CVE-2022-3223 in drawio
Summary
by MITRE • 09/16/2022
Cross-site Scripting (XSS) - Stored in GitHub repository jgraph/drawio prior to 20.3.1.
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Analysis
by VulDB Data Team • 10/19/2022
The vulnerability identified as CVE-2022-3223 represents a stored cross-site scripting flaw within the jgraph/drawio repository, a widely used diagramming application that allows users to create and share various types of diagrams through web interfaces. This vulnerability specifically affects versions prior to 20.3.1 and enables malicious actors to inject persistent malicious scripts into the application's data storage, which then executes whenever other users access the affected content. The issue stems from inadequate input validation and output encoding mechanisms within the application's processing pipeline, creating an environment where user-supplied data can be improperly handled and subsequently rendered in web contexts without proper sanitization.
The technical exploitation of this stored XSS vulnerability occurs when an attacker submits malicious script code through the application's input mechanisms, which are then stored in the backend database or file system. When other users view the affected diagrams or content, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability manifests because the application fails to properly sanitize user inputs before storing them and subsequently rendering them in HTML contexts. This weakness aligns with CWE-79, which describes improper neutralization of input during web page generation, and represents a classic stored XSS attack vector where the malicious payload persists in the application's data store rather than being reflected in a single request.
The operational impact of CVE-2022-3223 extends beyond simple script execution, as it can enable sophisticated attacks that compromise user sessions and data integrity within the drawio environment. Attackers could leverage this vulnerability to steal user authentication tokens, access sensitive diagrams, or manipulate the application's functionality to redirect users to phishing sites. The stored nature of the vulnerability means that the malicious code remains active until the affected content is removed or the application is updated, creating a persistent threat that can affect multiple users over extended periods. Organizations relying on drawio for collaborative diagramming and documentation may face significant security risks, particularly in enterprise environments where diagram content often contains sensitive business information, architectural details, or confidential project data.
Mitigation strategies for CVE-2022-3223 primarily focus on updating to the patched version 20.3.1 or later, which implements proper input sanitization and output encoding mechanisms to prevent malicious scripts from being stored and executed. Security teams should also implement additional defensive measures including web application firewalls that can detect and block suspicious script patterns, regular security scanning of stored content, and user education regarding the dangers of opening diagrams from untrusted sources. The remediation process should include comprehensive testing to ensure that all input validation mechanisms are properly implemented and that output encoding is consistently applied across all user-generated content rendering contexts. Organizations should also consider implementing content security policies that limit script execution capabilities within the application environment, as recommended by the ATT&CK framework's web application attack patterns, which emphasize the importance of preventing malicious script injection in web-based collaborative platforms.