CVE-2022-0776 in reveal.js
Summary
by MITRE • 03/01/2022
Cross-site Scripting (XSS) - DOM in GitHub repository hakimel/reveal.js prior to 4.3.0.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/04/2022
The vulnerability identified as CVE-2022-0776 represents a cross-site scripting flaw within the reveal.js library, specifically affecting versions prior to 4.3.0. This issue resides in the DOM-based XSS category, making it particularly concerning for web applications that rely on this popular presentation framework. The vulnerability stems from insufficient input validation and sanitization mechanisms within the library's DOM manipulation functions, creating an avenue for malicious actors to inject and execute arbitrary JavaScript code within the context of a victim's browser session. The affected repository hakimel/reveal.js serves as a widely-used tool for creating interactive presentations and slideshows, making this vulnerability impactful across numerous web applications and platforms that utilize this library.
The technical implementation of this vulnerability occurs when the library processes user-provided input through DOM-based operations without proper sanitization. Attackers can exploit this by crafting malicious payloads that get executed when the presentation content is rendered, particularly when the library handles URL parameters or dynamic content injection. The flaw operates by bypassing standard input validation checks that would normally occur at the server-side or during initial data processing, instead allowing malicious scripts to be executed during the client-side DOM manipulation phase. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, and more precisely aligns with CWE-116 which deals with improper encoding or escaping of output. The vulnerability's exploitation requires an attacker to convince a user to visit a specially crafted URL or interact with a malicious presentation that contains the XSS payload.
The operational impact of CVE-2022-0776 extends beyond simple script execution, as it can lead to session hijacking, credential theft, and privilege escalation within the affected web applications. When users interact with presentations that contain malicious payloads, their browsers execute the injected scripts, potentially allowing attackers to access sensitive information, modify presentation content, or redirect users to malicious sites. This vulnerability is particularly dangerous in enterprise environments where reveal.js is used for internal presentations, as it could enable attackers to gain access to confidential business information or manipulate critical presentation materials. The attack vector is typically initiated through phishing campaigns or compromised websites that serve malicious presentations, making it difficult to detect and prevent. Organizations relying on this library for their web-based presentations face significant risk, as the vulnerability can be exploited through various means including social engineering tactics that leverage the trust users place in presentation tools.
Mitigation strategies for this vulnerability require immediate remediation through the upgrade to reveal.js version 4.3.0 or later, which includes proper input sanitization and DOM-based XSS protection mechanisms. Organizations should implement comprehensive security scanning processes that include dependency checking to identify affected versions of the library across their web applications. The implementation of Content Security Policy headers can provide additional protection layers by restricting script execution and limiting the impact of potential exploitation attempts. Security teams should also consider implementing input validation at multiple layers including client-side, server-side, and API validation points to create defense-in-depth measures against similar vulnerabilities. Regular security audits and dependency monitoring are crucial to maintaining protection against such vulnerabilities, as demonstrated by the ATT&CK framework's emphasis on maintaining secure software dependencies and preventing exploitation of known vulnerabilities through proper patch management and security controls.