CVE-2019-25556 Overview
CVE-2019-25556 is a denial of service vulnerability affecting TwistedBrush Pro Studio version 24.06. The vulnerability exists in the Resize Image function and allows local attackers to crash the application by supplying an excessively long buffer. Attackers can exploit this flaw by pasting a malicious string into the New Width or New Height field, triggering a buffer overflow that causes the application to crash.
This vulnerability is classified as CWE-787 (Out-of-bounds Write), indicating that the application writes data past the end or before the beginning of the intended buffer when processing user-supplied input in the image resize dialog.
Critical Impact
Local attackers can cause application crashes and denial of service by exploiting improper input validation in the Resize Image function, potentially disrupting workflow for users of this digital art software.
Affected Products
- Pixarra TwistedBrush Pro Studio version 24.06
Discovery Timeline
- 2026-03-21 - CVE CVE-2019-25556 published to NVD
- 2026-03-24 - Last updated in NVD database
Technical Details for CVE-2019-25556
Vulnerability Analysis
This vulnerability is an out-of-bounds write (CWE-787) that occurs when TwistedBrush Pro Studio processes user input in the Resize Image dialog. The application fails to properly validate the length of input strings entered into the New Width and New Height fields before copying them into a fixed-size buffer.
When a user pastes an excessively long string into either of these input fields, the application attempts to process the oversized input without adequate bounds checking. This results in data being written beyond the allocated buffer boundaries, corrupting adjacent memory and causing the application to crash.
The local attack vector requires an attacker to have access to the system running TwistedBrush Pro Studio. While this limits the attack surface compared to remote vulnerabilities, it still poses a risk in shared computing environments or scenarios where malicious content could be delivered through social engineering.
Root Cause
The root cause of this vulnerability is insufficient input validation in the Resize Image function. The application does not enforce proper length restrictions on the New Width and New Height input fields before processing the data. When the application copies user-supplied strings into internal buffers without checking their length against the buffer size, an out-of-bounds write condition occurs.
This is a classic example of improper input validation leading to a buffer overflow condition. The developer assumed that users would only enter reasonable numeric values for image dimensions, but failed to account for malicious or malformed input that exceeds expected lengths.
Attack Vector
The attack vector for CVE-2019-25556 is local, requiring the attacker to have access to a system running TwistedBrush Pro Studio 24.06. The attack is executed through the following steps:
- Open TwistedBrush Pro Studio and load any image
- Navigate to the Resize Image function
- Paste an excessively long string (thousands of characters) into the New Width or New Height input field
- The application attempts to process the oversized input
- The buffer overflow occurs, causing the application to crash
Technical details and a proof of concept are available through the Exploit-DB #46843 entry. Additional information can be found in the VulnCheck Advisory for TwistedBrush.
Detection Methods for CVE-2019-25556
Indicators of Compromise
- Unexpected crashes of TwistedBrush.exe when using the Resize Image function
- Application error logs indicating memory access violations or buffer overflows
- Windows Event Log entries showing application faults with exception codes related to access violations
Detection Strategies
- Monitor for abnormal application terminations of TwistedBrush Pro Studio processes
- Implement application crash monitoring tools to detect repeated denial of service attempts
- Use endpoint detection solutions to identify unusual patterns of application crashes that may indicate exploitation attempts
Monitoring Recommendations
- Configure Windows Error Reporting to capture crash dumps for analysis
- Deploy endpoint monitoring to track application stability metrics for creative software suites
- Review system logs for patterns of repeated TwistedBrush crashes that could indicate targeted attacks
How to Mitigate CVE-2019-25556
Immediate Actions Required
- Verify the installed version of TwistedBrush Pro Studio and check Pixarra's official site for available updates
- Restrict access to systems running vulnerable versions of the software to trusted users only
- Consider using alternative image editing software until a patch is available if this functionality is critical
- Educate users about the risk of pasting untrusted content into application input fields
Patch Information
No specific vendor patch information is available in the current CVE data. Users should monitor Pixarra's official website for security updates and newer versions of TwistedBrush Pro Studio that may address this vulnerability. It is recommended to upgrade to the latest available version when updates are released.
Workarounds
- Avoid pasting content from untrusted sources into the Resize Image dialog fields
- Manually type dimension values rather than pasting from external sources
- Implement application allowlisting to prevent unauthorized modifications to the TwistedBrush installation
- Consider sandboxing the application to limit the impact of crashes on the broader system
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
