CVE-2023-31616 – This SQL injection vulnerability in the bif

Q: What is the severity of CVE-2023-31616?

CVE-2023-31616 has a CVSS score of 7.5 (HIGH). This SQL injection vulnerability in the bif_mod component of OpenLink Virtuoso allows attackers to execute crafted SQL statements that crash the database server, causing denial of service. It affects organizations running vulnerable versions of Virtuoso Open Source Edition. The vulnerability requires SQL execution privileges to exploit.

📋 TL;DR

This SQL injection vulnerability in the bif_mod component of OpenLink Virtuoso allows attackers to execute crafted SQL statements that crash the database server, causing denial of service. It affects organizations running vulnerable versions of Virtuoso Open Source Edition. The vulnerability requires SQL execution privileges to exploit.

💻 Affected Systems

Products:

OpenLink Virtuoso Open Source Edition

Versions: v7.2.9 specifically (and potentially earlier versions with same bif_mod component)

Operating Systems: All platforms running Virtuoso (Linux, Windows, macOS)

Default Config Vulnerable: ⚠️ Yes

Notes: Requires bif_mod component to be enabled and accessible via SQL interface. The vulnerability is triggered through SQL execution, not through default web interfaces.

📦 What is this software?

Virtuoso by Openlinksw

View all CVEs affecting Virtuoso →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete database service disruption requiring restart, potential data corruption if crash occurs during transactions, and extended downtime for recovery.

🟠

Likely Case

Temporary service interruption affecting dependent applications, requiring database restart and causing brief application downtime.

🟢

If Mitigated

Minimal impact with proper input validation, query parameterization, and least privilege access controls in place.

🌐 Internet-Facing: MEDIUM - Requires SQL execution access, but if database endpoints are exposed with vulnerable credentials, exploitation is possible.

🏢 Internal Only: MEDIUM - Internal attackers or compromised accounts with SQL access can trigger the DoS condition.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW - Requires SQL injection capability but specific payload is straightforward once identified.

Exploitation requires ability to execute SQL statements against the bif_mod component. No public exploit code has been released as of knowledge cutoff.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check GitHub issue #1122 for specific fix version as patch may be in development branch

Vendor Advisory: https://github.com/openlink/virtuoso-opensource/issues/1122

Restart Required: Yes

Instructions:

1. Monitor the GitHub issue for official patch release. 2. Upgrade to patched version when available. 3. Restart Virtuoso service after upgrade. 4. Test database functionality post-upgrade.

🔧 Temporary Workarounds

Disable bif_mod component

all

Temporarily disable the vulnerable bif_mod component if not required for functionality

Modify Virtuoso configuration to disable bif_mod or remove/rename bif_mod shared library

Implement SQL input validation

all

Add application-layer validation to reject suspicious SQL patterns before reaching database

Implement parameterized queries and input sanitization in all database-connected applications

🧯 If You Can't Patch

Implement strict network segmentation to limit database access to authorized applications only
Apply principle of least privilege to database accounts and restrict bif_mod function access

🔍 How to Verify

Check if Vulnerable:

Check Virtuoso version with: isql -V or examine virtuoso.ini for version information. If running v7.2.9, assume vulnerable.

Check Version:

isql -V 2>&1 | grep Version || cat /etc/virtuoso/virtuoso.ini | grep VersionString

Verify Fix Applied:

After patching, verify version is updated and test bif_mod functionality with safe SQL queries to ensure stability.

📡 Detection & Monitoring

Log Indicators:

Database crash logs
Unexpected bif_mod component errors
SQL syntax errors with unusual patterns
Service restart events

Network Indicators:

Unusual SQL query patterns to database
Multiple failed connection attempts followed by service disruption

SIEM Query:

source="virtuoso.log" AND ("crash" OR "segfault" OR "bif_mod" AND "error")

📊 Metadata

CVE ID: CVE-2023-31616

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-89

Published: May 15, 2023

Last Updated: January 23, 2025

🔗 References

https://github.com/openlink/virtuoso-opensource/issues/1122 Exploit,Issue Tracking,Patch
https://github.com/openlink/virtuoso-opensource/issues/1122 Exploit,Issue Tracking,Patch

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