> For the complete documentation index, see [llms.txt](https://blogs.cracksoft.in/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blogs.cracksoft.in/problems/install-oracle-database-on-kali-linux.md).

# Install Oracle Database on Kali Linux

<figure><img src="/files/3RO1XjBxO5PDUz3hu5xM" alt=""><figcaption></figcaption></figure>

There’s a thrill in making software fit where it wasn’t designed. Picture yourself: a powerful penetration tester running enterprise-grade Oracle on Kali Linux, all within a single system. That’s what you’re about to achieve.

Oracle XE 21c comes as an `.rpm` from Oracle Linux or Red Hat environments. Kali, being Debian-based, uses `.deb`, so—naturally—we need to bridge that gap.

#### Setting the Stage: System Prep and Prerequisites

Open your terminal, take a deep breath, and start with:

```bash
sudo apt update
sudo apt full-upgrade -y
```

This ensures your system has the latest packages, patches, and compatible libraries. Think of it as calibrating your tools before the build.

Next, install the essential tools and dependencies:

```bash
sudo apt install alien libaio1 libaio-dev unixodbc net-tools lsb-rpm libnsl2 -y
```

Each package plays a critical role:

* `alien`: converts the `.rpm` into a `.deb`, essential for Debian compatibility.
* `libaio1`/`libaio-dev`: allows asynchronous IO, used heavily by Oracle for performance.
* `unixodbc`, `net-tools`, `lsb-rpm`, `libnsl2`: support networking, OS binds, and package inspection.

Without these, keepers of Oracle’s magic, the installation will falter.

***

#### Retrieving the Oracle RPM

Head to Oracle’s official download page, log in or create an account, and download:

```
oracle-database-xe-21c-1.0-1.ol7.x86_64.rpm
```

Save it in your home or Downloads folder. This `.rpm` file is our raw material.

***

#### Transforming `.RPM` into `.DEB`

Switch to the directory containing the RPM, and execute:

```bash
cd ~/Downloads
sudo alien -d --scripts oracle-database-xe-21c-1.0-1.ol7.x86_64.rpm
```

This script turns it into:

```
oracle-database-xe-21c_1.0-2_amd64.deb
```

Be patient—this can take several minutes. You’re rewrapping Oracle in Debian format, effectively telling Kali you’re serious.

***

#### Installing Oracle XE on Kali

Now install the newly created `.deb`:

```bash
sudo dpkg -i oracle-database-xe-21c_1.0-2_amd64.deb
```

If you encounter dependency errors, resolve them with:

```bash
sudo apt --fix-broken install
sudo dpkg -i oracle-database-xe-21c_1.0-2_amd64.deb
```

At this point, Oracle XE is installed—but not yet running.

***

#### Bringing Oracle to Life: Configuration

Run the built-in configuration script:

```bash
sudo /etc/init.d/oracle-xe-21c configure
```

You’ll be prompted to:

1. Enter a password for SYS, SYSTEM, PDBADMIN (you might use something like `cracksoft`).
2. Choose a listener port—default 1521 is fine.
3. Decide whether to auto-start XE with the system.
4. Let configuration run—it may take several minutes.

Under the hood, this script:

* Configures the listener via `listener.ora`.
* Initializes the root container and a pluggable database (`XEPDB1`).
* Sets environment variables and system service entries.

***

#### Ensuring Oracle Starts Clean

After config completes, start the service:

```bash
sudo systemctl start oracle-xe-21c
sudo systemctl enable oracle-xe-21c
```

Check listener status:

```bash
lsnrctl status
```

You should see output like:

> Service "XE" has 1 instance(s), Service "XEPDB1" has 1 instance(s) … ([mikedietrichde.com](https://mikedietrichde.com/2021/09/22/oracle-database-21c-xe-express-edition-for-linux/?utm_source=chatgpt.com), [stackoverflow.com](https://stackoverflow.com/questions/73241024/oracle-xe-21c-listener-wont-start?utm_source=chatgpt.com), [oracle.com](https://www.oracle.com/linux/technologies/articles/xe-on-kubuntu.html?utm_source=chatgpt.com), [docs.oracle.com](https://docs.oracle.com/en/database/oracle/oracle-database/21/xeinw/connecting-oracle-database-xe.html?utm_source=chatgpt.com), [youtube.com](https://www.youtube.com/watch?v=SQ0C1Xg7p7A\&utm_source=chatgpt.com))

If errors appear (`TNS-12560`, permission denied), it might be due to missing `$ORACLE_HOME/lib`, incorrect script permissions on `/opt/oracle/...`, or missing groups like `dba`. Use `sudo groupadd dba` and re-add your user to that group, then restart.

