ESB-2018.2500 - [FreeBSD] FreeBSD kernel: Access privileged data - Existing account 2018-08-23

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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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