Pierluigi Paganini May 02, 2017

A critical remote code execution vulnerability tracked as CVE-2017-5689 in Intel Management Engine affects Intel enterprise PCs dates back 9 years.

A critical remote code execution (RCE) vulnerability tracked as CVE-2017-5689 has been discovered in the remote management features implemented on computers shipped with Intel Chipset in past 9 years.

The vulnerability affects the Intel Management Engine (ME) technologies such as Active Management Technology (AMT), Small Business Technology (SBT), and Intel Standard Manageability (ISM) and could be exploited by hackers to remotely take over the vulnerable systems.

The remote management features allow system administrators to remotely manage computers over an enterprise network. Such kind of features are implemented only in enterprise solutions and doesn’t affect chips running on Intel-based consumer PCs.

“There is an escalation of privilege vulnerability in Intel® Active Management Technology (AMT), Intel® Standard Manageability (ISM), and Intel® Small Business Technology versions firmware versions 6.x, 7.x, 8.x 9.x, 10.x, 11.0, 11.5, and 11.6 that can allow an unprivileged attacker to gain control of the manageability features provided by these products.  This vulnerability does not exist on Intel-based consumer PCs. ” reads the advisory published by Intel.

The vulnerability rated by Intel as highly critical, could be exploited in two ways:

1. An unprivileged network attacker could gain system privileges to provisioned Intel manageability SKUs: Intel® Active Management Technology (AMT) and Intel® Standard Manageability (ISM).
   • CVSSv3 9.8 Critical /AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2. An unprivileged local attacker could provision manageability features gaining unprivileged network or local system privileges on Intel manageability SKUs: Intel® Active Management Technology (AMT), Intel® Standard Manageability (ISM), and Intel® Small Business Technology (SBT).
   • CVSSv3 8.4 High /AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

An attacker can exploit the vulnerability to remotely access the vulnerable machine and perform in a stealth way malicious activities, including to deliver a malware.

The flaw was first reported in March by the security expert Maksim Malyutin of Embedi.

These flawed remote management features have been implemented in many Intel chipsets for nine years, starting from Nehalem Core i7 in 2008. Modern Apple Macs do not ship with the AMT software, so they are not affected.

This kind of flaw is very insidious because any countermeasure implemented at the operating system level is not able to detect malicious operation because AMT has direct access to the computer’s network hardware. Malicious traffic is routed directly to the Management Engine and passed on to AMT, but the local OS never sees it.

According to Intel, the remote code execution vulnerability affects Intel manageability firmware versions 6.x, 7.x, 8.x 9.x, 10.x, 11.0, 11.5, and 11.6 for Intel’s AMT, ISM, and SBT platforms. Versions before 6 or after 11.6 are not impacted.