CVE-2024-57637

Executive Summary

CVE-2024-57637 is a denial-of-service (DoS) vulnerability in the OpenLink Virtuoso Open-Source edition, version 7.2.11. The flaw resides in the dfe_unit_gb_dependant component and can be triggered by sending crafted SQL statements. An attacker with network access to the Virtuoso database service can exploit this to cause the service to crash or become unresponsive, leading to a denial of service. No public proof-of-concept (PoC) or patch is currently available. The vulnerability has a CVSS score of 0.0 (pending analysis) and an EPSS score of 0.0%, indicating low exploitation activity at the time of reporting.

Supply Chain & Package Security

This vulnerability affects the OpenLink Virtuoso Open-Source package, which is a multi-model database server. Organizations using Virtuoso in their supply chain (e.g., as a data integration or graph database component) should assess their exposure. The lack of a patch means that any deployment of version 7.2.11 is potentially vulnerable.

CVSS Breakdown & Threat Level

The CVSS score is currently 0.0, indicating that the NVD has not yet assigned a severity rating. Based on the description, the vulnerability is likely to have the following characteristics:

• Attack Vector (AV): Network (N) – The attack is performed over the network.
• Attack Complexity (AC): Low (L) – Crafting SQL statements is generally straightforward.
• Privileges Required (PR): None (N) – No authentication is required to send the malicious SQL.
• User Interaction (UI): None (N) – No user interaction is needed.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): None (N) – No data is exposed.
• Integrity (I): None (N) – No data is modified.
• Availability (A): High (H) – The service becomes unavailable.

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Estimated Base Score: 7.5 (High)

Threat Level: Medium. While the impact is limited to availability, the ease of exploitation and lack of a patch make this a concern for exposed instances.

Deep Dive & Mechanics

The vulnerability is located in the dfe_unit_gb_dependant function within the Virtuoso SQL engine. This function is likely involved in processing SQL queries that involve unit conversion or dependency resolution (e.g., GB as a unit of data storage). The exact mechanism is not publicly documented, but based on the description, the following is hypothesized:

1. Crafted SQL Statement: An attacker sends a specially crafted SQL query that includes a reference to a unit (e.g., GB) in a way that triggers a flaw in the dfe_unit_gb_dependant function.
2. Memory Corruption or Infinite Loop: The crafted input may cause a buffer overflow, null pointer dereference, or an infinite loop within the function.
3. Service Crash: The flaw leads to a crash of the Virtuoso server process, making the database unavailable to legitimate users.

The vulnerability is specific to the Open-Source edition of Virtuoso version 7.2.11. It is not known if the commercial edition is affected.

Vulnerable vs. Patched Code

No patched version is available. The vulnerable code is in the dfe_unit_gb_dependant function. Without a patch, the exact code change cannot be shown. However, a typical fix would involve:

• Adding input validation to ensure that unit strings are properly sanitized.
• Implementing bounds checking to prevent buffer overflows.
• Adding error handling to gracefully reject malformed queries instead of crashing.

Vulnerable Code (Hypothetical):

// Vulnerable: No bounds checking on unit string
void dfe_unit_gb_dependant(char *unit) {
    char buffer[64];
    strcpy(buffer, unit); // Potential buffer overflow
    // ... process unit ...
}

Patched Code (Hypothetical):

// Patched: Bounds checking and safe string copy
void dfe_unit_gb_dependant(char *unit) {
    char buffer[64];
    if (strlen(unit) >= sizeof(buffer)) {
        // Log error and return gracefully
        return;
    }
    strncpy(buffer, unit, sizeof(buffer) - 1);
    buffer[sizeof(buffer) - 1] = '\0';
    // ... process unit ...
}

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install OpenLink Virtuoso Open-Source v7.2.11 on a Linux VM.
2. Ensure the Virtuoso server is running and accessible on port 1111 (default).
3. Use a SQL client (e.g., isql) to connect to the server.

Exploitation Steps:

1. Connect to the Virtuoso server:

   isql 1111 dba dba
   

2. Execute a crafted SQL statement designed to trigger the vulnerability. Since no public PoC exists, the exact payload is unknown. A typical approach would be to try:

   -- Attempt to trigger a crash with a long unit string
   SELECT 'A' * 10000 GB;
   

   Or:

   -- Attempt to trigger a crash with a malformed unit expression
   SELECT 1 GB FROM (SELECT 1) AS t WHERE 1 = 1;
   

3. Monitor the Virtuoso server process. If the exploit is successful, the server will crash or become unresponsive.

Expected Outcome: The Virtuoso server process terminates, causing a denial of service.

Blue Team (Defensive)

Detection:

• Monitor for unusual SQL queries that contain long strings or malformed unit expressions.
• Monitor for crashes of the virtuoso-t process.
• Use network monitoring to detect connections to port 1111 from unexpected sources.

Mitigation:

• Restrict network access to the Virtuoso server using a firewall.
• Use a Web Application Firewall (WAF) or database firewall to filter malicious SQL statements.
• If possible, upgrade to a newer version of Virtuoso once a patch is released.
• As a temporary workaround, disable the dfe_unit_gb_dependant functionality if possible (unlikely without source code modification).

Indicators of Compromise (IOCs)

• Network:
  • Connections to port 1111 (Virtuoso default) from suspicious IP addresses.
  • SQL queries containing unusually long strings or malformed unit expressions.
• System:
  • Unexpected termination of the virtuoso-t process.
  • Core dump files generated by the Virtuoso server.
  • Log entries in the Virtuoso log file (e.g., /var/lib/virtuoso/db/virtuoso.log) indicating a crash.
• File:
  • Core dump files: core or virtuoso-t.core in the Virtuoso data directory.

Detection Engineering

YARA Rule

rule CVE_2024_57637_Virtuoso_DoS {
    meta:
        description = "Detects potential exploit attempts for CVE-2024-57637 in Virtuoso logs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-57637"
    strings:
        $sql1 = /SELECT.*GB/i
        $sql2 = /[A-Za-z0-9]{100,}\s+GB/i
        $crash = /FATAL|SIGNAL|SEGFAULT|ABORT/i
    condition:
        any of ($sql*) and $crash
}

Sigma Rule

title: CVE-2024-57637 Virtuoso DoS Exploit Attempt
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects SQL queries that may attempt to exploit CVE-2024-57637 in Virtuoso logs
author: Valters IT
date: 2025-04-10
logsource:
    category: application
    product: virtuoso
detection:
    selection:
        EventID: 1
        Message|contains|all:
            - 'SELECT'
            - 'GB'
    condition: selection
falsepositives:
    - Legitimate use of GB unit in SQL queries
level: high

Suricata Rule

alert tcp $EXTERNAL_NET any -> $HOME_NET 1111 (msg:"CVE-2024-57637 Virtuoso DoS Exploit Attempt"; flow:to_server,established; content:"SELECT"; nocase; content:"GB"; nocase; distance:0; within:100; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

1. Patch: No patch is currently available. Monitor the OpenLink Virtuoso website and GitHub repository for updates.
2. Workaround: Restrict network access to the Virtuoso server to trusted IP addresses only. Use a firewall to block port 1111 from the internet.
3. Mitigation: Implement a database firewall or WAF to inspect and block SQL queries that contain suspicious patterns (e.g., very long strings, malformed unit expressions).
4. Monitoring: Enable detailed logging on the Virtuoso server and monitor for crashes or unusual SQL queries.
5. Upgrade: Once a patched version is released (e.g., 7.2.12 or later), upgrade immediately.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence. For questions, contact intelligence@valters-it.com.