Midv-056

# Debian/Ubuntu sudo apt-get update && sudo apt-get install midware=3.2.7

again to ensure the patch is active.

| Aspect | Description | |--------|-------------| | | The midware component uses a custom binary serialization format for inter‑process messages. The deserializer does not enforce strict type checking, allowing an attacker to inject serialized objects that invoke dangerous methods (e.g., java.lang.Runtime.exec() in Java‑based versions, or os.system() in Python‑based builds). | | Trigger Vector | A single HTTP POST to /api/v1/relay (or any endpoint that forwards raw payloads to the internal message bus). The payload must contain a maliciously crafted binary blob ( application/octet-stream ) that the server treats as a legitimate message. | | Prerequisites | No authentication required. The target must be running an unpatched version of midware (≤ 3.2.6) with default configuration (i.e., the message‑bus endpoint is exposed to the internet or reachable from the attacker’s network). | | Impact | • Remote code execution with system‑level privileges. • Ability to read/write any file accessible to the service account (including configuration files, SSH keys, and database credentials). • Potential pivoting to other services on the same host or network. | | Proof‑of‑Concept (PoC) | The official advisory provides a minimal PoC that consists of: 1. A binary payload generated with the midv-056‑gen.py script (available in the vendor’s GitHub advisory). 2. A curl command: bash<br>curl -X POST https://target.example.com/api/v1/relay \ <br> -H "Content-Type: application/octet-stream" \ <br> --data-binary @malicious_payload.bin<br> Important: Do not run this against production systems without explicit authorization. | | Detection | • Look for anomalous POST requests to /api/v1/relay with unusually large Content‑Length headers. • IDS/IPS signatures: Snort rule SID 2024001 and Suricata rule midv056 . • Application logs may show deserialization errors ( Invalid class name or ClassCastException ) right before a crash or restart. | | Mitigation | • Upgrade to midware 3.2.7 or later (the patch replaces the unsafe deserializer with a whitelist‑based JSON parser). • If upgrade is not possible, disable the vulnerable endpoint or restrict it to trusted IPs via a firewall or reverse‑proxy ACL. • Enable strict input validation on the web server (e.g., reject Content‑Type: application/octet-stream unless required). • Run the service under a non‑privileged account and apply least‑privilege file‑system permissions. | | Remediation Timeline | • Short‑term – Block the endpoint, add IDS signatures, and monitor logs. • Medium‑term – Apply vendor patch or back‑port the deserialization fix. • Long‑term – Adopt a secure serialization format (e.g., JSON Schema or Protocol Buffers) and enforce schema validation. | midv-056

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to load the new binary: