CVE-2017-9758 in Driver Package
Summary
by MITRE
Savitech driver packages for Windows silently install a self-signed certificate into the Trusted Root Certification Authorities store, aka "Inaudible Subversion."
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability described in CVE-2017-9758 represents a sophisticated supply chain attack vector that exploits the trust relationships within Windows operating systems. This issue affects Savitech driver packages for Windows that, when installed, automatically place a self-signed certificate into the Trusted Root Certification Authorities store without user consent or awareness. The technical flaw stems from the driver installation process failing to properly validate or notify users about the certificate installation, creating a persistent backdoor that can be leveraged for malicious activities. This vulnerability specifically targets the core trust infrastructure of Windows systems, where the Trusted Root Certification Authorities store contains certificates that are implicitly trusted by the operating system for validating digital signatures and secure communications.
The operational impact of this vulnerability is severe and multifaceted, as it enables attackers to establish persistent, undetectable man-in-the-middle capabilities within network environments. When a self-signed certificate is installed into the Trusted Root Certification Authorities store, it effectively becomes trusted by all applications and services running on the compromised system, including web browsers, email clients, and security software. This allows adversaries to intercept encrypted communications, forge digital signatures, and potentially compromise the integrity of secure connections. The term "Inaudible Subversion" aptly describes how this attack operates silently in the background, bypassing traditional security controls and user awareness mechanisms that would normally alert administrators to certificate installation activities.
This vulnerability aligns with several cybersecurity frameworks and attack patterns, particularly those related to credential access and privilege escalation. From a CWE perspective, this issue relates to CWE-295 which deals with improper certificate validation, and CWE-310 which addresses cryptographic issues. The attack pattern follows the MITRE ATT&CK framework's Credential Access techniques, specifically targeting the use of valid credentials through certificate manipulation. The vulnerability also demonstrates characteristics of the Privilege Escalation category, as the installation of trusted certificates can potentially enable further system compromise and access to sensitive resources. Additionally, this represents a supply chain attack vector that can be categorized under the MITRE ATT&CK technique T1133 for External Remote Services, where compromised drivers provide persistent access to target systems.
The mitigation strategies for this vulnerability require a multi-layered approach that addresses both immediate remediation and long-term prevention measures. Organizations should immediately audit their systems for the presence of the affected Savitech driver packages and remove them from all endpoints. The certificate installation process should be monitored through security event logging, particularly focusing on certificate store modifications in the Trusted Root Certification Authorities store. Network security controls should be enhanced to detect and block suspicious certificate-based activities, including implementing certificate pinning for critical applications and services. System administrators should also consider implementing application control policies that restrict the installation of unsigned or untrusted drivers, and establish regular certificate store audits to identify unauthorized certificate additions. The vulnerability underscores the importance of maintaining strict control over certificate trust relationships and implementing defense-in-depth strategies that protect against both known and unknown threats within the system's trust infrastructure.