Executive Summary

CVE-2019-25626 is a local buffer overflow vulnerability in River Past Cam Do version 3.7.6. It occurs in the activation code input field, where an attacker can supply a specially crafted activation code string that is too long and contains malicious data.

This crafted input overflows a buffer by filling it with 608 bytes of junk data followed by shellcode and Structured Exception Handler (SEH) overwrite values. When the activation dialog processes this input, the overflow overwrites the SEH chain, allowing the attacker to redirect execution flow to the injected shellcode.

This enables the attacker to execute arbitrary code locally on the affected system.

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Impact Analysis

This vulnerability allows a local attacker to execute arbitrary code on the affected system without requiring any privileges or user interaction.

Successful exploitation can lead to full compromise of the system, including unauthorized access, modification, or destruction of data, and disruption of system availability.

Because the attacker can run arbitrary code, they could install malware, create backdoors, or perform other malicious activities.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability is a local buffer overflow in the activation code input field of River Past Cam Do 3.7.6, which requires local interaction with the application. Detection involves verifying if the vulnerable version of the software is installed and monitoring for attempts to input excessively long activation codes.'}, {'type': 'paragraph', 'content': 'Since the exploit involves pasting a malicious activation code string, detection can be done by checking for unusually long or malformed activation code inputs in application logs or by monitoring clipboard contents if possible.'}, {'type': 'paragraph', 'content': 'No specific network detection commands are applicable because this is a local vulnerability triggered by user input in the application.'}, {'type': 'paragraph', 'content': 'Suggested commands to check for the presence of the vulnerable software on a Windows system include:'}, {'type': 'list_item', 'content': 'wmic product where "name like \'%River Past Cam Do%\'" get name, version'}, {'type': 'list_item', 'content': 'Get-ItemProperty -Path "HKLM:\\Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\*" | Where-Object { $_.DisplayName -like \'*River Past Cam Do*\' } | Select-Object DisplayName, DisplayVersion'}, {'type': 'paragraph', 'content': 'To detect exploitation attempts, monitor for processes or scripts that generate or paste large activation code strings (e.g., the 608-byte junk data payload) or unusual application crashes related to the activation dialog.'}] [1, 2]

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Mitigation Strategies

Immediate mitigation steps include:

• Avoid using River Past Cam Do version 3.7.6 or earlier until a patch or update is available.
• Do not enter or accept activation codes from untrusted sources.
• Restrict local access to systems running the vulnerable software to trusted users only.
• Monitor and audit usage of the activation code input field for suspicious activity.

If possible, contact the vendor or check for updates or patches that address this buffer overflow vulnerability.

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