CVE-2020-37189
📋 TL;DR
TaskCanvas 1.4.0 contains a buffer overflow vulnerability in the registration code input field that allows attackers to cause denial of service by crashing the application. Attackers can paste a specially crafted 1000-character payload into the registration field to trigger the crash. This affects all users running TaskCanvas 1.4.0.
💻 Affected Systems
- TaskCanvas
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash and denial of service, potentially disrupting business workflows that depend on TaskCanvas functionality.
Likely Case
Application becomes unresponsive and crashes, requiring manual restart and causing temporary service disruption.
If Mitigated
Minimal impact with proper input validation and boundary checking implemented.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID: 47911). The attack requires user interaction to paste the payload but requires no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates or consider workarounds.
🔧 Temporary Workarounds
Input Validation Implementation
allImplement client-side and server-side input validation to restrict registration field length to reasonable limits.
Application Firewall Rules
allDeploy web application firewall (WAF) rules to detect and block unusually long input strings in registration fields.
🧯 If You Can't Patch
- Restrict user access to TaskCanvas registration functionality
- Monitor application logs for crash events and unusual input patterns
🔍 How to Verify
Check if Vulnerable:
Test by pasting a 1000-character string into the TaskCanvas registration code input field and observing if the application crashes.Check Version:
Check TaskCanvas 'About' menu or application properties to verify version number.Verify Fix Applied:
After implementing input validation, test with the same 1000-character payload to ensure the application handles it properly without crashing.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected termination events
- Error messages related to buffer overflow
Network Indicators:
- Unusually long HTTP POST requests to registration endpoints
SIEM Query:
source="taskcanvas.log" AND ("crash" OR "terminated" OR "buffer")