CVE-2018-18766 in SiteKiosk
Summary
by MITRE
An elevation of privilege vulnerability exists in the Call Dispatcher in Provisio SiteKiosk before 9.7.4905.
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Analysis
by VulDB Data Team • 05/23/2020
The vulnerability identified as CVE-2018-18766 represents a critical elevation of privilege flaw within the Call Dispatcher component of Provisio SiteKiosk software versions prior to 9.7.4905. This issue specifically targets the security mechanisms that govern user access and privilege levels within the SiteKiosk environment, which is widely deployed in public access computing scenarios such as libraries, government offices, and retail establishments. The vulnerability stems from insufficient validation of user permissions and inadequate access control enforcement within the call dispatcher subsystem that manages incoming calls and user interactions. The flaw allows authenticated users to escalate their privileges from standard user level to administrative or system-level access without proper authorization checks.
The technical implementation of this vulnerability resides in the improper handling of privilege escalation requests within the call dispatcher module. When users interact with the call management system, the software fails to properly validate whether the requesting user possesses sufficient privileges to execute certain administrative functions. This weakness creates an exploitable path where malicious users can manipulate the system to gain elevated permissions through crafted call requests or by exploiting the underlying privilege validation logic. The vulnerability is particularly concerning because it operates within a security context where users typically expect strict isolation between different privilege levels, yet the system allows for unauthorized privilege elevation through the call dispatcher interface.
The operational impact of CVE-2018-18766 extends beyond simple privilege escalation, as it fundamentally compromises the security posture of SiteKiosk deployments. Organizations relying on this software for public access terminals face significant risks including unauthorized system modifications, data theft, and potential lateral movement within network environments. The vulnerability aligns with CWE-284, which specifically addresses improper access control, and can be mapped to ATT&CK technique T1068, which covers exploit for privilege escalation. In practical deployment scenarios, this vulnerability has been observed to enable attackers to modify system configurations, install malicious software, and access restricted administrative functions that should only be available to authorized personnel. The affected systems typically include public kiosks, digital signage platforms, and information terminals that require robust security controls to prevent unauthorized access.
Mitigation strategies for CVE-2018-18766 must include immediate deployment of the patched version 9.7.4905 or later, which addresses the privilege validation flaws within the call dispatcher module. Organizations should also implement additional security controls such as network segmentation to isolate SiteKiosk environments, regular security assessments of the call dispatcher functionality, and monitoring for unauthorized privilege escalation attempts. System administrators should review and tighten access controls for the call dispatcher interface, ensuring that only authorized users with proper authentication credentials can access administrative functions. The vulnerability demonstrates the importance of maintaining up-to-date security patches in public access computing environments and highlights the need for comprehensive security testing of all components within kiosk and terminal systems. Additionally, implementing proper logging and monitoring of call dispatcher activities can help detect potential exploitation attempts before they result in successful privilege escalation.