CVE-2013-4088 in OTRS
Summary
by MITRE
Kernel/Modules/AgentTicketWatcher.pm in Open Ticket Request System (OTRS) 3.0.x before 3.0.21, 3.1.x before 3.1.17, and 3.2.x before 3.2.8 does not properly restrict tickets, which allows remote attackers with a valid agent login to read restricted tickets via a crafted URL involving the ticket split mechanism.
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Analysis
by VulDB Data Team • 06/11/2024
The vulnerability identified as CVE-2013-4088 represents a critical access control flaw within the Open Ticket Request System (OTRS) platform, specifically affecting versions prior to the mentioned security patches. This issue resides in the AgentTicketWatcher.pm module which governs how agent users interact with ticket data within the system. The flaw manifests when legitimate agent users attempt to access tickets through a specially crafted URL that exploits the ticket split mechanism functionality. This vulnerability directly undermines the principle of least privilege and proper access controls that are fundamental to secure information management systems. The affected versions include major release branches 3.0.x through 3.0.20, 3.1.x through 3.1.16, and 3.2.x through 3.2.7, indicating a widespread impact across multiple stable releases of this popular customer service management platform. The vulnerability is classified under CWE-285 which specifically addresses improper authorization issues, making it a clear violation of access control mechanisms that should protect sensitive data within enterprise systems.
The technical exploitation of this vulnerability occurs through the manipulation of URL parameters that control ticket access within the ticket split functionality. When an authenticated agent user crafts a specific URL that leverages the ticket splitting mechanism, they can bypass the normal access restrictions that should prevent them from viewing tickets they do not have proper authorization to access. This flaw essentially allows privilege escalation within the context of legitimate agent accounts, transforming normal agent access into unauthorized ticket reading capabilities. The attack vector is particularly concerning because it requires only a valid agent login, meaning that an attacker who has already compromised an agent account can escalate their privileges to access restricted information without needing additional credentials or elevated privileges. The vulnerability operates at the application level within the OTRS kernel, specifically targeting the module responsible for managing agent ticket access and permissions, making it a direct threat to the integrity and confidentiality of the ticketing system's data access controls.
The operational impact of CVE-2013-4088 extends beyond simple unauthorized data access, potentially exposing sensitive customer information, internal communications, and business-critical data that should remain restricted to authorized personnel only. Organizations using affected OTRS versions face significant risk of data breaches and compliance violations, particularly in regulated environments where access to customer information must be strictly controlled. The vulnerability's impact is amplified by the fact that it affects a core functionality of the ticketing system, meaning that any organization relying on OTRS for customer support, incident management, or business process automation could experience unauthorized access to confidential information. This type of vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation, as attackers can leverage legitimate agent credentials to access restricted data. The attack requires minimal technical skill and can be executed remotely, making it particularly dangerous for organizations with distributed teams or those that do not maintain strict network segmentation around their ticketing systems.
Organizations should immediately implement the security patches released by OTRS for versions 3.0.21, 3.1.17, and 3.2.8 to remediate this vulnerability. System administrators should conduct comprehensive audits of their agent user accounts to identify any potential unauthorized access that may have occurred before patching. The mitigation strategy should include monitoring access logs for suspicious URL patterns and implementing network-level controls to restrict access to the ticketing system. Additionally, organizations should consider implementing role-based access controls and regular security assessments to identify similar vulnerabilities in their ticketing infrastructure. The vulnerability demonstrates the critical importance of proper input validation and access control enforcement within web applications, particularly in systems that handle sensitive customer data. This flaw serves as a reminder of the necessity for robust security testing and the importance of maintaining up-to-date security patches across all enterprise applications. Organizations should also consider implementing automated vulnerability scanning tools to detect similar access control issues in other applications within their environment, as the underlying principles of this vulnerability are common across many web-based systems and can be exploited in similar fashion in other platforms.