CVE-2018-25290: Easyboot Buffer Overflow Vulnerability

CVE-2018-25290 Overview

CVE-2018-25290 is a buffer overflow vulnerability affecting Easyboot version 6.6.0. The vulnerability exists in the Replace Text function of the application and allows local attackers to crash the application by supplying an oversized string input. Exploitation requires local access to the application where an attacker can navigate to File > Tools > Replace Text and paste a 7000-byte payload into the text fields, resulting in a denial of service condition.

Critical Impact

Local attackers can cause application crashes and denial of service by exploiting improper bounds checking in the Replace Text functionality.

Affected Products

• Easyboot 6.6.0
• EZB Systems Easyboot (Replace Text Function)

Discovery Timeline

• 2026-04-26 - CVE CVE-2018-25290 published to NVD
• 2026-04-27 - Last updated in NVD database

Technical Details for CVE-2018-25290

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), a classic buffer overflow condition. The application fails to properly validate the size of user-supplied input in the Replace Text dialog before copying it into a fixed-size buffer. When a user enters a string exceeding the expected buffer size, the overflow corrupts adjacent memory regions, leading to application instability and crashes.

The local attack vector means an attacker must have access to a system where Easyboot is installed and be able to interact with the application's graphical user interface. While this limits the attack surface, it still poses a risk in shared computing environments or scenarios where attackers have limited local access and seek to disrupt legitimate users.

Root Cause

The root cause of this vulnerability is insufficient input validation in the Replace Text function. The application allocates a fixed-size buffer for text input but does not enforce bounds checking when copying user-supplied data. When the input exceeds approximately 7000 bytes, the buffer overflow occurs, overwriting adjacent memory and causing the application to crash.

Attack Vector

The attack requires local access to a system running Easyboot 6.6.0. An attacker must navigate to the Replace Text feature through the application menu (File > Tools > Replace Text) and paste an oversized payload of approximately 7000 bytes into either of the text input fields. The application lacks proper input sanitization and buffer size validation, allowing the overflow to occur.

The exploitation path is straightforward and does not require special privileges or complex interactions. The vulnerability primarily enables denial of service through application crashes, affecting availability for legitimate users.

Detection Methods for CVE-2018-25290

Indicators of Compromise

• Unexpected crashes of the Easyboot application during Replace Text operations
• Application event logs showing memory access violations or buffer overflow exceptions
• Presence of abnormally large text inputs (7000+ bytes) in recent user activity

Detection Strategies

• Monitor for repeated application crashes in Easyboot processes
• Implement application whitelisting to control which users can access Easyboot functionality
• Deploy endpoint detection solutions capable of identifying buffer overflow exploitation attempts

Monitoring Recommendations

• Configure crash dump collection for the Easyboot application to capture forensic data
• Review Windows Event Logs for application faults related to Easyboot
• Implement user activity monitoring on systems with sensitive Easyboot deployments

How to Mitigate CVE-2018-25290

Immediate Actions Required

• Restrict access to Easyboot installations to trusted users only
• Consider removing or disabling Easyboot 6.6.0 from production systems until a patch is available
• Implement application control policies to limit exposure
• Review the VulnCheck Advisory on EasyBoot for additional guidance

Patch Information

No official patch information is currently available from the vendor. Users should check the EZB Systems Homepage for security updates. The vulnerability has been documented in Exploit-DB #45241 which provides technical details about the issue.

Workarounds

• Limit access to the Easyboot application to authorized personnel only
• Disable or restrict access to the Replace Text functionality if not required for business operations
• Implement endpoint protection solutions that can detect and prevent buffer overflow exploitation
• Consider migrating to alternative software if patches are not forthcoming from the vendor

# Example: Restrict file permissions on Windows (PowerShell)
# Limit which users can execute Easyboot
icacls "C:\Program Files\EasyBoot\EasyBoot.exe" /inheritance:r /grant:r "Administrators:RX"