CVE-2022-4271 in osticket
Summary
by MITRE • 12/02/2022
Cross-site Scripting (XSS) - Reflected in GitHub repository osticket/osticket prior to 1.16.4.
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Analysis
by VulDB Data Team • 12/25/2022
The vulnerability identified as CVE-2022-4271 represents a reflected cross-site scripting flaw within the osticket/osticket repository prior to version 1.16.4. This issue manifests in the web application's handling of user input parameters that are subsequently reflected back to users without proper sanitization or encoding mechanisms. The vulnerability exists within the ticketing system's user interface where malicious actors can inject malicious scripts through crafted input fields or URL parameters that are not adequately validated or escaped before being rendered in the browser context.
The technical implementation of this reflected XSS vulnerability occurs when the application processes user-supplied data through HTTP request parameters and directly incorporates this data into HTML responses without appropriate output encoding or sanitization. This allows attackers to execute arbitrary JavaScript code within the context of other users' browsers, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The flaw specifically affects the application's handling of input fields where user data is echoed back to the browser without proper security measures such as HTML entity encoding or Content Security Policy enforcement.
Operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the capability to establish persistent malicious sessions within the ticketing system. Attackers can craft malicious URLs that, when clicked by authenticated users, execute scripts that steal session cookies, modify user interface elements, or redirect users to phishing sites. The reflected nature of the vulnerability means that exploitation requires user interaction with a malicious link, but once triggered, the attack can persist until the user session ends or the browser is closed. This vulnerability particularly affects organizations relying on osticket for customer support where users may inadvertently click malicious links or where attackers can leverage social engineering to deliver the payload.
Mitigation strategies for this vulnerability involve implementing comprehensive input validation and output encoding mechanisms throughout the application. The primary fix requires updating the osticket application to version 1.16.4 or later where the XSS vulnerability has been addressed through proper input sanitization and output encoding. Organizations should also implement Content Security Policy headers to limit script execution sources and employ proper HTML entity encoding for all user-supplied data that is reflected back to the browser. Additional defensive measures include implementing proper parameter validation, utilizing secure coding practices that prevent direct data injection into HTML contexts, and conducting regular security assessments of web applications to identify similar vulnerabilities. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and represents a common attack vector that maps to ATT&CK technique T1566.001 for initial access through spearphishing attachments or links, and T1059.007 for command and control through script injection.
The remediation process requires comprehensive testing to ensure that all input parameters are properly sanitized and that output encoding is consistently applied across all user-facing interfaces. Security teams should also implement automated scanning tools to identify similar vulnerabilities in other web applications within their environment and establish secure coding guidelines that prevent such flaws from occurring in future development cycles. Regular patch management processes should be enforced to maintain current versions of all web applications and frameworks to protect against known vulnerabilities. Organizations using osticket should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts of this and similar vulnerabilities.