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127 lines
4.6 KiB
Markdown
127 lines
4.6 KiB
Markdown
# 5432,5433 - Pentesting Postgresql
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## **Basic Information**
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**PostgreSQL** is an _\*\*_open source object-relational database system that uses and extends the SQL language.
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**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.
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```
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PORT STATE SERVICE
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5432/tcp open pgsql
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```
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## Connect
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```bash
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psql -U <myuser> # Open psql console with user
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psql -h <host> -U <username> -d <database> # Remote connection
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psql -h <host> -p <port> -U <username> -W <password> <database> # Remote connection
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```
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```sql
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psql -h localhost -d <database_name> -U <User> #Password will be prompted
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\list # List databases
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\c <database> # use the database
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\d # List tables
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\du+ # Get users roles
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#Read a file
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CREATE TABLE demo(t text);
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COPY demo from '[FILENAME]';
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SELECT * FROM demo;
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#Write ascii to a file (copy to cannot copy binary data)
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COPY (select convert_from(decode('<B64 payload>','base64'),'utf-8')) to 'C:\\some\\interesting\path.cmd';
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#List databases
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SELECT datname FROM pg_database;
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#Read credentials (usernames + pwd hash)
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SELECT usename, passwd from pg_shadow;
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#Check if current user is superiser
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SELECT current_setting('is_superuser'); #If response is "on" then true, if "off" then false
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#Check if plpgsql is enabled
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SELECT lanname,lanacl FROM pg_language WHERE lanname = 'plpgsql'
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#Change password
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ALTER USER user_name WITH PASSWORD 'new_password';
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#Check users privileges over a table (pg_shadow on this example)
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SELECT grantee, privilege_type
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FROM information_schema.role_table_grants
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WHERE table_name='pg_shadow'
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#Get users roles
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SELECT
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r.rolname,
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r.rolsuper,
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r.rolinherit,
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r.rolcreaterole,
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r.rolcreatedb,
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r.rolcanlogin,
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r.rolconnlimit, r.rolvaliduntil,
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ARRAY(SELECT b.rolname
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FROM pg_catalog.pg_auth_members m
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JOIN pg_catalog.pg_roles b ON (m.roleid = b.oid)
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WHERE m.member = r.oid) as memberof
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, r.rolreplication
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FROM pg_catalog.pg_roles r
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ORDER BY 1;
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```
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## Enumeration
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```
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msf> use auxiliary/scanner/postgres/postgres_version
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msf> use auxiliary/scanner/postgres/postgres_dbname_flag_injection
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```
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### [**Brute force**](../brute-force.md#postgresql)
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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:
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**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.\
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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.
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## **POST**
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```
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msf> use auxiliary/scanner/postgres/postgres_hashdump
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msf> use auxiliary/scanner/postgres/postgres_schemadump
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msf> use auxiliary/admin/postgres/postgres_readfile
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msf> use exploit/linux/postgres/postgres_payload
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msf> use exploit/windows/postgres/postgres_payload
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```
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### logging
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Inside the _**postgresql.conf**_ file you can enable postgresql logs changing:
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```bash
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log_statement = 'all'
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log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
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logging_collector = on
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sudo service postgresql restart
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#Find the logs in /var/lib/postgresql/<PG_Version>/main/log/
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#or in /var/lib/postgresql/<PG_Version>/main/pg_log/
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```
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Then, **restart the service**.
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### pgadmin
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[pgadmin](https://www.pgadmin.org) is an administration and development platform for PostgreSQL.\
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You can find **passwords** inside the _**pgadmin4.db**_ file\
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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)
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```bash
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sqlite3 pgadmin4.db ".schema"
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sqlite3 pgadmin4.db "select * from user;"
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sqlite3 pgadmin4.db "select * from server;"
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string pgadmin4.db
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```
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