fails to properly validate or sanitize the search paths used to locate required libraries, allowing attackers to place malicious DLL files in directories that are searched before legitimate system locations.
This vulnerability directly maps to CWE-427 Uncontrolled Search Path Element, which specifically addresses situations where applications search for libraries or executables in directories that can be manipulated by untrusted users. The flaw enables privilege escalation through a Trojan horse attack vector, where an attacker places a malicious DLL file in a location that gets prioritized during the installation process. The software's setup routine does not implement proper path validation or use of secure library loading mechanisms, making it susceptible to attackers who can manipulate the system's library search order. The unspecified directory mentioned in the description indicates that the vulnerability affects multiple potential locations where attackers could deploy malicious payloads, including user-accessible directories or temporary folders.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass full system compromise capabilities. Attackers exploiting this flaw can execute arbitrary code with the privileges of the user running the installer, potentially leading to complete system takeover. The vulnerability is particularly dangerous because it affects the installation phase of the software, which typically runs with elevated privileges to modify system files and registry entries. This creates a window of opportunity where attackers can inject malicious code that persists beyond the installation process, potentially establishing backdoors or exfiltrating sensitive data. The attack surface is further expanded by the fact that the vulnerability exists in the web version of the software, which may be deployed across multiple systems in enterprise environments.
Mitigation strategies for CVE-2017-2226 should focus on implementing secure coding practices and system hardening measures. Organizations should apply the vendor-provided patches or updates that address the untrusted search path issue in the e-Tax software installation component. System administrators should implement proper directory permissions and access controls to prevent unauthorized DLL placement in installation directories. The principle of least privilege should be enforced during installation processes, ensuring that setup programs run with minimal required permissions. Additionally, security monitoring should include detection of suspicious DLL loading activities and unusual file placement patterns in system directories. Network segmentation and application whitelisting can provide additional layers of defense against exploitation attempts. The vulnerability also highlights the importance of following secure development practices such as those outlined in the OWASP Secure Coding Practices, particularly regarding library loading and path resolution. Organizations should conduct regular security assessments of their software installation processes to identify similar untrusted search path vulnerabilities in other applications and systems.