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SUPPORT COMMUNICATION- SECURITY BULLETIN

Document ID: c06549501

Version: 2

HPSBHF03647 rev. 2 - HP Open-Chassis Pre-boot Direct Memory Access (DMA) Vulnerability

Notice:: The information in this security bulletin should be acted upon as soon as possible.

Release date : 30-Jan-2020

Last updated : 03-Mar-2020

Potential Security Impact:
Arbitrary Code Execution, Denial of Service, Information Disclosure.
Source: HP, HP Product Security Response Team (PSRT).
Reported by: Mickey Shkatov from Eclypsium, and Zoltan Harmath from Microsoft.

VULNERABILITY SUMMARY
A potential security vulnerability with pre-boot DMA may allow unauthorized UEFI code execution using open-case attacks. This industry-wide issue requires physically accessing internal expansion slots inside a computer with specialized hardware and software tools to modify UEFI code in memory.
Reference Number
CVE-2019-18913, PSR-2019-0095, PSR-2019-0163
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
See RESOLUTION section for impacted products.
BACKGROUND
For a PGP signed version of this security bulletin please write to: hp-security-alert@hp.com.
CVSS 3.0 Base Metrics
Reference
Base Vector
Base Score
CVE-2019-18913
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.1
RESOLUTION
HP is making BIOS mitigations available for Intel-based Business PCs that support Microsoft Windows 10 Kernel DMA protection, extending the industry standard pre-boot DMA protection against Thunderbolt-port based attacks to protections against attacks mounted through internal PCI Express slots inside the computer. See the list below for mitigated platforms and available BIOS SoftPaq updates.
After performing the BIOS update, the 'Pre-boot DMA Protection' BIOS setting must be configured to enable the protection.
Additional information on DMA attack mitigations can be found in the HP technical white paper Thunderbolt™ 3 DMA Attack Mitigations.
For customers concerned about open-chassis attacks where the attacker has physical access inside the computer, HP recommends customers use adequate physical security controls to ensure an attacker cannot obtain access to, disassemble, or modify their devices. Although HP is releasing a BIOS update to add a mitigation for this specific open-chassis attack for those platforms that support modern IOMMU based protection from DMA attacks, be aware that an attacker with physical access and the ability to modify the hardware has a very large attack surface to work with that extends beyond this specific DMA attack possibility. For that reason, physical security for the device is recommended even in situations where the BIOS mitigation is deployed.
HP has identified the affected platforms and the corresponding SoftPaq updated versions. See the affected platforms listed below.
note:
HP recommends keeping your system up to date with the latest firmware, drivers, and software.
Sign up for HP Subscriptions and get notifications for:
  • Product support eAlerts
  • Driver updates
  • Security bulletin updates

Enabling Pre-boot DMA Protection

For platforms that support the updated solution, configure 'Pre-boot DMA protection' to one of the following options to enable the protection:
  1. Turn on or restart the computer.
  2. While the display is blank, press the f10 key to enter the BIOS setting menu.
  3. Select Advanced, and then select the System Options menu.
  4. Click Pre-boot DMA protection and make configuration changes to one of the following, depending on your platform’s support for Thunderbolt:
    • Thunderbolt and PCIe expansion card for systems that include Thunderbolt support.
    • PCIe expansion card for systems that do not support Thunderbolt.
    • All PCI Devices for the newer product generations with this option.
  5. Save the changes and exit.

Business PCs

Product Name
Updated Version
SoftPaq #
SoftPaq Link
HP EliteDesk 800 G5 DM
02.04.02
SP101126
HP EliteDesk 800 G5 SFF
02.04.02
SP101143
HP EliteDesk 800 G5 TWR
02.04.02
SP101143
HP EliteOne 800 G5 AIO
02.04.02
SP101120
HP ProDesk 400 G5 DM
02.04.01
SP101128
HP ProDesk 400 G6 MT
02.04.01
SP101145
HP ProDesk 400 G6 SFF
02.04.02
SP101148
HP ProDesk 480 G6 MT
02.04.01
SP101145
HP ProDesk 600 G5 DM
02.04.01
SP101127
HP ProDesk 600 G5 MT
02.04.01
SP101144
HP ProDesk 600 G5 PCI MT
02.04.01
SP101144
HP ProDesk 600 G5 SFF
02.04.01
SP101255
HP ProOne 400 G5 AiO
02.04.01
SP101174
HP ProOne 440 G5 AiO
02.04.01
SP101174
HP ProOne 600 G5 AiO
02.04.01
SP101174
HP Elite Dragonfly
01.04.02
SP101295
HP Elite x2 G4
01.04.02
SP101379
HP EliteBook 830 G6
01.04.02
SP101245
HP EliteBook 836 G6
01.04.02
SP101245
HP EliteBook 840 G6
01.04.02
SP101245
HP EliteBook 840 G6 Healthcare Edition
01.04.02
SP101245
HP EliteBook 846 G6
01.04.02
SP101245
HP EliteBook 846 G6 Healthcare Edition
01.04.02
SP101245
HP EliteBook 850 G6
01.04.02
SP101245
HP EliteBook x360 1030 G4
01.04.02
SP101274
HP EliteBook x360 1040 G6
01.04.02
SP101318
HP EliteBook x360 830 G6
01.04.02
SP101247
HP ProBook 640 G5
01.04.02
SP101246
HP ProBook 650 G5
01.04.02
SP101246
HP ZBook 14u G6 Mobile Workstation
01.04.02
SP101245
HP ZBook 15 G6 Mobile Workstation
01.04.05
SP101734
HP ZBook 15u G6 Mobile Workstation
01.04.02
SP101245
HP ZBook 17 G6 Mobile Workstation
01.04.05
SP101734
HP ZHAN X 13 G2
01.04.02
SP101248
Third Party Security Patches: Third party security patches that are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy.
Support: For issues about implementing the recommendations of this Security Bulletin, visit https://www.hp.com/go/contacthp to learn about your HP support options.
Report: To report a potential security vulnerability with any HP supported product, send email to: hp-security-alert@hp.com.
Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via email, visit https://www.hp.com/go/alerts.
Security Bulletin Archive: To view released Security Bulletins, search the HP Support Site for "security bulletin".
Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.
PI
HP Printing and Imaging
HF
HP Hardware and Firmware
GN
HP General Software
It is strongly recommended that security related information being communicated to HP be encrypted using PGP, especially exploit information.
To get the security-alert PGP key, please send an e-mail message as follows:
Subject: get key
System management and security procedures must be reviewed frequently to maintain system integrity. HP is continually reviewing and enhancing the security features of software products to provide customers with current secure solutions.

"HP is broadly distributing this Security Bulletin in order to bring to the attention of users of the affected HP products the important security information contained in this Bulletin.HP recommends that all users determine the applicability of this information to their individual situations and take appropriate action.HP does not warrant that this information is necessarily accurate or complete for all user situations and, consequently, HP will not be responsible for any damages resulting from user's use or disregard of the information provided in this Bulletin.To the extent permitted by law, HP disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose, title and non-infringement."
REVISION HISTORY : Version: 1 - 30 January 2020 Initial release. Version: 2 - 3 February 2020 Modified description to clarify attacker would need access “physical access inside the computer”, adjusted CVE vector and score for physical access, and added SoftPaq information for HP ZBook 15 G6 and 17 G6 models.

HP Inc. 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 restorationThe information in this document is subject to change without notice.HP Inc. and the names of HP products referenced herein are trademarks of HP Inc. in the United States and other countries.Other product and company names mentioned herein may be trademarks of their respective owners.

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