CVE-2019-25435: Sricam Deviceviewer Buffer Overflow Bug

CVE-2019-25435 Overview

CVE-2019-25435 is a stack-based buffer overflow vulnerability in Sricam DeviceViewer version 3.12.0.1. The vulnerability exists in the user management add user function, allowing authenticated attackers to execute arbitrary code by bypassing Data Execution Prevention (DEP). Attackers can inject a malicious payload through the Username field in User Management to trigger the overflow and execute commands via Return-Oriented Programming (ROP) chain gadgets.

Critical Impact

Successful exploitation enables arbitrary code execution on the local system, potentially leading to complete system compromise, data theft, or lateral movement within the network.

Affected Products

• Sricam DeviceViewer 3.12.0.1

Discovery Timeline

• 2026-02-20 - CVE CVE-2019-25435 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2019-25435

Vulnerability Analysis

This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow). The flaw occurs within the user management functionality of Sricam DeviceViewer, specifically in the add user function. When a user provides input through the Username field, the application fails to properly validate the length of the input before copying it to a fixed-size stack buffer.

The local attack vector requires user interaction, as an attacker must convince a victim to interact with the malicious input or have local access to the system running DeviceViewer. Despite DEP protections being present, the vulnerability can be exploited through carefully crafted ROP chain gadgets that chain together existing executable code snippets to achieve arbitrary code execution.

Root Cause

The root cause is improper input validation in the Username field handler within the User Management functionality. The application allocates a fixed-size buffer on the stack for storing username data but does not enforce boundary checks when copying user-supplied input. This allows an attacker to write beyond the allocated buffer space, overwriting adjacent stack memory including the return address.

Attack Vector

The attack is executed locally and requires the attacker to have access to the Sricam DeviceViewer application. The exploitation flow involves:

1. An attacker accesses the User Management feature within DeviceViewer
2. In the add user dialog, the attacker enters a specially crafted payload in the Username field
3. The payload contains padding to reach the return address, followed by ROP gadgets to bypass DEP
4. When the function returns, control flow is redirected through the ROP chain
5. The ROP chain eventually pivots to execute attacker-controlled shellcode or system commands

The exploitation leverages ROP (Return-Oriented Programming) techniques to circumvent DEP protections by chaining together legitimate code snippets that end in return instructions. For detailed technical information and proof-of-concept details, refer to Exploit-DB #47477 and the VulnCheck Advisory.

Detection Methods for CVE-2019-25435

Indicators of Compromise

• Unexpected crashes or errors in Sricam DeviceViewer, particularly when accessing User Management functions
• Anomalous process behavior spawned from the DeviceViewer executable
• Suspicious memory access patterns or DEP violation events in Windows Event logs
• Unexpected child processes or command execution originating from the DeviceViewer process

Detection Strategies

• Monitor for abnormally long input strings being submitted to DeviceViewer application fields
• Implement endpoint detection rules to identify ROP-chain exploitation patterns
• Enable DEP violation logging and alert on repeated violations from DeviceViewer
• Use application whitelisting to detect unauthorized code execution from within DeviceViewer's process space

Monitoring Recommendations

• Enable enhanced logging for the Sricam DeviceViewer application
• Monitor process creation events for any child processes spawned by DeviceViewer
• Implement memory integrity monitoring on systems running the vulnerable software
• Review Windows Application logs for crash events related to DeviceViewer.exe

How to Mitigate CVE-2019-25435

Immediate Actions Required

• Restrict access to systems running Sricam DeviceViewer 3.12.0.1 to trusted users only
• Consider disabling User Management functionality if not required for operations
• Implement application sandboxing or containerization to limit the impact of potential exploitation
• Monitor the Sricam website for security updates or newer versions

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should contact Sricam directly for guidance on obtaining a patched version or check for updated releases on their official website. Until a patch is available, implementing the recommended workarounds is critical.

Workarounds

• Limit access to the DeviceViewer application to only essential personnel
• Implement network segmentation to isolate systems running the vulnerable software
• Use Endpoint Detection and Response (EDR) solutions like SentinelOne to monitor for exploitation attempts
• Consider using alternative camera management software if available from Sricam
• Apply principle of least privilege to user accounts that interact with DeviceViewer

# Windows: Enable DEP for all applications (additional hardening)
bcdedit /set nx AlwaysOn

# Verify DEP status
wmic OS Get DataExecutionPrevention_SupportPolicy