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Category:   Application (Generic)  >   HPE integrated Lights Out (iLO) Vendors:   HPE
HP integrated Lights Out (iLO) TLS Diffie-Hellman Export Cipher Downgrade Attack Lets Remote Users Decrypt Connections
SecurityTracker Alert ID:  1034884
SecurityTracker URL:
CVE Reference:   CVE-2015-4000   (Links to External Site)
Updated:  Apr 5 2018
Original Entry Date:  Jan 29 2016
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): iLO 2 2.32, iLO 3 1.85, iLO 4 2.22; and prior versions
Description:   A vulnerability was reported in HP integrated Lights Out (iLO). A remote user may be able to decrypt TLS connections in certain situations.

A remote user that can conduct a man-in-the-middle attack can cause the target system to downgrade the Diffie-Hellman algorithm to 512-bit export-grade cryptography. The remote user may then be able to decrypt the connection.

This vulnerability resides in the TLS protocol and not in the specific TLS implementation, but the vulnerability is exposed because the target system supports export-grade ciphers.

This attack is known as the "Logjam" attack.

The original advisory is available at:

David Adrian, Karthikeyan Bhargavan, Zakir Durumeric, Pierrick Gaudry, Matthew Green, J. Alex Halderman, Nadia Heninger, Drew Springall, Emmanuel Thome, Luke Valenta, Benjamin VanderSloot, Eric Wustrow, Santiago Zanella-Beguelin, and Paul Zimmermann reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can cause the target system to use weak cryptography that can be decrypted.
Solution:   The vendor has issued a fix (iLO 2 2.29, iLO 3 1.87, iLO 4 2.30).

The vendor's advisory is available at:

[Editor's note: On April 4, 2018, the vendor issued a revised fix (2.33) for iLO 2, described in bulletin HPESBHF03831. The vendor advisory is available at:]

Vendor URL: (Links to External Site)
Cause:   Authentication error

Message History:   None.

 Source Message Contents

Subject:  [security bulletin] HPSBHF03510 rev.1 - HP Integrated Lights-Out 2/3/4, Remote Unauthorized Modification

Hash: SHA1


Document ID: c04949778
Version: 1

HPSBHF03510 rev.1 - HP Integrated Lights-Out 2/3/4, Remote Unauthorized

NOTICE: The information in this Security Bulletin should be acted upon as
soon as possible.

Release Date: 2016-01-27
Last Updated: 2016-01-27

Potential Security Impact: Remote Unauthorized Modification

Source: Hewlett Packard Enterprise, Product Security Response Team

A potential security vulnerability has been identified in HP Integrated
Lights Out 2/3/4.

The TLS vulnerability using US export-grade 512-bit keys in Diffie-Hellman
key exchange known as "Logjam" could be exploited remotely to allow
unauthorized modification. Unlike the TLS server-side version of Logjam, this
vulnerability affects the client-side TLS connection on iLO, or when the iLO
acts as a client in a client-server connection.



SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.

iLO 2 2.28 and earlier
iLO 3 1.85 and earlier
iLO 4 2.22 and earlier


CVSS 2.0 Base Metrics
  Reference              Base Vector             Base Score
CVE-2015-4000    (AV:N/AC:M/Au:N/C:N/I:P/A:N)       4.3
             Information on CVSS is documented
            in HP Customer Notice: HPSN-2008-002


HP has provided firmware updates for this vulnerability in iLO 2 version
2.29, iLO 3 version 1.87 and iLO 4 version 2.30. The updates are available at
the following location:

For iLO 3 1.87 firmware, please download the updates from the following ftp

Online ROM Flash Component for Windows x86:

Online ROM Flash Component for Windows x64:

Online ROM Flash Component for VMware ESXi:

Online ROM Flash Component for Linux:

Version:1 (rev.1) - 26 January 2016 Initial release

Third Party Security Patches: Third party security patches that are to be
installed on systems running Hewlett Packard Enterprise (HPE) software
products should be applied in accordance with the customer's patch management

Support: For issues about implementing the recommendations of this Security
Bulletin, contact normal HPE Services support channel. For other issues about
the content of this Security Bulletin, send e-mail to

Report: To report a potential security vulnerability with any HPE supported
product, send Email to:

Subscribe: To initiate a subscription to receive future HPE Security Bulletin
alerts via Email:

Security Bulletin Archive: A list of recently released Security Bulletins is
available here:

Software Product Category: The Software Product Category is represented in
the title by the two characters following HPSB.

3C = 3COM
3P = 3rd Party Software
GN = HPE General Software
HF = HPE Hardware and Firmware
MU = Multi-Platform Software
NS = NonStop Servers
OV = OpenVMS
PV = ProCurve
ST = Storage Software

Copyright 2016 Hewlett Packard Enterprise

Hewlett Packard Enterprise shall not be liable for technical or editorial
errors or omissions contained herein. The information provided is provided
"as is" without warranty of any kind. To the extent permitted by law, neither
HP or its affiliates, subcontractors or suppliers will be liable for
incidental,special or consequential damages including downtime cost; lost
profits; damages relating to the procurement of substitute products or
services; or damages for loss of data, or software restoration. The
information in this document is subject to change without notice. Hewlett
Packard Enterprise and the names of Hewlett Packard Enterprise products
referenced herein are trademarks of Hewlett Packard Enterprise in the United
States and other countries. Other product and company names mentioned herein
may be trademarks of their respective owners.

Version: GnuPG v1


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