CVE-2024-57631

Executive Summary

CVE-2024-57631 is a denial-of-service (DoS) vulnerability in MonetDB Server v11.49.1, specifically within the exp_ref component. An attacker can exploit this flaw 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 pending), and no public exploit code or patch is currently available. The EPSS score is 0.0%, indicating low exploitation activity in the wild. This report provides a comprehensive technical analysis, detection guidance, and mitigation strategies for security teams.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (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: Medium (due to DoS impact and lack of patch)

Deep Dive & Mechanics

The vulnerability resides in the exp_ref component of MonetDB Server v11.49.1. The exp_ref function is responsible for handling expression references during SQL query processing. When a specially crafted SQL statement is executed, it triggers an infinite loop, memory exhaustion, or a null pointer dereference within this component, leading to a denial of service.

Root Cause: Improper input validation or boundary checking in the exp_ref function when processing recursive or self-referencing expressions. The attacker can exploit this by sending a query that causes the parser to enter an unexpected state, consuming excessive CPU or memory resources.

Attack Vector: Remote, unauthenticated (if the database is exposed). The attacker only needs network access to the MonetDB server and the ability to send SQL queries.

Vulnerable vs. Patched Code

Vulnerable Code (MonetDB v11.49.1): The vulnerable code is in the exp_ref function within the MonetDB source. The exact code is not publicly available, but the issue likely involves improper handling of recursive or deeply nested expressions.

// Hypothetical vulnerable code snippet
static sql_exp *exp_ref(sql_allocator *sa, sql_rel *rel, sql_exp *e) {
    // Missing check for self-reference or infinite recursion
    if (e->type == e_column && e->l && e->r) {
        // Recursive call without depth limit
        return exp_ref(sa, rel, e->l);
    }
    return e;
}

Patched Code (Hypothetical): A patch would introduce a depth counter or a check to prevent infinite recursion.

// Hypothetical patched code snippet
static sql_exp *exp_ref(sql_allocator *sa, sql_rel *rel, sql_exp *e, int depth) {
    if (depth > MAX_EXPR_DEPTH) {
        return NULL; // or raise an error
    }
    if (e->type == e_column && e->l && e->r) {
        return exp_ref(sa, rel, e->l, depth + 1);
    }
    return e;
}

Exploitation & Lab Setup

Red Team (Exploitation):

1. Setup: Deploy MonetDB Server v11.49.1 in a controlled lab environment.
2. Craft Payload: Create a SQL statement that triggers the vulnerability. For example, a query with deeply nested or self-referencing expressions.

-- Example crafted SQL statement (hypothetical)
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