Bug 1581650 (CVE-2018-3693) - CVE-2018-3693 Kernel: speculative bounds check bypass store
Summary: CVE-2018-3693 Kernel: speculative bounds check bypass store
Status: CLOSED ERRATA
Alias: CVE-2018-3693
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=important,public=20180710:1700...
Keywords: Security
Depends On: 1590094 1590098 1590099 1589032 1589033 1589034 1589035 1589036 1589037 1590090 1590091 1590092 1590093 1590095 1590096 1590097 1590100 1599832 1599833
Blocks: 1581208 1595197 1595198 1595199 1595200
TreeView+ depends on / blocked
 
Reported: 2018-05-23 10:00 UTC by Prasad J Pandit
Modified: 2019-05-16 08:21 UTC (History)
57 users (show)

(edit)
An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.
Clone Of:
(edit)
Last Closed: 2018-11-21 11:27:31 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2384 None None None 2018-08-14 18:44 UTC
Red Hat Product Errata RHSA-2018:2390 None None None 2018-08-14 18:26 UTC
Red Hat Product Errata RHSA-2018:2395 None None None 2018-08-14 20:24 UTC

Description Prasad J Pandit 2018-05-23 10:00:19 UTC
An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check.

It relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire).

As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.

Comment 3 Prasad J Pandit 2018-06-19 09:24:48 UTC
Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 may address this issue.

Comment 6 Prasad J Pandit 2018-07-10 09:53:35 UTC
Acknowledgments:

Name: Vladimir Kiriansky (MIT), Carl Waldspurger (Carl Waldspurger Consulting)

Comment 7 Prasad J Pandit 2018-07-10 17:08:31 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1599832]

Comment 10 errata-xmlrpc 2018-08-14 18:26:03 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:2390 https://access.redhat.com/errata/RHSA-2018:2390

Comment 11 errata-xmlrpc 2018-08-14 18:44:32 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2384 https://access.redhat.com/errata/RHSA-2018:2384

Comment 12 errata-xmlrpc 2018-08-14 20:24:08 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2395 https://access.redhat.com/errata/RHSA-2018:2395

Comment 13 Justin M. Forbes 2018-08-20 17:17:34 UTC
The kernel portion has been addressed with kernel-4.17.15 across all fedora stable releases.


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