CVE-2016-4902 in JPKI User's Software
Summary
by MITRE
Untrusted search path vulnerability in The Public Certification Service for Individuals "The JPKI user's software (for Windows 7 and later)" Ver3.0.1 and earlier, The Public Certification Service for Individuals "The JPKI user's software (for Windows Vista)" Ver3.0.1 and earlier and The Public Certification Service for Individuals "The JPKI user's software" Ver2.6 and earlier allows remote attackers to gain privileges via a Trojan horse DLL in an unspecified directory.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/20/2020
The CVE-2016-4902 vulnerability represents a critical untrusted search path weakness in the JPKI user software developed by The Public Certification Service for Individuals. This vulnerability affects multiple versions of the software across different windows operating systems including Windows 7, Windows Vista, and earlier releases. The flaw stems from improper handling of dynamic link library loading mechanisms within the software's execution environment, creating opportunities for malicious actors to inject unauthorized code through carefully placed Trojan horse DLL files.
This vulnerability operates under the well-known CWE-427 Uncontrolled Search Path Element category, which specifically addresses situations where applications search for libraries or executables in directories that can be manipulated by untrusted parties. The JPKI software's failure to properly validate or restrict the search path for dynamic libraries creates a privilege escalation vector that can be exploited by remote attackers. The vulnerability is particularly concerning because it allows attackers to place malicious DLL files in directories that the software legitimately searches, enabling code execution with elevated privileges.
The operational impact of this vulnerability extends beyond simple code injection as it directly compromises the integrity of the certification service infrastructure. Attackers can leverage this weakness to execute arbitrary code with the privileges of the affected user, potentially leading to unauthorized access to sensitive digital certificates, credential theft, or complete system compromise. The vulnerability affects the trust model of the entire JPKI ecosystem, as any compromised installation could serve as a foothold for broader attacks against the certification infrastructure. This type of vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter and T1546.009 for Server Software Component, as it exploits legitimate software components to achieve malicious objectives.
Mitigation strategies for CVE-2016-4902 should focus on immediate software updates from the vendor, which would address the untrusted search path implementation. Organizations should implement strict directory permissions and monitoring to prevent unauthorized DLL placement in system directories. The principle of least privilege should be enforced by running the JPKI software with minimal required permissions and by implementing application whitelisting policies. Additionally, network segmentation and endpoint detection systems should be deployed to monitor for suspicious DLL loading activities. Security teams should also conduct comprehensive vulnerability assessments to identify any other applications suffering from similar untrusted search path vulnerabilities, as these issues are commonly found in legacy software implementations. The vulnerability underscores the importance of proper software development practices and the need for robust input validation and secure coding methodologies to prevent such dangerous path traversal exploits.