CVE-2022-24656 in HexoEditor
Summary
by MITRE • 03/21/2022
HexoEditor 1.1.8 is affected by Cross Site Scripting (XSS). By putting a common XSS payload in a markdown file, if opened with the app, will execute several times.
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Analysis
by VulDB Data Team • 03/23/2022
HexoEditor version 1.1.8 contains a critical cross site scripting vulnerability that arises from insufficient input validation and sanitization of markdown content. This vulnerability falls under the CWE-79 category of Cross Site Scripting, specifically representing a reflected XSS flaw where malicious scripts are executed when users open specially crafted markdown files within the application interface. The vulnerability manifests when the application fails to properly escape or sanitize user-supplied input during the rendering process of markdown documents, allowing attackers to inject malicious JavaScript code that executes in the context of the victim's browser session.
The technical exploitation of this vulnerability occurs when an attacker creates a markdown file containing malicious XSS payloads and distributes it to unsuspecting users who then open the file using HexoEditor 1.1.8. The application's markdown rendering engine does not adequately sanitize the input, causing the malicious script to execute multiple times depending on the specific payload structure and the application's parsing behavior. This multi-execution aspect increases the potential impact of the attack vector, as it allows for more complex malicious operations that could persist across multiple rendering cycles or trigger additional malicious behaviors.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform session hijacking, steal sensitive information, redirect users to malicious websites, or even execute arbitrary code within the victim's browser environment. This vulnerability is particularly concerning in environments where users frequently exchange markdown documents or collaborate on content, as it creates a persistent attack surface that could be exploited by adversaries to compromise multiple users within an organization. The vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments, where markdown files serve as the delivery mechanism for malicious payloads.
Organizations and users should immediately implement mitigations including updating to a patched version of HexoEditor, implementing strict input validation for all markdown content, and establishing security awareness training to prevent users from opening untrusted markdown files. Additionally, network-based protections such as web application firewalls and content filtering systems should be configured to detect and block known XSS payload patterns. The vulnerability demonstrates the importance of proper input sanitization in applications that process user-generated content, particularly in document editing applications where the threat of malicious content injection is high. Security teams should also consider implementing automated scanning tools to detect and prevent the distribution of potentially malicious markdown files within their networks, as this vulnerability could be exploited in targeted attacks against specific user groups or organizations.