***

#### Connecting to Your Database

Set environment variables, typically in `~/.bashrc`:

```bash
export ORACLE_SID=XE
export ORACLE_HOME=/opt/oracle/product/21c/dbhomeXE
export PATH=$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib
```

Reload with:

```bash
source ~/.bashrc
```

Then, connect via SQL\*Plus:

```bash
sqlplus sys@localhost:1521/XEPDB1 as sysdba
```

This uses the Easy Connect syntax, specifying the pluggable database `XEPDB1` ([stackoverflow.com](https://stackoverflow.com/questions/73241024/oracle-xe-21c-listener-wont-start?utm_source=chatgpt.com), [docs.oracle.com](https://docs.oracle.com/en/database/oracle/oracle-database/21/xeinw/connecting-oracle-database-xe.html?utm_source=chatgpt.com)).

***

#### Understanding Oracle's Network Config Files

Oracle uses:

* `listener.ora` (server listener settings)
* `tnsnames.ora` (client connection aliases)
* `sqlnet.ora` (client connection order preferences) ([oracle-base.com](https://oracle-base.com/articles/misc/oracle-network-configuration?utm_source=chatgpt.com))

Oracle XE's network directory is typically in a read-only `homes/<unique_home>` subfolder. After install, ensure listener binds to your host:

Edit:

```bash
sudo nano $ORACLE_HOME/network/admin/listener.ora
```

Change `HOST = localhost` to either `0.0.0.0` (listen on all interfaces) or your Kali IP, then reload:

```bash
lsnrctl stop
lsnrctl start
```

This enables remote connections ([oracle-base.com](https://oracle-base.com/articles/misc/oracle-network-configuration?utm_source=chatgpt.com), [gist.github.com](https://gist.github.com/jniltinho/327266096f9a4e6169a806c09e10a039?utm_source=chatgpt.com)).

***

#### Accessing Oracle Remotely and via GUI

You can now connect with tools such as DBeaver or SQL Developer. Easy Connect string:

```
system@<kali-ip>:1521/XEPDB1
```

Inside SQL Developer or DBeaver, use that for host/port/service name ([docs.oracle.com](https://docs.oracle.com/en/database/oracle/oracle-database/21/xeinw/connecting-oracle-database-xe.html?utm_source=chatgpt.com)).

Optionally, add a `tnsnames.ora` entry:

```
XEPDB1 =
 (DESCRIPTION =
   (ADDRESS = (PROTOCOL = TCP)(HOST = <kali-ip>)(PORT = 1521))
   (CONNECT_DATA = (SERVICE_NAME = XEPDB1))
 )
```

***

#### Backup, Shutdown, and Uninstall Paths

To stop entirely:

```bash
sudo systemctl stop oracle-xe-21c
```

Backup a database with:

```bash
expdp system/cracksoft DIRECTORY=DATA_PUMP_DIR DUMPFILE=exp.dmp FULL=Y
```

To uninstall everything:

```bash
sudo systemctl stop oracle-xe-21c
sudo dpkg --purge oracle-database-xe-21c
sudo rm -rf /opt/oracle
sudo rm /etc/init.d/oracle-xe-21c
```

***

#### Pro Tips & Troubleshooting

* If dependencies aren’t found, installing `alien` from source or enabling nonfree/unstable repos may help ([oracle-base.com](https://oracle-base.com/articles/misc/oracle-network-configuration?utm_source=chatgpt.com), [oracle.com](https://www.oracle.com/linux/technologies/articles/xe-on-kubuntu.html?utm_source=chatgpt.com)).
* Listener errors (`TNS-12560`, missing message strings) often stem from incorrect `$ORACLE_HOME/lib` or missing READ/EXEC permissions ([stackoverflow.com](https://stackoverflow.com/questions/73241024/oracle-xe-21c-listener-wont-start?utm_source=chatgpt.com)).
* Want to experiment with multiple PDBs? Use Oracle’s `CREATE PLUGGABLE DATABASE` and edit TNS entries accordingly.

***

#### Final Reflections

With Oracle XE 21c running on Kali, you’re equipped to:

* Test Oracle-specific injections and stored procedure issues.
* Explore security misconfigurations and mimic enterprise setups.
* Use Oracle tools (SQL\*Plus, Data Pump, ODAC) natively.

You’ve bridged a distro divide, rewrote package formats, configured full database services, and opened network access. All within a pentesting environment. That’s the kind of flexibility that makes Kali more than a toolkit—it makes it a canvas.


---

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