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Mitigation Strategies Analysis for impress/impress.js

Mitigation Strategy: Strict Content Security Policy (CSP) for Impress.js Presentations

  • Description:

    • Step 1: Define a CSP policy tailored for impress.js. Create a CSP policy that is specifically designed to secure impress.js presentations. This means focusing on directives that control script execution and resource loading within the context of a client-side presentation framework.
    • Step 2: Restrict script-src for impress.js. Set the script-src directive to 'self' to ensure that only scripts from your application's origin are allowed to execute. This is crucial for preventing XSS attacks that might target the dynamic nature of impress.js presentations. Avoid 'unsafe-inline' and 'unsafe-eval' which are particularly risky in client-side frameworks.
    • Step 3: Control resource loading for impress.js assets. Use directives like style-src 'self', img-src 'self', and font-src 'self' to limit the sources from which impress.js and presentation assets (styles, images, fonts) can be loaded. This reduces the risk of loading malicious resources that could be injected into the presentation.
    • Step 4: Implement CSP for pages serving impress.js. Configure your web server to send the Content-Security-Policy HTTP header with your defined policy for all pages that host impress.js presentations. This ensures that the CSP is enforced whenever a user views the presentation.
    • Step 5: Test CSP with impress.js functionality. Thoroughly test your CSP policy to ensure it doesn't interfere with the intended functionality of your impress.js presentation. Use browser developer tools to identify and resolve any CSP violations while ensuring the presentation works correctly.

  • List of Threats Mitigated:

    • Cross-Site Scripting (XSS) targeting impress.js - Severity: High
    • Malicious Script Injection into impress.js presentation - Severity: High
    • Code Injection within impress.js context - Severity: High
    • Clickjacking of impress.js presentations - Severity: Medium

  • Impact:

    • Cross-Site Scripting (XSS): Significantly reduces the risk of XSS attacks specifically targeting impress.js presentations.
    • Malicious Script Injection: Significantly reduces the risk of injecting and executing malicious scripts within the impress.js presentation context.
    • Code Injection: Significantly reduces the risk of code injection vulnerabilities within the client-side presentation logic.
    • Clickjacking: Moderately reduces the risk of clickjacking attacks targeting the interactive elements of impress.js presentations (using frame-ancestors).

  • Currently Implemented: Not Implemented Yet

  • Missing Implementation: Web server configuration to send Content-Security-Policy header specifically for pages displaying impress.js presentations. Definition of a CSP policy tailored to impress.js requirements.

Mitigation Strategy: Output Encoding and Sanitization for Dynamic Content in Impress.js

  • Description:

    • Step 1: Identify dynamic content within impress.js steps. Locate all parts of your impress.js presentation where content is dynamically generated or comes from external sources (user input, APIs, databases) and is inserted into impress.js steps or elements.
    • Step 2: Encode dynamic content before impress.js rendering. Ensure that all dynamic content is properly encoded before it is rendered by impress.js. This means encoding HTML entities, JavaScript strings, or CSS contexts as needed, depending on where the dynamic content is being inserted within the impress.js presentation structure.
    • Step 3: Sanitize HTML if allowing user-provided HTML in impress.js. If you allow users to provide any HTML content that is then displayed within impress.js steps, use a robust HTML sanitization library to remove potentially malicious HTML tags and attributes before impress.js processes it. Whitelist safe HTML tags and attributes.
    • Step 4: Apply encoding/sanitization consistently throughout impress.js presentation logic. Implement encoding and sanitization at every point where dynamic content is integrated into the impress.js presentation, whether it's during initial presentation setup or during dynamic updates.

  • List of Threats Mitigated:

    • Cross-Site Scripting (XSS) in impress.js presentations - Severity: High
    • HTML Injection within impress.js steps - Severity: High
    • Data Injection vulnerabilities in impress.js content - Severity: Medium

  • Impact:

    • Cross-Site Scripting (XSS): Significantly reduces the risk of XSS vulnerabilities arising from dynamic content within impress.js presentations.
    • HTML Injection: Significantly reduces the risk of unintended or malicious HTML structures being injected into impress.js steps.
    • Data Injection: Moderately reduces the risk of data injection attacks by ensuring data is treated as data and not executable code within the presentation.

  • Currently Implemented: Not Implemented Yet

  • Missing Implementation: Review of impress.js presentation code for dynamic content insertion points. Implementation of encoding/sanitization logic specifically for these points, ensuring it's applied before impress.js renders the content.

