# 5432,5433 - Pentesting Postgresql
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## **Basic Information**
**PostgreSQL** is an \_\*\*\_open source object-relational database system that uses and extends the SQL language.
**Default port:** 5432, and if this port is already in use it seems that postgresql will use the next port (5433 probably) which is not in use.
```
PORT STATE SERVICE
5432/tcp open pgsql
```
## Connect
```bash
psql -U # Open psql console with user
psql -h -U -d # Remote connection
psql -h -p -U -W # Remote connection
```
```sql
psql -h localhost -d -U #Password will be prompted
\list # List databases
\c # use the database
\d # List tables
\du+ # Get users roles
#Read a file
CREATE TABLE demo(t text);
COPY demo from '[FILENAME]';
SELECT * FROM demo;
#Write ascii to a file (copy to cannot copy binary data)
COPY (select convert_from(decode('','base64'),'utf-8')) to 'C:\\some\\interesting\path.cmd';
#List databases
SELECT datname FROM pg_database;
#Read credentials (usernames + pwd hash)
SELECT usename, passwd from pg_shadow;
#Check if current user is superiser
SELECT current_setting('is_superuser'); #If response is "on" then true, if "off" then false
#Check if plpgsql is enabled
SELECT lanname,lanacl FROM pg_language WHERE lanname = 'plpgsql'
#Change password
ALTER USER user_name WITH PASSWORD 'new_password';
#Check users privileges over a table (pg_shadow on this example)
SELECT grantee, privilege_type
FROM information_schema.role_table_grants
WHERE table_name='pg_shadow'
#Get users roles
SELECT
r.rolname,
r.rolsuper,
r.rolinherit,
r.rolcreaterole,
r.rolcreatedb,
r.rolcanlogin,
r.rolconnlimit, r.rolvaliduntil,
ARRAY(SELECT b.rolname
FROM pg_catalog.pg_auth_members m
JOIN pg_catalog.pg_roles b ON (m.roleid = b.oid)
WHERE m.member = r.oid) as memberof
, r.rolreplication
FROM pg_catalog.pg_roles r
ORDER BY 1;
```
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## Enumeration
```
msf> use auxiliary/scanner/postgres/postgres_version
msf> use auxiliary/scanner/postgres/postgres_dbname_flag_injection
```
### [**Brute force**](../generic-methodologies-and-resources/brute-force.md#postgresql)
Client authentication is controlled by a config file frequently named _**pg\_hba.conf**_. This file has a set of records. A record may have one of the following seven formats:
**Each** record **specifies** a **connection type**, a **client IP address range** (if relevant for the connection type), a **database name**, a **user name**, and the **authentication method** to be used for connections matching these parameters. The **first record with a match**ing connection type, client address, requested database, and user name **is used** to perform authentication. There is no "fall-through" or "backup": **if one record is chosen and the authentication fails, subsequent records are not considered**. If no record matches, access is denied.\
The **password-based** authentication methods are **md5**, **crypt**, and **password**. These methods operate similarly except for the way that the password is sent across the connection: respectively, MD5-hashed, crypt-encrypted, and clear-text. A limitation is that the crypt method does not work with passwords that have been encrypted in pg\_authid.
## **POST**
```
msf> use auxiliary/scanner/postgres/postgres_hashdump
msf> use auxiliary/scanner/postgres/postgres_schemadump
msf> use auxiliary/admin/postgres/postgres_readfile
msf> use exploit/linux/postgres/postgres_payload
msf> use exploit/windows/postgres/postgres_payload
```
### logging
Inside the _**postgresql.conf**_ file you can enable postgresql logs changing:
```bash
log_statement = 'all'
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
logging_collector = on
sudo service postgresql restart
#Find the logs in /var/lib/postgresql//main/log/
#or in /var/lib/postgresql//main/pg_log/
```
Then, **restart the service**.
### pgadmin
[pgadmin](https://www.pgadmin.org) is an administration and development platform for PostgreSQL.\
You can find **passwords** inside the _**pgadmin4.db**_ file\
You can decrypt them using the _**decrypt**_ function inside the script: [https://github.com/postgres/pgadmin4/blob/master/web/pgadmin/utils/crypto.py](https://github.com/postgres/pgadmin4/blob/master/web/pgadmin/utils/crypto.py)
```bash
sqlite3 pgadmin4.db ".schema"
sqlite3 pgadmin4.db "select * from user;"
sqlite3 pgadmin4.db "select * from server;"
string pgadmin4.db
```
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