CVE-2021-44483
📋 TL;DR
This vulnerability in YottaDB allows attackers to crash applications by triggering a divide-by-zero error through improper input validation. It affects all users running vulnerable versions of YottaDB, potentially disrupting database operations and dependent services.
💻 Affected Systems
- YottaDB
📦 What is this software?
Gt.m by Fisglobal
Yottadb by Yottadb
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service causing application crashes, database unavailability, and disruption of critical business processes relying on YottaDB.
Likely Case
Application crashes leading to service interruptions, requiring manual restarts and potentially causing data inconsistency if transactions are interrupted.
If Mitigated
Limited impact with proper input validation at application layer, but still vulnerable to malicious internal users or compromised applications.
🎯 Exploit Status
Exploitation requires the ability to call the vulnerable eb_div function, which typically requires application-level access. The vulnerability is straightforward to trigger once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after r1.32 and V7.0-000
Vendor Advisory: https://gitlab.com/YottaDB/DB/YDB/-/issues/828
Restart Required: Yes
Instructions:
1. Upgrade YottaDB to version r1.34 or later (or V7.0-001 or later for V7.0 series). 2. Restart all applications and services using YottaDB. 3. Verify the fix by checking version and testing previously vulnerable functionality.
🔧 Temporary Workarounds
Input validation wrapper
allAdd input validation in application code to check for zero denominators before calling YottaDB division functions
# Application-specific code required - no universal command
🧯 If You Can't Patch
- Implement strict input validation at application layer to prevent zero values from reaching YottaDB division operations
- Isolate YottaDB instances, restrict access to only trusted applications, and monitor for crash events
🔍 How to Verify
Check if Vulnerable:
Check YottaDB version: ydb_dir/gtm_dist/mumps -version | grep 'YottaDB release'Check Version:
$ydb_dist/mumps -versionVerify Fix Applied:
Verify version is r1.34+ or V7.0-001+, then test division operations with zero denominators to ensure graceful error handling📡 Detection & Monitoring
Log Indicators:
- Application crashes with division-related errors
- YottaDB process termination logs
- Core dumps in YottaDB working directories
Network Indicators:
- Sudden drop in database connections
- Increased error responses from applications using YottaDB
SIEM Query:
source="yottadb.log" AND ("divide by zero" OR "SIGFPE" OR "floating point exception")