CVE-2023-48945
📋 TL;DR
A stack overflow vulnerability in OpenLink Virtuoso OpenSource v7.2.11 allows attackers to cause Denial of Service (DoS) by sending specially crafted SQL statements. This affects systems running vulnerable versions of Virtuoso database server. Attackers can crash the database service, disrupting availability of applications relying on it.
💻 Affected Systems
- OpenLink Virtuoso OpenSource
📦 What is this software?
Virtuoso by Openlinksw
⚠️ Risk & Real-World Impact
Worst Case
Complete database service crash requiring manual restart, potentially causing extended downtime and data corruption if transactions are interrupted.
Likely Case
Database service becomes unresponsive, requiring restart and causing temporary service disruption.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Exploitation requires sending SQL queries to the database endpoint. No authentication is required if database is configured to accept unauthenticated queries.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v7.2.12 or later
Vendor Advisory: https://github.com/openlink/virtuoso-opensource/issues/1172
Restart Required: Yes
Instructions:
1. Backup database and configuration. 2. Download latest Virtuoso version from official repository. 3. Stop Virtuoso service. 4. Install updated version. 5. Restart Virtuoso service. 6. Verify service is running and functional.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict database access to trusted IP addresses only
iptables -A INPUT -p tcp --dport 1111 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 1111 -j DROP
Query Filtering
allImplement SQL query filtering at application or proxy layer
🧯 If You Can't Patch
- Implement strict network segmentation to isolate database from untrusted networks
- Deploy WAF or database firewall with SQL injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check Virtuoso version: isql -U dba -P dba 'SELECT sys_stat('st_dbms_ver')'Check Version:
isql -U dba -P dba 'SELECT sys_stat('st_dbms_ver')'Verify Fix Applied:
Verify version is 7.2.12 or higher using same command and test with known safe SQL queries📡 Detection & Monitoring
Log Indicators:
- Database crash logs
- Stack overflow error messages in Virtuoso logs
- Unusual SQL query patterns
Network Indicators:
- Multiple malformed SQL queries to database port
- Sudden drop in database connections
SIEM Query:
source="virtuoso.log" AND ("stack overflow" OR "segmentation fault" OR "crash")