CVE-2017-9324 in Open Ticket Request System
Summary
by MITRE
In Open Ticket Request System (OTRS) 3.3.x through 3.3.16, 4.x through 4.0.23, and 5.x through 5.0.19, an attacker with agent permission is capable of opening a specific URL in a browser to gain administrative privileges / full access. Afterward, all system settings can be read and changed. The URLs in question contain index.pl?Action=Installer with ;Subaction=Intro or ;Subaction=Start or ;Subaction=System appended at the end.
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Analysis
by VulDB Data Team • 08/19/2024
The vulnerability identified as CVE-2017-9324 represents a critical privilege escalation flaw within the Open Ticket Request System OTRS platform, affecting versions across multiple release lines including 3.3.x through 3.3.16, 4.x through 4.0.23, and 5.x through 5.0.19. This weakness stems from insufficient access controls and improper authentication checks within the system's installer module, creating a pathway for malicious actors with minimal agent-level permissions to escalate their privileges to full administrative access. The flaw specifically manifests through the manipulation of URL parameters that direct users to installer actions, effectively bypassing the normal security boundaries that should prevent unauthorized access to system configuration and management functions.
The technical implementation of this vulnerability exploits the lack of proper authorization validation within the OTRS installer component. When an authenticated agent accesses specific URLs containing index.pl?Action=Installer with appended Subaction parameters such as Intro, Start, or System, the system fails to verify whether the requesting user possesses the necessary administrative privileges to execute these installer functions. This represents a classic case of inadequate input validation and access control enforcement, where the system's permission model is bypassed through predictable URL manipulation. The vulnerability aligns with CWE-285, which addresses insufficient authorization issues, and demonstrates how weak access control mechanisms can enable privilege escalation attacks.
The operational impact of this vulnerability is severe and far-reaching, as it allows an attacker with only basic agent permissions to completely compromise the system's integrity and confidentiality. Once the privilege escalation is achieved, the attacker gains unrestricted access to all system settings, configuration data, user accounts, and sensitive business information stored within the OTRS environment. This includes the ability to modify system parameters, access confidential customer data, manipulate ticket workflows, and potentially establish backdoors or persistent access points. The vulnerability essentially transforms a low-privilege agent account into a full administrative backdoor, making it particularly dangerous for organizations that rely on OTRS for critical customer service operations and data management.
Organizations affected by this vulnerability should implement immediate mitigations including applying the vendor-provided security patches, disabling access to installer URLs for non-administrative users, and implementing network segmentation to limit access to the OTRS system. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the T1068 - Exploitation for Privilege Escalation tactic. Security administrators should also consider implementing web application firewalls to block access to installer endpoints and conduct comprehensive access control reviews to ensure proper user permission assignments. Additionally, regular security audits should verify that no unauthorized access paths exist within the application's URL structure, and that all authentication mechanisms properly enforce the principle of least privilege. Organizations should also review their incident response procedures to detect and respond to potential exploitation attempts of this type of vulnerability, as it may be used as an initial access vector for more sophisticated attacks.