CVE-2015-7967 in Authentication Service for Citrix Web Interface Agent
Summary
by MITRE
SafeNet Authentication Service for Citrix Web Interface Agent uses a weak ACL for unspecified installation directories and executable modules, which allows local users to gain privileges by modifying an executable module.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 01/10/2020
The SafeNet Authentication Service for Citrix Web Interface Agent vulnerability CVE-2015-7967 represents a critical access control flaw that undermines the security posture of authentication systems. This vulnerability specifically targets the installation directories and executable modules of the SafeNet service, which is designed to provide secure authentication for Citrix web interfaces. The weakness lies in the implementation of Access Control Lists that fail to properly restrict write permissions for critical system components. According to CWE-276, this corresponds to incorrect permissions for critical resources, where the system fails to enforce proper access controls that should prevent unauthorized modification of executable files. The vulnerability creates a dangerous scenario where local users can escalate their privileges by simply modifying specific executable modules within the service installation paths.
The technical exploitation of this vulnerability involves a straightforward privilege escalation attack vector where an attacker with local system access can modify executable files that are part of the SafeNet Authentication Service. The weak ACL implementation allows for write access to directories that should be protected, enabling modification of critical modules that handle authentication processes. When these modified executables are subsequently invoked, they execute with elevated privileges, typically those of the system or service account that owns the authentication service. This represents a classic privilege escalation attack pattern that aligns with ATT&CK technique T1068, which focuses on local privilege escalation through exploitation of system vulnerabilities. The flaw essentially creates a backdoor path where any user can manipulate the authentication service to gain elevated system access.
The operational impact of CVE-2015-7967 extends beyond simple privilege escalation to potentially compromise entire authentication infrastructures. Organizations relying on SafeNet Authentication Service for Citrix Web Interface are at risk of unauthorized access to sensitive systems and data. The vulnerability affects the integrity of the authentication process, potentially allowing attackers to bypass authentication mechanisms entirely. This creates a cascading security risk where successful exploitation can lead to lateral movement within networks, as the compromised authentication service may be used to gain access to additional systems. The impact is particularly severe in environments where Citrix web interfaces are used for remote access to corporate networks, as the vulnerability could enable attackers to establish persistent access to enterprise resources. Organizations with multiple Citrix deployments using SafeNet Authentication Service are particularly vulnerable, as the attack surface expands with each installation.
Mitigation strategies for CVE-2015-7967 require immediate attention to correct the ACL configurations and implement proper access controls for critical service directories. System administrators should conduct comprehensive audits of installation directories and ensure that only authorized accounts have write permissions to executable modules. The recommended approach includes implementing proper discretionary access control mechanisms that align with security best practices, ensuring that service accounts have minimal required permissions. Organizations should also consider implementing mandatory access controls through security policies that enforce strict separation of privileges. Additionally, regular security assessments should be conducted to identify and remediate similar weak ACL configurations across other authentication services and system components. The vulnerability highlights the importance of proper privilege management and access control implementation, which aligns with security frameworks such as NIST SP 800-53 and ISO 27001 controls for access control management. System hardening procedures should include regular reviews of file and directory permissions, particularly for authentication and security-critical services.