CVE-2019-25555: Twistedbrush Pro Studio DOS Vulnerability

CVE-2019-25555 Overview

TwistedBrush Pro Studio 24.06 contains a denial of service vulnerability in the Script Recorder component that allows local attackers to crash the application by supplying an excessively large buffer. This improper buffer size calculation vulnerability (CWE-131) enables attackers to paste a malicious string containing 500,000 characters into the Description field of the Script Recorder dialog, triggering an application crash and resulting in a denial of service condition.

Critical Impact

Local attackers can cause complete application unavailability by exploiting improper input validation in the Script Recorder component, potentially disrupting creative workflows and causing data loss for unsaved work.

Affected Products

• Pixarra TwistedBrush Pro Studio version 24.06

Discovery Timeline

• 2026-03-21 - CVE-2019-25555 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2019-25555

Vulnerability Analysis

This denial of service vulnerability stems from improper handling of large input buffers in the Script Recorder component of TwistedBrush Pro Studio. When a user enters or pastes an excessively long string into the Description field of the Script Recorder dialog, the application fails to properly validate the input size before processing. The lack of input length validation allows an attacker to supply a buffer significantly larger than what the application expects to handle, leading to resource exhaustion or memory corruption that crashes the application.

The vulnerability requires local access to exploit, meaning an attacker would need to be able to interact with the application on the target system. While this limits the attack surface compared to remote vulnerabilities, it still poses a risk in multi-user environments or scenarios where an attacker has limited access to a system and wishes to disrupt legitimate users.

Root Cause

The root cause of CVE-2019-25555 is CWE-131: Incorrect Calculation of Buffer Size. The Script Recorder component fails to implement proper bounds checking on the Description field input. When processing user input, the application does not verify that the input length falls within acceptable parameters before allocating memory or copying the data. By supplying approximately 500,000 characters, an attacker can overwhelm the buffer handling logic, causing the application to crash.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have direct access to the TwistedBrush Pro Studio application. The exploitation process involves:

1. Opening TwistedBrush Pro Studio 24.06 on the target system
2. Navigating to the Script Recorder functionality
3. Accessing the Description field within the Script Recorder dialog
4. Pasting or entering a malicious string containing approximately 500,000 characters
5. The application crashes upon processing the oversized input

The attack requires no authentication beyond access to the application and no user interaction beyond the attacker's own actions. Additional technical details regarding this vulnerability can be found in the Exploit-DB #46844 entry and the VulnCheck Advisory on TwistedBrush.

Detection Methods for CVE-2019-25555

Indicators of Compromise

• Unexpected application crashes of TwistedBrush.exe with memory-related exceptions
• Event log entries indicating application hangs or termination in the Script Recorder module
• Abnormally large clipboard data transfers immediately preceding application crashes

Detection Strategies

• Monitor for repeated application crashes involving TwistedBrush Pro Studio, particularly when the Script Recorder feature is in use
• Implement application whitelisting and usage monitoring to detect unauthorized access to the software
• Use endpoint detection and response (EDR) solutions to identify patterns consistent with local denial of service attacks

Monitoring Recommendations

• Enable Windows Application Event Log monitoring for crash events associated with TwistedBrush Pro Studio
• Configure alerts for repeated application failures that may indicate exploitation attempts
• Monitor user activity within creative software environments to identify potential insider threats or compromised accounts

How to Mitigate CVE-2019-25555

Immediate Actions Required

• Restrict access to TwistedBrush Pro Studio 24.06 to trusted users only
• Evaluate the need for the Script Recorder feature and disable it if not required for business operations
• Update to a newer version of TwistedBrush Pro Studio if a patched version is available from Pixarra

Patch Information

No vendor patch information is currently available in the CVE data. Users are advised to check the Pixarra Official Website for any security updates or newer versions that may address this vulnerability.

Workarounds

• Limit clipboard functionality or implement clipboard size restrictions on systems running vulnerable versions
• Use application sandboxing to contain the impact of potential crashes
• Implement regular autosave mechanisms to minimize data loss in case of application crashes
• Consider deploying alternative digital art software until a patch is available

# Example: Restrict clipboard size on Windows (PowerShell)
# Note: This is a general mitigation approach and may affect other applications
Set-ItemProperty -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System" -Name "DisablePaste" -Value 1