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# Protocol Information
**Memcached** (pronunciation: mem-cashed, mem-cash-dee) is a general-purpose distributed [memory caching](https://en.wikipedia.org/wiki/Memory\_caching) system. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce the number of times an external data source (such as a database or API) must be read. (From [wikipedia](https://en.wikipedia.org/wiki/Memcached))\
Although Memcached supports SASL, most instances are **exposed without authentication**.
**Default port:** 11211
```
PORT STATE SERVICE
11211/tcp open unknown
```
# Enumeration
## Manual
To ex-filtrate all the information saved inside a memcache instance you need to:
1. Find **slabs** with **active items**
2. Get the **key names** of the slabs detected before
3. Ex-filtrate the **saved data** by **getting the key names**
Remember that this service is just a **cache**, so **data may be appearing and disappearing**.
```bash
echo "version" | nc -vn -w 1 11211 #Get version
echo "stats" | nc -vn -w 1 11211 #Get status
echo "stats slabs" | nc -vn -w 1 11211 #Get slabs
echo "stats items" | nc -vn -w 1 11211 #Get items of slabs with info
echo "stats cachedump 0" | nc -vn -w 1 11211 #Get key names (the 0 is for unlimited output size)
echo "get " | nc -vn -w 1 11211 #Get saved info
#This php will just dump the keys, you need to use "get later"
sudo apt-get install php-memcached
php -r '$c = new Memcached(); $c->addServer("localhost", 11211); var_dump( $c->getAllKeys() );'
```
## Manual2
```bash
sudo apt install libmemcached-tools
memcstat --servers=127.0.0.1 #Get stats
memcdump --servers=127.0.0.1 #Get all items
memccat --servers=127.0.0.1 #Get info inside the item(s)
```
## Automatic
```bash
nmap -n -sV --script memcached-info -p 11211 #Just gather info
msf > use auxiliary/gather/memcached_extractor #Extracts saved data
msf > use auxiliary/scanner/memcached/memcached_amp #Check is UDP DDoS amplification attack is possible
```
## **Shodan**
* `port:11211 "STAT pid"`
* `"STAT pid"`
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