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sif/modules/recon/memcached-unauth-exposure.yaml
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TigahandGitHub bf8c6a8643 feat(modules): add tcp module executor and recon modules (#308)
* feat(modules): tcp module executor

dial+probe+banner with word/regex/size matchers, ctx-honest watcher,
port required.

* feat(modules): add redis unauthenticated access tcp module

first shipped tcp module: sends INFO to redis (6379) and matches
redis_version in the reply, which an auth-required server never returns
(it answers -NOAUTH). extracts the leaked version.

* docs(modules): document the tcp module type

flip the http-only note and add a tcp config section (port, data,
word/regex/size matchers and regex extractors against the banner),
pointing at the redis demo module.

* feat(modules): support matchers-condition in tcp modules

tcp matchers were and-only; add the matchers-condition key (and default,
or) mirroring the http executor's checkMatchers, validated at load via the
shared validateMatchersCondition. documents the override in the combining
matchers section.

* feat(modules): decode escape sequences in tcp data payloads

decode C-style escapes (\\ \a \b \f \n \r \t \v \xHH) in a tcp module's
data value before it goes on the wire, so a single-quoted or plain yaml
scalar reaches the service with the same control bytes a double-quoted
one already would. an unrecognized escape is kept verbatim so no bytes
are silently lost.

* feat(modules): add tcp recon modules for common services

add five built-in tcp modules alongside the redis one so the executor
ships a real service set: memcached (unauth version probe), ssh and ftp
(passive banner version disclosure), mysql/mariadb (handshake exposure,
matched with matchers-condition: or across both auth plugin names), and
vnc (rfb handshake exposure). each fingerprint tracks the documented
on-wire protocol and pulls the version into an extractor.

* feat(modules): add mail and rsync tcp recon modules

add four more passive-banner tcp modules: smtp, pop3, and imap read the
greeting each mail service sends on connect (the smtp matcher requires
an esmtp/smtp marker so it does not fire on a bare 220 ftp greeting),
and rsync detects an exposed daemon by its @RSYNCD handshake. each pulls
the banner or protocol version into an extractor.
2026-07-22 12:49:22 -07:00

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YAML

# Memcached Unauthenticated Access Detection Module
id: memcached-unauth-exposure
info:
name: Memcached Unauthenticated Access
author: sif
severity: high
description: Detects a Memcached server that answers the version command without authentication, confirming unauthenticated access to the cache (a reachable memcached is also a known UDP/TCP reflection-amplification vector)
tags: [memcached, cache, database, tcp, unauth, exposure, recon]
type: tcp
tcp:
port: 11211
data: "version\r\n"
matchers:
- type: word
words:
- "VERSION "
extractors:
- type: regex
name: memcached_version
regex:
- "VERSION ([0-9.]+)"
group: 1