CVE-2019-25631: AIDA64 Business Buffer Overflow Flaw

CVE-2019-25631 Overview

CVE-2019-25631 is a structured exception handling (SEH) buffer overflow vulnerability in AIDA64 Business version 5.99.4900. This vulnerability allows local attackers to execute arbitrary code by overwriting SEH pointers with malicious shellcode. The attack is initiated through injection of egg hunter shellcode via the SMTP display name field in the application's preferences or report wizard functionality, ultimately triggering the overflow and enabling code execution with application privileges.

Critical Impact

Local attackers can leverage this SEH buffer overflow to achieve arbitrary code execution with the privileges of the AIDA64 application, potentially compromising the integrity, confidentiality, and availability of the affected system.

Affected Products

• AIDA64 Business 5.99.4900
• AIDA64 Business editions with vulnerable SMTP configuration handling

Discovery Timeline

• 2026-03-24 - CVE CVE-2019-25631 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2019-25631

Vulnerability Analysis

The vulnerability resides in AIDA64 Business's handling of user-supplied input within the SMTP configuration fields, specifically the display name parameter. When processing excessively long or specially crafted input in these fields, the application fails to properly validate buffer boundaries, leading to an overflow condition that corrupts the structured exception handler chain.

Structured Exception Handling (SEH) is a Windows mechanism for handling exceptions in applications. When an attacker can overwrite the SEH chain on the stack, they can redirect program execution to attacker-controlled code when an exception is triggered. In this case, the attacker crafts input containing an egg hunter shellcode payload, which is a small piece of code designed to search memory for and execute a larger payload marked with a unique "egg" signature.

The classification under CWE-787 (Out-of-bounds Write) reflects the core issue where data is written beyond the intended buffer boundaries, corrupting adjacent memory structures including the SEH pointers.

Root Cause

The root cause is insufficient input validation and boundary checking in the SMTP display name field handler within AIDA64 Business. The application does not enforce adequate length restrictions on user-provided input, allowing attackers to supply oversized data that overflows the allocated buffer and overwrites critical stack structures including the SEH chain.

Attack Vector

This is a local attack vector requiring the attacker to have access to the system running AIDA64 Business. The attack is executed by:

1. Accessing the AIDA64 Business preferences or report wizard functionality
2. Navigating to SMTP email configuration settings
3. Injecting specially crafted shellcode into the SMTP display name field
4. Triggering an exception condition that causes the application to walk the corrupted SEH chain
5. Redirecting execution to the attacker's egg hunter shellcode, which locates and executes the main payload

The vulnerability requires no special privileges beyond local access and no user interaction beyond normal application usage, making it relatively straightforward to exploit once an attacker has local system access.

For detailed technical analysis of the exploitation technique, refer to the Exploit-DB #46639 entry and the VulnCheck Advisory.

Detection Methods for CVE-2019-25631

Indicators of Compromise

• Unexpected crashes or exceptions in the aida64.exe process
• Abnormally large data stored in AIDA64 SMTP configuration settings
• Evidence of shellcode patterns (NOP sleds, egg signatures) in application configuration files
• Suspicious process spawning from the AIDA64 application context

Detection Strategies

• Monitor for crash dumps or exception handling events related to AIDA64 Business processes
• Implement application whitelisting to detect unauthorized code execution from AIDA64 process space
• Deploy endpoint detection solutions capable of identifying SEH overflow exploitation techniques
• Review AIDA64 configuration files for anomalous entries in SMTP-related settings

Monitoring Recommendations

• Enable Windows Event Logging for application crashes and exception events
• Configure endpoint detection and response (EDR) solutions to alert on SEH chain manipulation attempts
• Monitor process behavior for indicators of egg hunter shellcode execution patterns
• Implement integrity monitoring for AIDA64 configuration files

How to Mitigate CVE-2019-25631

Immediate Actions Required

• Upgrade AIDA64 Business to the latest available version from the official download page
• Restrict local access to systems running vulnerable versions of AIDA64 Business
• Implement application control policies to prevent unauthorized modifications to AIDA64 configurations
• Review and audit existing AIDA64 SMTP configurations for suspicious content

Patch Information

Users should update to a patched version of AIDA64 Business. Check the AIDA64 Official Website for the latest security updates and version information. Consult the VulnCheck Advisory for additional guidance on remediation.

Workarounds

• Disable or restrict access to SMTP email reporting functionality if not required
• Implement principle of least privilege to limit user access to AIDA64 configuration options
• Use network segmentation to isolate systems running vulnerable AIDA64 versions
• Deploy enhanced endpoint protection capable of detecting memory corruption exploits

# Configuration example - Restrict AIDA64 configuration access
# Set restrictive file permissions on AIDA64 configuration directory
icacls "C:\Program Files\FinalWire\AIDA64 Business" /inheritance:r /grant:r Administrators:F /grant:r SYSTEM:F