CVE-2022-28101 in Turtle Note
Summary
by MITRE • 04/28/2022
Turtlapp Turtle Note v0.7.2.6 does not filter the tag during markdown parsing, allowing attackers to execute HTML injection.
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Analysis
by VulDB Data Team • 04/30/2022
The vulnerability identified as CVE-2022-28101 affects Turtlapp Turtle Note version 0.7.2.6, a note-taking application that processes markdown content. This flaw represents a critical security issue that stems from inadequate input validation during markdown parsing operations. The application fails to properly sanitize or filter user-provided tag data before rendering it within markdown contexts, creating an avenue for malicious actors to inject arbitrary HTML content. This type of vulnerability falls under the broader category of cross-site scripting attacks and specifically aligns with CWE-79 which addresses cross-site scripting flaws in web applications and note-taking systems. The vulnerability demonstrates a fundamental weakness in the application's security architecture where user input is not adequately sanitized before being processed and displayed.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious tag content that contains HTML or JavaScript code within the markdown parsing pipeline. During the rendering process, the application does not properly escape or filter the tag data, allowing the injected HTML to be executed within the user's browser context. This injection can occur through various means including but not limited to script tags, event handlers, or other malicious HTML elements that can trigger unintended behavior. The vulnerability is particularly dangerous because it leverages the markdown parsing functionality which is typically considered a safe operation, making it more difficult for users and security systems to detect the malicious activity. The attack vector demonstrates characteristics consistent with ATT&CK technique T1566 which involves phishing and social engineering through malicious content injection.
The operational impact of this vulnerability extends beyond simple data corruption or display issues. An attacker could potentially execute malicious scripts that steal user credentials, session cookies, or other sensitive information from users interacting with the compromised application. The injected HTML could also be used to redirect users to malicious websites, perform unauthorized actions on behalf of the user, or even deliver additional malware payloads. Given that note-taking applications often contain sensitive personal or corporate information, the potential for data exfiltration or unauthorized access is significant. The vulnerability affects all users of the affected version regardless of their security awareness level, as the injection occurs during normal application usage when processing markdown content with tags.
Mitigation strategies for this vulnerability should focus on implementing proper input sanitization and output encoding mechanisms within the markdown parsing pipeline. The application should employ strict validation of tag content to ensure that any HTML or script elements are properly escaped or removed before rendering. Security measures should include implementing Content Security Policy headers to limit the execution of inline scripts and other potentially dangerous content. Additionally, the application should adopt a principle of least privilege when processing user-generated content, ensuring that all input is validated against a strict whitelist of acceptable characters and formats. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other parts of the application's codebase. Organizations using this application should immediately update to the latest version once available, as this vulnerability represents a clear security risk that could be exploited by threat actors without significant technical expertise. The remediation approach should also include user education about the risks of processing untrusted content and the importance of keeping software up to date with the latest security patches.