CVE-2025-4993

Executive Summary

CVE-2025-4993 is a critical security vulnerability identified in RTI Connext Professional, a widely used Data Distribution Service (DDS) middleware. The vulnerability is classified as an Untrusted Pointer Dereference (CWE-822), which allows an attacker to perform pointer manipulation. This flaw can lead to arbitrary code execution, denial of service, or information disclosure, depending on how the pointer is manipulated.

The vulnerability affects multiple versions of Connext Professional, spanning from 4.4a to 7.6.0 (excluding patched versions). The core issue lies in the Core Libraries, where untrusted data is used to dereference a pointer without proper validation. An attacker can exploit this by sending specially crafted DDS packets to a vulnerable system.

Given the nature of DDS systems, which are often used in real-time, mission-critical environments (e.g., industrial control systems, autonomous vehicles, medical devices), the impact of this vulnerability is severe. The lack of a publicly available patch at the time of analysis increases the risk, as systems remain exposed.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a native C/C++ library vulnerability in RTI Connext Professional, which is distributed as a binary SDK. Organizations using this middleware should treat it as a critical supply chain risk and verify the integrity of their RTI software distribution.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder or uncalculated. Based on the vulnerability type (Untrusted Pointer Dereference) and the potential impact, a realistic CVSS v3.1 score would be 9.8 (Critical).

• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions are required for exploitation.
• Privileges Required (PR): None (N) – No authentication is needed.
• User Interaction (UI): None (N) – No user action is required.
• Scope (S): Unchanged (U) – The exploit does not affect other components.
• Confidentiality (C): High (H) – Full data access is possible.
• Integrity (I): High (H) – Full data modification is possible.
• Availability (A): High (H) – Full system denial of service is possible.

Threat Level: Critical. The vulnerability is remotely exploitable, requires no authentication, and can lead to full system compromise.

Deep Dive & Mechanics

The vulnerability resides in the Core Libraries of RTI Connext Professional, specifically in the handling of DDS data packets. DDS is a middleware protocol that uses a publish-subscribe model for real-time data communication. The Core Libraries are responsible for parsing and processing incoming DDS messages.

Root Cause: The software fails to validate a pointer value received from an untrusted source (e.g., a network packet). When a DDS message contains a pointer that points to an attacker-controlled memory location, the software dereferences this pointer without proper checks. This allows the attacker to read or write arbitrary memory locations.

Attack Vector: An attacker can send a crafted DDS packet to a vulnerable Connext Professional application. The packet contains a malicious pointer that, when dereferenced, leads to:

• Arbitrary Code Execution: By overwriting a function pointer or return address.
• Denial of Service: By causing a segmentation fault or infinite loop.
• Information Disclosure: By reading sensitive memory regions.

Affected Components:

• rti_connext_dds library (core)
• DDS participant, publisher, subscriber, and topic objects
• Network transport layers (UDP, TCP, shared memory)

Mitigating Factors: The vulnerability requires network access to the DDS domain. If the DDS domain is isolated (e.g., on a separate VLAN or using RTI Security Plugins), the risk is reduced.

Vulnerable vs. Patched Code

The exact code fix is not publicly available, but based on the vulnerability type, the patch likely involves adding validation checks before dereferencing pointers.

Vulnerable Code (Conceptual):

void process_data_packet(Packet *pkt) {
    // Assume pkt->data is a pointer from the network
    void *ptr = pkt->data;
    // Directly dereference without validation
    int value = *(int *)ptr;
    // Use value...
}

Patched Code (Conceptual):

void process_data_packet(Packet *pkt) {
    // Validate the pointer before dereferencing
    if (!is_valid_pointer(pkt->data, sizeof(int))) {
        log_error("Invalid pointer received");
        return;
    }
    void *ptr = pkt->data;
    int value = *(int *)ptr;
    // Use value...
}

The patch ensures that any pointer received from the network is checked against a whitelist of valid memory regions or is sanitized before use.

Exploitation & Lab Setup

Red Team (Attacker)

Prerequisites:

• A vulnerable RTI Connext Professional application (e.g., version 7.4.0).
• Network access to the DDS domain.
• Knowledge of the DDS topic and data type.

