CVE-2023-2318 in r
Summary
by MITRE • 08/19/2023
DOM-based XSS in src/muya/lib/contentState/pasteCtrl.js in MarkText 0.17.1 and before on Windows, Linux and macOS allows arbitrary JavaScript code to run in the context of MarkText main window. This vulnerability can be exploited if a user copies text from a malicious webpage and paste it into MarkText.
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Analysis
by VulDB Data Team • 09/13/2023
This vulnerability represents a critical server-side request forgery flaw in the MarkText markdown editor that affects versions 0.17.1 and earlier across multiple operating systems. The issue manifests as a dom-based cross-site scripting vulnerability within the paste control functionality of the application's content state management system. The vulnerability exists in the file src/muya/lib/contentState/pasteCtrl.js which handles paste operations from external sources into the editor interface. When users copy content from malicious web pages and paste it into MarkText, the application fails to properly sanitize or escape the content before rendering it within the main window context. This allows attackers to inject arbitrary javascript code that executes with the privileges and permissions of the MarkText application itself.
The technical exploitation of this vulnerability leverages the inherent trust model of desktop applications where user input from clipboard operations is not adequately validated or sanitized. The paste control mechanism does not implement proper input sanitization or output encoding when processing clipboard content, creating a direct pathway for malicious script execution. This flaw operates at the application layer where the editor processes user-provided content without sufficient security controls to prevent script injection. The vulnerability's impact is amplified by the fact that it affects all major operating systems including windows linux and macos, making it a widespread concern across desktop environments. The attack vector requires minimal user interaction as simple clipboard operations can trigger the exploit, making it particularly dangerous in targeted attack scenarios.
From a security perspective this vulnerability directly relates to CWE-79 which defines cross-site scripting flaws in web applications and desktop software contexts. The flaw enables attackers to execute malicious code within the application's security boundaries, potentially leading to data exfiltration, privilege escalation, or system compromise. The operational impact extends beyond simple script execution as the malicious code can interact with the application's full feature set including file system access and network communications. This vulnerability aligns with ATT&CK technique T1059.007 which covers scripting languages and T1566 which encompasses social engineering through malicious content. The attack surface is particularly concerning because it relies on user behavior rather than complex exploitation techniques, making it highly effective in phishing or social engineering campaigns where users might unknowingly copy malicious content from compromised websites.
Mitigation strategies should focus on immediate code-level fixes including implementing proper input sanitization and output encoding for all clipboard operations. The paste control functionality must be updated to escape or remove potentially dangerous content before rendering it within the application context. Additionally organizations should consider implementing clipboard monitoring solutions that can detect and block suspicious content patterns. Regular security updates and patches should be prioritized to address this vulnerability, as the flaw exists in multiple platform versions and requires coordinated remediation across all supported operating systems. User education about clipboard security and the dangers of copying content from untrusted sources remains essential in reducing the attack surface. The vulnerability also highlights the need for comprehensive security testing of desktop applications that handle external content, particularly those with rich text editing capabilities that process untrusted input from clipboard operations.