CVE-2024-41435

Executive Summary

CVE-2024-41435 is a buffer overflow vulnerability discovered in YugabyteDB version 2.21.1.0. The flaw resides in the handling of the INSERT INTO SQL parameter, allowing an attacker to trigger a buffer overflow condition. This could lead to denial of service (DoS) or potentially arbitrary code execution in the context of the database process. No public proof-of-concept (PoC) or exploit code has been released, and the vendor has not yet issued a patch. The CVSS score is currently unassigned, but based on the nature of the vulnerability, it is considered high severity.

Supply Chain & Package Security

YugabyteDB is a distributed SQL database distributed as a binary package. The vulnerability is not in a package manager (NPM, PyPI, Go, Ruby) but in the core database binary. Users should verify the integrity of their YugabyteDB installation and monitor for official updates.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unassigned)
• Attack Vector (AV): Network (likely)
• Attack Complexity (AC): Low (likely)
• Privileges Required (PR): Low (requires SQL INSERT privilege)
• User Interaction (UI): None
• Scope (S): Unchanged
• Confidentiality (C): High (potential for memory read)
• Integrity (I): High (potential for memory write)
• Availability (A): High (DoS via crash)
• Threat Level: High (due to potential for RCE and lack of patch)

Deep Dive & Mechanics

The vulnerability is a classic buffer overflow in the SQL parser or query execution engine. When processing a crafted INSERT INTO statement, the software fails to properly validate the length of the input data before copying it into a fixed-size buffer. This allows an attacker to overwrite adjacent memory regions.

Root Cause: Insufficient bounds checking on the INSERT INTO parameter, likely in the string handling routines of the database's SQL parser.

Attack Vector: An authenticated user with INSERT privileges can send a malicious SQL query. The overflow occurs during parsing or execution, potentially corrupting the heap or stack.

Impact: Successful exploitation can cause a denial of service (database crash) or, with careful crafting, arbitrary code execution. This could lead to full database compromise, data exfiltration, or lateral movement within the network.

Vulnerable vs. Patched Code

Since no patch is available, a code-level comparison is not possible. However, the vulnerable code likely resembles:

// Vulnerable pseudo-code
void process_insert(char *input) {
    char buffer[256];
    strcpy(buffer, input); // No bounds check
}

A patched version would use safe functions:

// Patched pseudo-code
void process_insert(char *input) {
    char buffer[256];
    strncpy(buffer, input, sizeof(buffer) - 1);
    buffer[sizeof(buffer) - 1] = '\0';
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to a YugabyteDB instance (version 2.21.1.0)
• Database user with INSERT privilege
• Network connectivity to the database port (default 5433)

Exploitation Steps:

1. Connect to the database using a SQL client (e.g., ysqlsh).
2. Craft a malicious INSERT INTO statement with an overly long value.
3. Execute the query to trigger the overflow.

Example (conceptual):

INSERT INTO test_table (data) VALUES ('A' * 10000);

Note: No public exploit code exists. This is a theoretical attack vector.

Blue Team

Detection:

• Monitor database logs for abnormal SQL queries with excessively long strings.
• Use network monitoring to detect large payloads on port 5433.
• Implement database activity monitoring (DAM) solutions.

Mitigation:

• Restrict INSERT privileges to trusted users only.
• Apply network segmentation to limit access to the database.
• Use a Web Application Firewall (WAF) to filter malicious SQL patterns.
• Monitor for official patches from Yugabyte.

Indicators of Compromise (IOCs)

• Network: Unusually large SQL queries on port 5433.
• Logs: Database crash logs or error messages indicating buffer overflow.
• Process: YugabyteDB process crash or abnormal termination.
• File: Core dump files in the database data directory.

Detection Engineering

YARA Rule

rule CVE_2024_41435_YugabyteDB_BufferOverflow {
    meta:
        description = "Detects YugabyteDB buffer overflow attempt via INSERT INTO"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-41435"
    strings:
        $sql_pattern = /INSERT\s+INTO\s+\w+\s+VALUES\s*\([^)]{500,}\)/i
    condition:
        $sql_pattern
}

Sigma Rule

title: YugabyteDB Buffer Overflow Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects SQL queries with excessively long INSERT INTO values
author: Valters IT
date: 2025-04-10
logsource:
    category: application
    product: yugabytedb
detection:
    selection:
        query|contains: 'INSERT INTO'
        query|length: >= 500
    condition: selection
falsepositives:
    - Legitimate large data inserts
level: high

Suricata Rule

alert tcp $EXTERNAL_NET any -> $HOME_NET 5433 (msg:"CVE-2024-41435 YugabyteDB Buffer Overflow Attempt"; flow:to_server,established; content:"INSERT INTO"; nocase; pcre:"/INSERT\s+INTO\s+\w+\s+VALUES\s*\([^)]{500,}\)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade: No patch available. Monitor YugabyteDB releases for a fix.
2. Workaround: Restrict INSERT privileges to trusted users only.
3. Network: Limit access to port 5433 using firewall rules.
4. Monitoring: Enable detailed SQL logging and alert on long queries.

Long-term:

• Apply the official patch once released.
• Conduct a security audit of the database configuration.
• Implement database activity monitoring (DAM).

Valters IT
Securing your digital infrastructure.