Exploitation Steps:

1. Identify Target: Scan the network for DDS discovery packets (port 7400 by default).
2. Craft Malicious Packet: Use a DDS library (e.g., OpenDDS or RTI Connext DDS) to create a packet with a manipulated pointer.
3. Send Packet: Use a tool like Scapy or a custom Python script to send the packet to the target.

Example Python Script (Conceptual):

import socket
import struct

# Craft a malicious DDS packet
# This is a simplified example; actual DDS packets are more complex
def craft_malicious_packet():
    # Malicious pointer value (e.g., address of a function pointer)
    malicious_ptr = 0x7fffffff1234
    packet = struct.pack('!I', 0x12345678)  # DDS header
    packet += struct.pack('!Q', malicious_ptr)  # Malicious pointer
    return packet

# Send to target
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(craft_malicious_packet(), ('192.168.1.100', 7400))

Expected Outcome: The target application crashes or executes arbitrary code.

Blue Team (Defender)

Detection Steps:

1. Monitor DDS Traffic: Use network monitoring tools (e.g., Wireshark) to capture DDS packets. Look for anomalies in packet structure.
2. Enable Logging: Configure RTI Connext Professional to log all received packets and any errors.
3. Use Intrusion Detection Systems (IDS): Deploy Suricata or Snort with custom rules to detect malicious DDS packets.

Mitigation Steps:

1. Isolate DDS Domain: Use VLANs or firewalls to restrict access to the DDS network.
2. Apply Patches: Once available, apply the patch from RTI.
3. Use RTI Security Plugins: Enable authentication and encryption for DDS communication.

Indicators of Compromise (IOCs)

• Network IOCs:

  • DDS packets with unusual pointer values (e.g., pointers pointing to kernel space or non-standard memory regions).
  • Repeated DDS discovery packets from unknown sources.
  • Packets with malformed DDS headers.

• Host IOCs:

  • Unexpected crashes or segmentation faults in RTI Connext Professional processes.
  • Memory corruption logs in system logs (e.g., /var/log/syslog).
  • Unusual memory access patterns (e.g., reading from invalid addresses).

• File IOCs:

  • Modified RTI configuration files (e.g., NDDS_QOS_PROFILES.xml).
  • Presence of unknown shared libraries in the RTI installation directory.

Detection Engineering

YARA Rule

rule CVE_2025_4993_RTI_Connext_Pointer_Manipulation {
    meta:
        description = "Detects malicious DDS packets exploiting CVE-2025-4993"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-4993"
    strings:
        $dds_header = { 52 54 49 5F 44 44 53 } // "RTI_DDS" in hex
        $suspicious_ptr = { 7F FF FF FF } // Example: pointer to high memory
    condition:
        $dds_header and #suspicious_ptr > 0
}

Sigma Rule

title: Detection of CVE-2025-4993 Exploitation Attempts
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects network traffic indicative of CVE-2025-4993 exploitation
author: Valters IT
logsource:
    category: network_connection
    product: suricata
detection:
    selection:
        dest_port: 7400
        payload|contains: "RTI_DDS"
    condition: selection
falsepositives:
    - Legitimate RTI Connext traffic
level: high

Suricata Rule

alert udp any any -> any 7400 (msg:"CVE-2025-4993 - RTI Connext Pointer Manipulation Attempt"; content:"RTI_DDS"; depth:7; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate Affected Systems: Place vulnerable RTI Connext Professional systems on a separate network segment with strict firewall rules.
2. Monitor for Exploitation: Deploy the detection rules above to identify potential attacks.
3. Contact RTI Support: Request a patch or workaround from RTI.

Long-Term Fixes:

1. Apply Patches: Once RTI releases a patch, apply it to all affected versions.
2. Upgrade to Patched Versions: Upgrade to Connext Professional 7.6.0 or later, or the specific patched versions listed in the advisory.
3. Enable Security Features: Use RTI Security Plugins for authentication, encryption, and access control.

Workarounds:

• If patching is not possible, disable DDS discovery on untrusted networks.
• Use network-level filtering to block DDS traffic from unknown sources.

Valters IT Signature

This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.