CVE-2020-37189 Overview
CVE-2020-37189 is a denial of service vulnerability in Digital Volcano TaskCanvas 1.4.0. The flaw exists in the registration code input field, which fails to properly validate the length of user-supplied input. An attacker with local access can paste a 1000-character buffer payload into the registration field to trigger an application crash. The vulnerability is classified under [CWE-120] Buffer Copy without Checking Size of Input. Successful exploitation results in loss of availability for the affected application, though no code execution or data compromise has been demonstrated.
Critical Impact
An attacker with local access to TaskCanvas 1.4.0 can crash the application by pasting an oversized string into the registration code field, disrupting availability for legitimate users.
Affected Products
- Digital Volcano TaskCanvas 1.4.0
- Registration code input handling component
- Windows desktop installations of TaskCanvas
Discovery Timeline
- 2026-02-11 - CVE-2020-37189 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2020-37189
Vulnerability Analysis
The vulnerability resides in how TaskCanvas 1.4.0 processes input submitted to its registration code field. The application accepts user input without enforcing a maximum length boundary. When a string of approximately 1000 characters is pasted into the field, the application fails to handle the oversized buffer and terminates unexpectedly. This behavior is consistent with the [CWE-120] classification, where the receiving buffer or downstream string operation cannot accommodate the supplied data. The result is a process crash that interrupts any in-progress task management work for the user.
Root Cause
The root cause is missing input length validation on the registration code field. The application does not enforce a maximum character count at the user interface layer, nor does it sanitize or truncate oversized strings before passing them to internal string-handling routines. When an unexpectedly long string is supplied, the resulting buffer copy or string operation causes the process to fault.
Attack Vector
Exploitation requires local access to a system running TaskCanvas 1.4.0 and user interaction with the registration dialog. An attacker generates a 1000-character payload using a pattern generator and pastes the string into the registration code input field. Submitting or processing the field triggers the crash. The attack does not provide code execution or privilege escalation. It is limited to denying availability of the TaskCanvas application on the affected host.
No verified proof-of-concept code is reproduced here. Technical details and a public exploit demonstration are available in Exploit-DB #47911 and the VulnCheck DoS Advisory.
Detection Methods for CVE-2020-37189
Indicators of Compromise
- Unexpected termination of the TaskCanvas process shortly after a user interacts with the registration dialog
- Windows Application Event Log entries showing a faulting TaskCanvas.exe module with an access violation or buffer-related exception
- Repeated crash reports from the same workstation correlated to clipboard paste events into TaskCanvas
Detection Strategies
- Monitor process termination events for TaskCanvas binaries and correlate with preceding user-input events
- Inspect Windows Error Reporting (WER) artifacts for crashes referencing the TaskCanvas registration component
- Hunt for crash dumps where the faulting input contains long repeating-pattern strings characteristic of buffer-generation tools
Monitoring Recommendations
- Enable application crash telemetry collection on endpoints where TaskCanvas is installed
- Alert on repeated TaskCanvas crashes from a single user session within a short time window
- Track installation inventory for TaskCanvas 1.4.0 to scope exposure across the environment
How to Mitigate CVE-2020-37189
Immediate Actions Required
- Identify all endpoints running TaskCanvas 1.4.0 and inventory affected installations
- Restrict use of TaskCanvas 1.4.0 on shared or multi-user workstations until a fixed release is confirmed
- Inform end users that pasting untrusted content into the registration field can crash the application
Patch Information
No vendor patch is referenced in the NVD record at the time of publication. Administrators should consult the Digital Volcano Homepage and the TaskCanvas Download Page for any updated builds beyond version 1.4.0 that address the registration input handling defect.
Workarounds
- Avoid pasting untrusted or unusually long strings into the TaskCanvas registration code field
- Limit TaskCanvas execution to trusted local users until a fixed version is available
- Configure application allow-listing to control which users may launch TaskCanvas in sensitive environments
# Example: inventory TaskCanvas installations across Windows endpoints
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like "*TaskCanvas*" } | Select-Object Name, Version, InstallDate
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
