Horizon Alert
Summary of the vulnerability and why it matters
An issue has been identified in MongoDB's macOS TLS client implementation that could allow an attacker to intercept and modify encrypted traffic for outbound IPv6 connections. This vulnerability specifically affects MongoDB processes running on macOS utilizing the Apple SecureTransport TLS provider. The primary concern is confirming if this specific implementation is in use within your environment, as the potential impact depends on the network configuration and use of IPv6.
- Bypasses secure connections for specific IPv6 targets.
- Matters if using MongoDB on macOS with specific TLS settings.
- Confirm usage and exposure; no immediate widespread impact assumed.
Attack Path
How an attacker could exploit the issue
An attacker on the network could intercept encrypted traffic between a MongoDB process and its target if that process runs on macOS and connects to an IPv6 address. This is possible because the application's TLS client implementation on macOS silently ignores certificate validation errors for these specific outbound connections. An attacker could then present a fraudulent certificate to impersonate the intended recipient, enabling them to read or alter sensitive data transmitted over the connection.
- Network attacker presence required.
- Outbound IPv6 connections trigger vulnerability.
- Intercept and modify encrypted traffic.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could affect encrypted inter-node or external service traffic when MongoDB processes on macOS connect to IPv6-addressed peers. An attacker on the network path could present a malicious certificate to intercept and modify this traffic, as the client may silently discard trust evaluation results.
- Encrypted inter-node traffic at risk.
- On-path attacker can intercept traffic.
- Traffic modification and eavesdropping possible.
Operational Fix
Recommended remediation, mitigation, and detection steps
This critical vulnerability impacts MongoDB deployments on macOS using Apple's SecureTransport TLS backend for outbound IPv6 connections. Attackers can exploit this to intercept and modify traffic by presenting a forged certificate. The first practical move is to identify all macOS-based MongoDB instances, determine their IPv6 connectivity, and assess business criticality to prioritize remediation.
- Identify macOS MongoDB instances; assess IPv6 reachability.
- Confirm application and infrastructure ownership for action.
- Plan remediation considering identified risk and impact.
