CVE-2022-2342 in outline
Summary
by MITRE • 07/07/2022
Cross-site Scripting (XSS) - Stored in GitHub repository outline/outline prior to v0.64.4.
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Analysis
by VulDB Data Team • 07/20/2022
The vulnerability identified as CVE-2022-2342 represents a stored cross-site scripting flaw within the GitHub repository outline/outline prior to version 0.64.4. This repository hosts a collaborative knowledge management platform that allows users to create and share documents within organizational environments. The stored XSS vulnerability arises from insufficient input validation and output sanitization mechanisms within the application's document handling and rendering components. Attackers can exploit this weakness by injecting malicious scripts into content that gets stored and subsequently executed when other users view the affected documents, creating a persistent threat vector that can compromise user sessions and execute unauthorized actions on behalf of victims.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize user-supplied content before storing and rendering it within the web interface. Specifically, when users create or edit documents containing HTML content, the system does not adequately filter or escape special characters that could be interpreted as executable script code. This flaw manifests in the document editing and preview components where user input flows directly into the DOM without proper sanitization. The vulnerability is classified as CWE-79 - Cross-site Scripting, which is a well-documented weakness in web applications where untrusted data is improperly handled in web pages, allowing attackers to inject malicious client-side scripts. The stored nature of this vulnerability means that the malicious payload persists in the application's database and executes automatically whenever affected pages are loaded, making it particularly dangerous as it can affect multiple users over extended periods.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive information, manipulate document content, and potentially escalate privileges within the application. An attacker could inject scripts that capture user credentials, redirect victims to malicious sites, or modify document content to spread further attacks. The vulnerability affects all users who have access to create or edit documents within the repository, making it a significant risk for organizations relying on this collaborative platform. According to ATT&CK framework, this vulnerability maps to T1566.001 - Phishing, as attackers can craft malicious documents that appear legitimate while containing hidden payloads, and T1059.007 - Command and Scripting Interpreter - PowerShell, since the injected scripts can leverage various scripting languages to execute malicious commands on compromised systems. The stored nature of the vulnerability makes it particularly effective for social engineering campaigns where attackers can create seemingly benign documents that become attack vectors when viewed by other users.
The remediation for CVE-2022-2342 requires implementing comprehensive input validation and output sanitization measures throughout the application's document handling pipeline. Organizations should ensure that all user-supplied content undergoes strict sanitization using libraries designed for HTML content filtering such as DOMPurify or similar security-focused sanitizers. The fix involves updating the application to version 0.64.4 or later, which includes proper escaping and sanitization mechanisms for stored content. Additionally, implementing Content Security Policy headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded. Security measures should also include regular security audits of input handling components, implementing proper output encoding for all dynamic content, and establishing secure coding practices that prevent similar vulnerabilities from occurring in future development cycles. Organizations should conduct thorough penetration testing to validate that the remediation effectively addresses the vulnerability and monitor for any potential exploitation attempts that might have occurred prior to the patch deployment.