Mitigation Strategy: Minimize innerHTML Usage in Impress.js Step Creation and Updates

  • Description:

    • Step 1: Audit impress.js JavaScript for innerHTML. Review the JavaScript code responsible for creating and updating impress.js presentation steps and content. Identify instances where innerHTML or similar dynamic HTML insertion methods are used.
    • Step 2: Refactor impress.js step construction using DOM methods. Rewrite the code to use safer DOM manipulation methods like document.createElement(), document.createTextNode(), appendChild(), and setAttribute() to construct impress.js steps and their content instead of relying on innerHTML.
    • Step 3: Create impress.js step helper functions using DOM methods. Develop helper functions that encapsulate the creation of common impress.js step structures using DOM manipulation methods. This promotes code reusability and reduces the likelihood of introducing vulnerabilities through direct innerHTML usage.
    • Step 4: Sanitize rigorously if innerHTML is absolutely necessary in impress.js. If there are specific scenarios where innerHTML is deemed unavoidable for performance or complexity within impress.js step manipulation, ensure that the input to innerHTML is rigorously sanitized using a trusted HTML sanitization library before it's used in the impress.js context.

  • List of Threats Mitigated:

    • Cross-Site Scripting (XSS) in impress.js step creation - Severity: High
    • HTML Injection vulnerabilities during impress.js step manipulation - Severity: High

  • Impact:

    • Cross-Site Scripting (XSS): Significantly reduces the risk of XSS vulnerabilities introduced through innerHTML when building impress.js presentations.
    • HTML Injection: Significantly reduces the risk of HTML injection attacks targeting the structure and content of impress.js steps.

  • Currently Implemented: Not Implemented Yet

  • Missing Implementation: Code review of JavaScript files related to impress.js step generation and updates. Refactoring of code to minimize or eliminate innerHTML usage in impress.js step manipulation.

Mitigation Strategy: Implement frame-ancestors CSP Directive for Impress.js Pages

  • Description:

    • Step 1: Include frame-ancestors in CSP for impress.js pages. When defining your Content Security Policy for pages hosting impress.js presentations, specifically include the frame-ancestors directive.
    • Step 2: Set frame-ancestors 'self' for impress.js. Configure frame-ancestors 'self' in your CSP to restrict framing of impress.js presentation pages to only the same origin. This is a strong default setting to prevent clickjacking.
    • Step 3: Whitelist trusted domains in frame-ancestors if needed for impress.js embedding. If you legitimately need to embed your impress.js presentation on specific trusted external domains, add those domains to the frame-ancestors whitelist (e.g., frame-ancestors 'self' https://trusted-domain.com). Use HTTPS for whitelisted domains.
    • Step 4: Deploy and test CSP with frame-ancestors for impress.js. Implement the CSP policy with the frame-ancestors directive on your web server for pages serving impress.js presentations. Test to ensure it prevents unwanted framing and allows legitimate embedding scenarios if configured.

  • List of Threats Mitigated:

    • Clickjacking attacks targeting impress.js presentations - Severity: Medium

  • Impact:

    • Clickjacking: Moderately to Significantly reduces the risk of clickjacking attacks specifically targeting impress.js presentations by controlling where the presentation can be framed.

  • Currently Implemented: Not Implemented Yet

  • Missing Implementation: Update the Content Security Policy to include the frame-ancestors directive for pages serving impress.js. Web server configuration to deploy the updated CSP.

Mitigation Strategy: Review Impress.js Presentation Content for Sensitive Information

  • Description:

    • Step 1: Establish a content review process for impress.js presentations. Implement a review process specifically for the content of impress.js presentations before they are deployed. This process should focus on identifying and removing any sensitive or confidential information that should not be publicly accessible in a client-side presentation.
    • Step 2: Train reviewers on sensitive data in impress.js context. Train content creators and reviewers to be aware of what constitutes sensitive information in the context of impress.js presentations. This includes API keys, internal data, personal information, proprietary details, or anything that could be misused if exposed in a client-side presentation.
    • Step 3: Manually review impress.js presentation files. Conduct manual reviews of all impress.js presentation files (HTML, JavaScript, CSS, text content within steps) to check for accidental inclusion of sensitive data.
    • Step 4: Use automated scanning for sensitive data in impress.js content (optional). Consider using automated tools to scan impress.js presentation files for patterns that might indicate sensitive data (e.g., keywords, regular expressions for sensitive data formats). These tools can assist manual review but should not replace it entirely.

  • List of Threats Mitigated:

    • Information Disclosure through impress.js presentations - Severity: Medium
    • Data Leakage via impress.js presentation content - Severity: Medium
    • Privacy Violation due to exposed data in impress.js - Severity: Medium

  • Impact:

    • Information Disclosure: Moderately reduces the risk of unintentionally disclosing sensitive information through impress.js presentations.
    • Data Leakage: Moderately reduces the risk of confidential data leaking through publicly accessible impress.js presentation content.
    • Privacy Violation: Moderately reduces the risk of accidentally exposing personal information within impress.js presentations.

  • Currently Implemented: Not Implemented Yet

  • Missing Implementation: Formalize a content review process for impress.js presentations. Provide training to content reviewers on identifying sensitive data in this context. Implement manual review as a standard step before deploying impress.js presentations.