Objective: Compromise Application via FSCalendar Vulnerabilities
Goal: Compromise Application via FSCalendar Vulnerabilities ├── 1. Manipulate Calendar Display/Data [HIGH RISK] │ ├── 1.1 Inject Malicious Input into Calendar Data Sources [HIGH RISK] │ │ ├── 1.1.1 Exploit Unsanitized Event Titles/Descriptions [CRITICAL] │ │ │ ├── 1.1.1.1 Cross-Site Scripting (XSS) via Event Data [HIGH RISK] [CRITICAL] │ │ │ │ └── Mitigation: ... │ │ ├── 1.1.2 Exploit Unsanitized Custom Cell Content [HIGH RISK] │ │ │ ├── 1.1.2.1 XSS via Custom Cell Renderers [HIGH RISK] [CRITICAL] │ │ │ │ └── Mitigation: ... │ │ └── 1.1.4 Exploit Unsanitized URL in Event │ │ └── 1.1.4.2 XSS via Event URL (if rendered as a link) [HIGH RISK] │ │ └── Mitigation: ... │ └── 1.2 Tamper with Calendar Configuration/Appearance │ └── 1.2.2 Bypass Access Controls to Modify Other Users' Calendars [HIGH RISK] │ └── 1.2.2.1 Insufficient Authorization Checks on Calendar Data Updates [HIGH RISK] [CRITICAL] │ └── Mitigation: ...
Attack Tree Path: 1. Manipulate Calendar Display/Data [HIGH RISK]
This is the primary attack path, focusing on altering the calendar's appearance or data to the attacker's advantage.
Attack Tree Path: 1.1 Inject Malicious Input into Calendar Data Sources [HIGH RISK]
This sub-path targets vulnerabilities arising from insufficient input validation and sanitization.
Attack Tree Path: 1.1.1 Exploit Unsanitized Event Titles/Descriptions [CRITICAL]
Attackers inject malicious code into event details, which are then rendered by the calendar.
Attack Tree Path: 1.1.1.1 Cross-Site Scripting (XSS) via Event Data [HIGH RISK] [CRITICAL]
Description: The attacker injects malicious JavaScript code into event titles or descriptions. When the calendar renders these events, the injected script executes in the context of other users' browsers. Likelihood: High (if input is not sanitized) Impact: High (can lead to account takeover, data theft, session hijacking, defacement) Effort: Low Skill Level: Novice/Intermediate Detection Difficulty: Medium Mitigation: * Implement rigorous input sanitization using a well-vetted HTML sanitization library. Remove or encode all potentially dangerous characters and tags. * Use output encoding (e.g., HTML entity encoding) to ensure that any remaining special characters are treated as text, not code. * Employ a Content Security Policy (CSP) to restrict the sources from which scripts can be loaded.
Attack Tree Path: 1.1.2 Exploit Unsanitized Custom Cell Content [HIGH RISK]
If the application allows users to customize the appearance of calendar cells, attackers can inject malicious code into these customizations.
Attack Tree Path: 1.1.2.1 XSS via Custom Cell Renderers [HIGH RISK] [CRITICAL]
Description: Similar to 1.1.1.1, but the injection point is within the custom cell rendering logic. If the application uses custom cell renderers (delegates or data sources) and doesn't sanitize user-provided data used within them, attackers can inject malicious scripts. Likelihood: Medium (depends on whether custom cell rendering is used and how it's implemented) Impact: High (same as 1.1.1.1) Effort: Low Skill Level: Novice/Intermediate Detection Difficulty: Medium Mitigation: * Rigorously sanitize all user-provided data used within custom cell renderers. This includes any data used to generate HTML, CSS, or JavaScript. * Apply the same sanitization and encoding techniques as for event data (1.1.1.1). * Consider limiting the customization options available to users to reduce the attack surface.
Attack Tree Path: 1.1.4 Exploit Unsanitized URL in Event
Attackers inject malicious URLs into event data.
Attack Tree Path: 1.1.4.2 XSS via Event URL (if rendered as a link) [HIGH RISK]
Description: If the calendar renders URLs from event data as clickable links without proper sanitization, an attacker can inject a javascript: URL or other malicious URL schemes that execute code when clicked.
Likelihood: Medium (if URLs are rendered as links without sanitization)
Impact: High (same as 1.1.1.1)
Effort: Low
Skill Level: Novice/Intermediate
Detection Difficulty: Medium
Mitigation:
* Sanitize and encode URLs before rendering them as HTML links. Use a URL sanitization library to remove or encode dangerous characters and schemes.
* Validate URLs against a whitelist of allowed schemes (e.g., http:, https:) and, if possible, a whitelist of allowed domains.
* Consider using a rel="noopener noreferrer" attribute on links to prevent the opened page from accessing the opener window.
Attack Tree Path: 1.2 Tamper with Calendar Configuration/Appearance
This path focuses on manipulating the calendar's settings or appearance, potentially to mislead users or disrupt service.
Attackers attempt to gain unauthorized access to modify other users' calendar data.
Attack Tree Path: 1.2.2.1 Insufficient Authorization Checks on Calendar Data Updates [HIGH RISK] [CRITICAL]
Description: The application lacks proper authorization checks, allowing a user to modify calendar data belonging to other users. This could involve changing event details, deleting events, or adding unauthorized events. Likelihood: Medium (if authorization is not properly implemented) Impact: High (data breach, data modification, data loss, privacy violation) Effort: Medium Skill Level: Intermediate Detection Difficulty: Medium/Hard Mitigation: * Implement robust server-side authorization checks on every API endpoint that interacts with calendar data. * Verify that the currently authenticated user has the necessary permissions to perform the requested action (create, read, update, delete) on the specific calendar data. * Use a consistent and well-defined authorization model (e.g., Role-Based Access Control - RBAC). * Thoroughly test all authorization logic, including edge cases and boundary conditions. Use automated testing and manual penetration testing. * Log all authorization failures for auditing and monitoring.