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AUSCERT External Security Bulletin Redistribution
ESB-2018.2500
L1 Terminal Fault (L1TF) Kernel Information Disclosure
23 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: FreeBSD kernel
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-3646 CVE-2018-3620
Reference: ESB-2018.2487
ESB-2018.2457
ESB-2018.2441
ESB-2018.2439
ESB-2018.2437
Original Bulletin:
http://www.vuxml.org/freebsd/2310b814-a652-11e8-805b-a4badb2f4699.html
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FreeBSD -- L1 Terminal Fault (L1TF) Kernel Information Disclosure
Affected packages
11.2 <= FreeBSD-kernel < 11.2_2
11.1 <= FreeBSD-kernel < 11.1_13
Details
VuXML ID 2310b814-a652-11e8-805b-a4badb2f4699
Discovery 2018-08-14
Entry 2018-08-22
Problem Description:
On certain Intel 64-bit x86 systems there is a period of time during terminal
fault handling where the CPU may use speculative execution to try to load
data. The CPU may speculatively access the level 1 data cache (L1D). Data
which would otherwise be protected may then be determined by using side
channel methods.
This issue affects bhyve on FreeBSD/amd64 systems.
Impact:
An attacker executing user code, or kernel code inside of a virtual machine,
may be able to read secret data from the kernel or from another virtual
machine.
References
CVE Name CVE-2018-3620
CVE Name CVE-2018-3646
FreeBSD Advisory SA-18:09.l1tf
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===========================================================================
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