CVE-2020-14012 in osTicket
Summary
by MITRE
scp/categories.php in osTicket 1.14.2 allows XSS via a Knowledgebase Category Name or Category Description. The attacker must be an Agent.
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Analysis
by VulDB Data Team • 06/11/2020
The vulnerability CVE-2020-14012 represents a cross-site scripting flaw in the osTicket help desk system version 1.14.2 specifically within the scp/categories.php component. This security weakness affects the knowledgebase category management functionality where both category names and descriptions are susceptible to malicious input injection. The vulnerability requires an attacker to possess agent-level privileges within the system, which significantly narrows the attack surface but does not eliminate the risk entirely. The flaw exists in the server-side processing of user inputs without proper sanitization or output encoding, creating an avenue for persistent XSS attacks that can be exploited by authenticated users with appropriate access levels.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the osTicket administrative interface. When administrators or agents create or modify knowledgebase categories, the system fails to properly sanitize user-provided content before storing or rendering it in web pages. This allows malicious actors with agent permissions to inject malicious scripts into category names or descriptions that will execute in the browsers of other users who view these categories. The vulnerability manifests as a persistent XSS vector because the malicious content is stored server-side and subsequently served to other users without proper HTML escaping or content security policy enforcement. This type of flaw falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness that has been consistently identified as one of the top ten web application security risks.
The operational impact of CVE-2020-14012 extends beyond simple script execution as it can enable attackers to perform various malicious activities including session hijacking, credential theft, and data exfiltration from authenticated users. An attacker with agent privileges could craft malicious category names or descriptions containing JavaScript payloads that would execute when other agents or administrators view the knowledgebase. This could lead to unauthorized access to sensitive customer information, modification of knowledgebase content, or redirection to malicious websites. The attack chain typically involves the attacker creating a category with malicious script content, which then gets executed in the victim's browser context when they navigate to the category page. This vulnerability directly aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, as it leverages the JavaScript execution environment to carry out malicious activities. The impact is particularly concerning in enterprise environments where osTicket systems may contain sensitive customer data and where agent accounts may have elevated privileges within the help desk infrastructure.
Mitigation strategies for CVE-2020-14012 should focus on immediate patching of the affected osTicket version to the latest stable release that contains the security fix. Organizations should also implement additional defensive measures including input sanitization at multiple layers, implementation of Content Security Policy headers, and regular security auditing of administrative interfaces. Access controls should be strictly enforced to minimize the number of users with agent privileges, and regular security training should be provided to administrative staff to recognize potential social engineering attempts that could lead to privilege escalation. Network monitoring should be enhanced to detect anomalous behavior patterns in knowledgebase management activities, and regular penetration testing should be conducted to identify similar vulnerabilities in other components of the osTicket system or related applications. The vulnerability demonstrates the importance of proper input validation and output encoding practices in web applications, aligning with security best practices outlined in OWASP Top Ten and NIST Cybersecurity Framework guidelines.