CVE-2024-54129: NASA ION-DTN DoS Vulnerability

CVE-2024-54129 Overview

A critical denial of service vulnerability exists in NASA's Interplanetary Overlay Network (ION-DTN), an implementation of Delay/Disruption Tolerant Networking (DTN) used for space communications. The vulnerability affects ION-DTN BPv7 implementation version 4.1.3 and can be triggered when receiving a bundle with an improper reference to the imc scheme with valid Service-Specific Part (SSP) in the Previous Node Block, causing the ION service to become completely unresponsive.

Critical Impact

This vulnerability allows remote attackers to cause denial of service conditions in NASA's ION-DTN networking implementation, potentially disrupting critical space communication infrastructure.

Affected Products

• NASA ION-DTN BPv7 Implementation version 4.1.3
• Systems utilizing ION-DTN for Delay/Disruption Tolerant Networking

Discovery Timeline

• 2024-12-05 - CVE CVE-2024-54129 published to NVD
• 2024-12-05 - Last updated in NVD database

Technical Details for CVE-2024-54129

Vulnerability Analysis

This vulnerability is classified under CWE-665 (Improper Initialization), indicating that the ION-DTN implementation fails to properly initialize or validate certain data structures when processing incoming bundles. The flaw specifically manifests when the Previous Node Block contains an improper reference to the imc (Inter-Planetary Multicast) scheme combined with a syntactically valid Service-Specific Part (SSP).

The vulnerability enables remote attackers to craft malicious bundles that exploit the improper initialization, leading to a denial of service condition. Since DTN protocols are designed for challenged network environments including space communications, the impact of rendering a node unresponsive could be significant for mission-critical operations.

Root Cause

The root cause stems from improper initialization (CWE-665) in the bundle parsing logic. When ION-DTN processes an incoming bundle, it fails to properly validate or initialize state when encountering specific combinations of imc scheme references within the Previous Node Block. This improper handling results in the service entering an unresponsive state rather than gracefully rejecting the malformed input.

Attack Vector

The attack can be executed remotely over a network connection. An attacker would need to craft a specially formatted DTN bundle containing:

1. A Previous Node Block with an improper reference to the imc scheme
2. A valid Service-Specific Part (SSP) within that reference

When the vulnerable ION-DTN node receives and attempts to process this malformed bundle, the improper initialization causes the service to hang or crash, effectively denying service to legitimate DTN communications.

The vulnerability mechanism involves malformed bundle construction targeting the Previous Node Block parsing. When the parser encounters an improperly referenced imc scheme with valid SSP components, it fails to properly initialize internal state, leading to the denial of service condition. For detailed technical information, refer to the GitHub Security Advisory.

Detection Methods for CVE-2024-54129

Indicators of Compromise

• Unexpected ION-DTN service unresponsiveness or crashes
• Unusual network traffic patterns containing malformed DTN bundles targeting the Previous Node Block
• Service restart events without apparent cause in ION-DTN logs
• Incoming bundles with suspicious imc scheme references in Previous Node Block fields

Detection Strategies

• Monitor ION-DTN service availability and implement automated health checks to detect unresponsive states
• Implement network traffic analysis to identify malformed DTN bundles with unusual Previous Node Block constructs
• Deploy logging and alerting for ION-DTN parsing errors or exceptions related to bundle processing
• Establish baseline behavior for DTN communications and alert on anomalies

Monitoring Recommendations

• Configure continuous monitoring of ION-DTN service health with automatic restart capabilities
• Implement deep packet inspection for DTN protocol traffic where feasible
• Set up centralized logging for all ION-DTN nodes to correlate potential attack patterns
• Monitor system resource utilization on hosts running ION-DTN for signs of DoS conditions

How to Mitigate CVE-2024-54129

Immediate Actions Required

• Upgrade ION-DTN to version 4.1.3s or later immediately
• Implement network segmentation to limit exposure of ION-DTN services to trusted networks only
• Review and restrict which endpoints can send bundles to ION-DTN nodes
• Enable enhanced logging to capture any exploitation attempts during the patching window

Patch Information

This vulnerability is fixed in ION-DTN version 4.1.3s. Organizations running the affected version 4.1.3 should prioritize upgrading to the patched version. The fix addresses the improper initialization issue when processing bundles with imc scheme references in the Previous Node Block.

For patch details and upgrade instructions, refer to the GitHub Security Advisory.

Workarounds

• Implement network-level filtering to drop suspicious DTN bundles before they reach vulnerable ION-DTN nodes
• Deploy ION-DTN behind a reverse proxy or gateway that can perform bundle validation
• Limit network access to ION-DTN services to only trusted and authenticated endpoints
• Consider temporarily disabling imc scheme processing if not operationally required until patching is complete

# Configuration example - Network access restriction
# Restrict ION-DTN service access to trusted networks only
# Example iptables rules to limit access to ION-DTN ports
iptables -A INPUT -p udp --dport 4556 -s trusted_network/24 -j ACCEPT
iptables -A INPUT -p udp --dport 4556 -j DROP