CVE-2019-25467: Verypdf docPrint Pro Buffer Overflow

CVE-2019-25467 Overview

CVE-2019-25467 is a structured exception handling (SEH) buffer overflow vulnerability affecting Verypdf docPrint Pro 8.0. This vulnerability allows local attackers to execute arbitrary code by supplying an oversized alphanumeric encoded payload in the User Password or Master Password fields during PDF encryption operations. The vulnerability exists due to improper boundary checking when processing password input, enabling attackers to craft malicious payloads with encoded shellcode and SEH chain manipulation to bypass security protections.

Critical Impact

Local attackers can achieve arbitrary code execution by exploiting improper input validation in the password fields, potentially leading to full system compromise on affected Windows systems running Verypdf docPrint Pro 8.0.

Affected Products

• Verypdf docPrint Pro 8.0

Discovery Timeline

• 2026-03-11 - CVE CVE-2019-25467 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2019-25467

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-Bounds Write), a memory corruption flaw that occurs when the application writes data past the allocated buffer boundary. In the case of Verypdf docPrint Pro 8.0, the User Password and Master Password input fields lack proper bounds checking, allowing an attacker to submit an oversized payload that corrupts adjacent memory structures.

The attack exploits the Windows Structured Exception Handler (SEH) mechanism. When the buffer overflow occurs, it overwrites the SEH chain stored on the stack. By carefully crafting the overflow payload with specific SEH pointers and alphanumeric encoded shellcode, an attacker can redirect program execution when an exception is triggered, ultimately achieving arbitrary code execution within the context of the application.

The local attack vector requires the attacker to have access to the target system where docPrint Pro is installed, but does not require any special privileges or user interaction to exploit once access is obtained.

Root Cause

The root cause of this vulnerability is improper input validation in the password field processing routines of Verypdf docPrint Pro 8.0. The application fails to verify that user-supplied password strings fall within expected length limits before copying them to fixed-size stack buffers. This oversight allows oversized input to overflow the buffer and corrupt the SEH chain, providing attackers with a reliable exploitation vector.

Attack Vector

The attack is executed locally by an attacker who has access to the vulnerable system. The exploitation process involves:

1. Launching Verypdf docPrint Pro 8.0 and navigating to the PDF encryption functionality
2. Entering a specially crafted oversized payload in either the User Password or Master Password field
3. The payload contains alphanumeric encoded shellcode with SEH chain pointers designed to redirect execution
4. When the application processes the malformed password input, the buffer overflow corrupts the SEH chain
5. An exception is triggered (either naturally or forced), causing Windows to traverse the corrupted SEH chain
6. Execution is redirected to the attacker's shellcode, achieving arbitrary code execution

Proof-of-concept exploits have demonstrated successful execution of MessageBox payloads, confirming the exploitability of this vulnerability. Technical details are available in the Exploit-DB #47394 entry.

Detection Methods for CVE-2019-25467

Indicators of Compromise

• Presence of Verypdf docPrint Pro version 8.0 installed on Windows systems
• Crash dumps or application errors related to docprint processes with access violation exceptions
• Suspicious SEH chain corruption patterns in memory dumps
• Unusual process behavior following PDF encryption operations

Detection Strategies

• Monitor for application crashes in docPrint Pro processes that may indicate exploitation attempts
• Deploy endpoint detection solutions to identify SEH-based exploitation techniques
• Implement application whitelisting to prevent unauthorized code execution
• Enable Windows Event Logging for application crashes and analyze for patterns consistent with buffer overflow attacks

Monitoring Recommendations

• Configure endpoint detection and response (EDR) solutions to alert on memory corruption patterns
• Monitor process execution chains for anomalous child processes spawned from docPrint Pro
• Review application event logs for repeated crashes in the PDF encryption workflow
• Implement file integrity monitoring on critical system files that may be modified post-exploitation

How to Mitigate CVE-2019-25467

Immediate Actions Required

• Identify all systems running Verypdf docPrint Pro 8.0 in your environment
• Restrict local access to systems with vulnerable installations where possible
• Consider disabling or uninstalling the affected application until a patch is available
• Implement application-level controls to limit who can access PDF encryption features
• Enable enhanced monitoring on affected systems to detect exploitation attempts

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor the VeryPDF Official Website for security updates and check the VulnCheck Advisory for the latest remediation guidance.

Workarounds

• Restrict access to the vulnerable application to trusted users only
• Implement application sandboxing to contain potential exploitation
• Use alternative PDF processing tools that are not affected by this vulnerability
• Deploy endpoint protection solutions with exploit prevention capabilities
• Apply Windows exploit mitigation techniques such as SEHOP (Structured Exception Handler Overwrite Protection) which may help mitigate SEH-based attacks

Organizations should consult the external references for additional technical details and monitor for vendor updates addressing this vulnerability.