Related Vulnerabilities: CVE-2018-3652

Intel platforms, starting with Skylake, support a USB 3-based debugging interface (a.k.a. Direct Connect Interface or DCI), which, if enabled, allows inspection/modification of hardware configuration and memory. There is an existing UEFI setting restriction for DCI (Direct Connect Interface) in 5th and 6th generation Intel® Xeon® Processor E3 Family, Intel® Xeon® Scalable processors, and Intel® Xeon® Processor D Family, which allows a limited physical presence attacker to access platform secrets via debug interfaces. This vulnerability potentially affects platforms using the following processors: Intel® Xeon® Scalable processors Intel® Xeon® Processor E3 v6 Family (Kaby Lake) Intel® Xeon® Processor E3 v5 Family (Skylake) Intel® Xeon® Processor D Family (Skylake-D) Potentially affected products are not subject to this vulnerability if any of the following is true: EFI Secure Boot is enabled: This prevents the loading of malicious option ROMs. This also assumes the DCI Control setup field is equally protected. Boot Guard is enabled: Settings limit enabling of DCI capabilities. User Control through a UEFI variable has been disconnected from DCI Policy AND the DCI Policy has been set to disabled: This eliminates the ability to enable the DCI.

Source

Potential Security Impact:

Information disclosure and escalation of privilege via limited physical presence.

Source: HP, HP Product Security Response Team (PSRT)

Reported by: Intel

VULNERABILITY SUMMARY

There is an existing UEFI setting restriction for DCI (Direct Connect Interface) in 5th and 6th generation Intel® Xeon® Processor E3 Family, Intel® Xeon® Scalable processors, and Intel® Xeon® Processor D Family, which allows a limited physical presence attacker to access platform secrets via debug interfaces.

This vulnerability potentially affects platforms using the following processors:

Intel® Xeon® Scalable processors
Intel® Xeon® Processor E3 v6 Family (Kaby Lake)
Intel® Xeon® Processor E3 v5 Family (Skylake)
Intel® Xeon® Processor D Family (Skylake-D)

Potentially affected products are not subject to this vulnerability if any of the following is true:

EFI Secure Boot is enabled: This prevents the loading of malicious option ROMs. This also assumes the DCI Control setup field is equally protected.
Boot Guard is enabled: Settings limit enabling of DCI capabilities.
User Control through a UEFI variable has been disconnected from DCI Policy AND the DCI Policy has been set to disabled: This eliminates the ability to enable the DCI.

Reference Number

CVE-2018-3652, PSR-2018-0141

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.

N/A

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-2018-3652	CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	7.3

RESOLUTION

HPI has reviewed its potentially affected systems and has determined that, as shipped, these systems have at least one of the mitigating settings listed above and are, therefore, not exposed to this issue. Specifically, DCI support has been removed, which means user control through a UEFI variable has been disconnected from DCI policy, and the DCI policy has been disabled. There are no user accessible settings to enable DCI.

...

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 http://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://h41369.www4.hp.com/alerts-signup.php?lang=en&cc=US&jumpid=hpsc_profile.

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:

To: hp-security-alert@hp.com

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: 9 July 2018 Initial release.

SUPPORT COMMUNICATION- SECURITY BULLETIN HPSBHF03586 rev. 1 - DCI Policy Update

Vulmon Search

About

Products

Connect