CVE-2021-44488
📋 TL;DR
This vulnerability in YottaDB allows attackers to craft malicious input that triggers memory corruption through improper bounds checking in the memcpy function. Attackers could potentially execute arbitrary code or cause denial-of-service crashes. All users of affected YottaDB versions are vulnerable.
💻 Affected Systems
- YottaDB
📦 What is this software?
Gt.m by Fisglobal
Yottadb by Yottadb
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise and data exfiltration
Likely Case
Application crash causing denial of service and potential data corruption
If Mitigated
Limited impact if proper input validation and memory protections are in place
🎯 Exploit Status
Exploitation requires crafting specific input to trigger the vulnerable memcpy call
🛠️ 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
2. Restart all YottaDB processes and dependent applications
3. Verify the fix by checking version and testing with previously problematic inputs
🔧 Temporary Workarounds
Input validation wrapper
allImplement strict input validation for all data passed to YottaDB functions
# Implement application-level input validation
# Sanitize all user inputs before passing to op_fnfnumber
# Use parameterized queries and type checking
🧯 If You Can't Patch
- Implement network segmentation to isolate YottaDB instances from untrusted networks
- Deploy runtime application self-protection (RASP) or memory protection controls
🔍 How to Verify
Check if Vulnerable:
Check YottaDB version: ydb_dir/gtm_dist/mumps -version | grep 'r1.32\|V7.0-000'Check Version:
ydb_dir/gtm_dist/mumps -versionVerify Fix Applied:
Verify version is r1.34 or later: ydb_dir/gtm_dist/mumps -version | grep -v 'r1.32\|V7.0-000'📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in YottaDB logs
- Abnormal process termination
- Memory access violation messages
Network Indicators:
- Unusual input patterns to YottaDB services
- Repeated connection attempts with malformed data
SIEM Query:
source="yottadb.log" AND ("segmentation fault" OR "memory corruption" OR "SIGSEGV")