ESB-2018.2549 - [Debian] Linux kernel: Access privileged data - Existing account 2018-08-29

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2549
                  [DLA 1481-1] linux-4.9 security update
                              29 August 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Linux kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3646 CVE-2018-3620 

Reference:         ESB-2018.2534
                   ESB-2018.2487
                   ESB-2018.2184
                   ESB-2018.2445.2

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2018/08/msg00029.html

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Package        : linux-4.9
Version        : 4.9.110-3+deb9u4~deb8u1
CVE ID         : CVE-2018-3620 CVE-2018-3646
Debian Bug     : 906769

Multiple researchers have discovered a vulnerability in the way the
Intel processor designs have implemented speculative execution of
instructions in combination with handling of page-faults. This flaw
could allow an attacker controlling an unprivileged process to read
memory from arbitrary (non-user controlled) addresses, including from
the kernel and all other processes running on the system or cross
guest/host boundaries to read host memory.

To fully resolve these vulnerabilities it is also necessary to install
updated CPU microcode (only available in Debian non-free). Common server
class CPUs are covered in the update released as DLA 1446-1.

For Debian 8 "Jessie", these problems have been fixed in version
4.9.110-3+deb9u4~deb8u1.

We recommend that you upgrade your linux-4.9 packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

Ben Hutchings - Debian developer, member of kernel, installer and LTS teams

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