Horizon Alert
Summary of the vulnerability and why it matters
An issue in the Diagram's export module allows an unauthenticated user to read local files from the server. This happens because the software does not properly clean up HTML input, potentially exposing sensitive information within generated PDF reports.
- Sensitive files could be exposed.
- Any user can potentially trigger this.
- This affects how data is shared securely.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can exploit this vulnerability by crafting a malicious HTML payload. This payload would manipulate the export module to include sensitive local files from the server, which are then embedded into the generated PDF. This allows an attacker to exfiltrate server-side data without any prior authentication.
- No authentication required.
- Target the export function.
- Server-side file access needed.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows unauthenticated users to access local files via crafted HTML payloads that are then rendered into a PDF. While the export module might not be universally exposed, web applications often present such functionalities to external users, increasing the potential for exploitation. The lack of HTML sanitization is a straightforward technical flaw.
- Unauthenticated remote exploitation is possible.
- No public exploit is yet observed.
- The vulnerability is recent.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize blocking network access to DHTMLX Diagram's export module and immediately investigate applications using this component. The Path Traversal vulnerability in the `src` attribute allows unauthenticated users to access local server files, which is a critical risk.
- Update Diagram to version 1.1.1.
- Block network access to vulnerable services.
- Monitor for unusual file access patterns.
