CVE-2021-47824
📋 TL;DR
iDailyDiary 4.30 contains a denial of service vulnerability where attackers can crash the application by pasting an extremely long string (2,000,000 characters) into the preferences tab name field. This affects all users running the vulnerable version of iDailyDiary, potentially causing data loss if unsaved diary entries are open during the crash.
💻 Affected Systems
- iDailyDiary
⚠️ 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 with potential loss of unsaved diary entries and disruption to user workflow.
Likely Case
Application becomes unresponsive and crashes, requiring restart and potentially losing recent unsaved work.
If Mitigated
Minimal impact with proper input validation and length restrictions in place.
🎯 Exploit Status
Exploitation requires physical or remote access to the target system and the ability to paste content into the preferences tab name field.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.splinterware.com/index.html
Restart Required: No
Instructions:
Check vendor website for updated version. If available, download and install the latest version of iDailyDiary.
🔧 Temporary Workarounds
Input Length Restriction
windowsManually restrict input length in the preferences tab name field to prevent buffer overflow.
Application Sandboxing
windowsRun iDailyDiary in a sandboxed environment to limit impact of crashes.
🧯 If You Can't Patch
- Educate users not to paste untrusted content into the preferences tab name field
- Implement regular backup procedures for diary entries to minimize data loss
🔍 How to Verify
Check if Vulnerable:
Check Help > About in iDailyDiary to see if version is 4.30. Attempt to paste a very long string into Preferences > Diary Tab Name field.Check Version:
Check Help > About menu within iDailyDiary applicationVerify Fix Applied:
After applying any workaround, attempt to paste a long string into the preferences tab name field to verify it's rejected or handled properly.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Windows Event Viewer application error logs
Network Indicators:
- No network indicators - this is a local application vulnerability
SIEM Query:
EventID=1000 OR EventID=1001 AND SourceName='Application Error' AND ProcessName='iDailyDiary.exe'