CVE-2014-5011

What it actually does

The flaw in DOMPDF before version 0.6.2 permits unauthorized retrieval of sensitive data during PDF document generation by exposing internal resources or files.

Why it matters to the business

Organizations using affected DOMPDF versions risk exposure of confidential documents or configuration data, potentially leading to regulatory penalties or loss of customer trust; the issue has remained unpatched in many deployments for years with no active exploitation campaigns noted.

How an attack unfolds

An attacker sends crafted input to a web application using vulnerable DOMPDF that triggers the library to process and return restricted information in the generated output, without requiring authentication beyond the application's normal usage.

How to fix it

Upgrade the dompdf library to version 0.6.2 or newer in all applications; if immediate upgrade is not feasible, restrict or disable PDF generation features that accept untrusted input.

How to confirm the fix worked

Inspect the installed dompdf version in composer.json, package manifests, or vendor directories and confirm it is at least 0.6.2; test PDF generation endpoints with known sensitive paths to verify they no longer leak data.

Typical attack path

1. Identify a web endpoint that invokes DOMPDF for PDF rendering
2. Submit specially formed content or options designed to leak files or data
3. Receive the generated PDF containing the disclosed information
4. Extract and exfiltrate the sensitive content

How to detect it

Review application logs for unexpected PDF generation requests, unusual file paths referenced during rendering, or outbound transfers of generated documents containing sensitive content.

What your security team should do

• Prioritize inventory of all applications using dompdf and schedule upgrades
• Implement input validation and output filtering around PDF generation until patched
• Monitor dependency scanners for future reports on this component