CVE-2015-7962 in Authentication Service for Outlook Web App Agent
Summary
by MITRE
SafeNet Authentication Service for Outlook Web App Agent uses a weak ACL for unspecified installation directories and executable modules, which allows local users to gain privileges by modifying an executable module.
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Analysis
by VulDB Data Team • 01/09/2020
The SafeNet Authentication Service for Outlook Web App Agent represents a critical security vulnerability identified as CVE-2015-7962, which stems from inadequate access control list implementations within the software's installation directories and executable modules. This weakness creates a fundamental flaw in the privilege management system that governs file access permissions, allowing unauthorized local users to escalate their system privileges through deliberate modification of critical executable components. The vulnerability specifically targets the installation directories where the authentication service operates, exposing sensitive modules to unauthorized modification attempts that bypass normal security boundaries.
The technical implementation flaw manifests through the use of weak discretionary access control lists that fail to properly restrict write permissions for executable modules within the service installation paths. This configuration allows local users with minimal privileges to modify or replace critical executables, thereby enabling privilege escalation attacks. The vulnerability operates under CWE-276 which categorizes improper file permissions as a fundamental weakness in access control mechanisms. The flaw essentially creates a path for attackers to inject malicious code into legitimate service processes, leveraging the trust relationship between the authentication service and the operating system.
From an operational perspective, this vulnerability presents a significant risk to organizations relying on SafeNet Authentication Service for Outlook Web App Agent, as local users can exploit the weak ACL to gain elevated privileges without requiring administrative credentials. The attack vector is particularly concerning because it requires only local system access, making it accessible through various compromise scenarios including credential theft, social engineering, or other initial access methods. Once exploited, the attacker can execute arbitrary code with elevated privileges, potentially leading to complete system compromise and unauthorized access to sensitive email communications and authentication data.
Security practitioners should implement immediate mitigations including verifying and strengthening access control lists for all installation directories related to the SafeNet service, implementing mandatory access controls through Windows file permissions, and conducting thorough audits of executable modules within the service installation paths. The vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through local exploitation, and T1547 which addresses registry run keys and startup folder modifications that could complement such attacks. Organizations must also consider implementing application whitelisting policies and regular security assessments to prevent unauthorized modifications to critical system components, while ensuring that all service installations follow secure configuration guidelines that enforce proper access controls and privilege separation principles.