ESB-2018.1411 - [Debian] kernel: Multiple vulnerabilities 2018-05-09

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1411
                           linux security update
                                9 May 2018

===========================================================================

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

Product:           kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
                   Debian GNU/Linux 8
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8897 CVE-2018-1108 CVE-2018-1087

Reference:         ESB-2018-1408

Original Bulletin: 
   http://www.debian.org/security/2018/dsa-4196

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

- - -------------------------------------------------------------------------
Debian Security Advisory DSA-4196-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
May 08, 2018                          https://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : linux
CVE ID         : CVE-2018-1087 CVE-2018-8897
Debian Bug     : 897427 897599 898067 898100

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation or denial of service.

CVE-2018-1087

    Andy Lutomirski discovered that the KVM implementation did not
    properly handle #DB exceptions while deferred by MOV SS/POP SS,
    allowing an unprivileged KVM guest user to crash the guest or
    potentially escalate their privileges.

CVE-2018-8897

    Nick Peterson of Everdox Tech LLC discovered that #DB exceptions
    that are deferred by MOV SS or POP SS are not properly handled,
    allowing an unprivileged user to crash the kernel and cause a denial
    of service.

For the oldstable distribution (jessie), these problems have been fixed
in version 3.16.56-1+deb8u1. This update includes various fixes for
regressions from 3.16.56-1 as released in DSA-4187-1 (Cf. #897427,
#898067 and #898100).

For the stable distribution (stretch), these problems have been fixed in
version 4.9.88-1+deb9u1. The fix for CVE-2018-1108 applied in DSA-4188-1
is temporarily reverted due to various regression, cf. #897599.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/linux

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

Mailing list: debian-security-announce@lists.debian.org
- -----BEGIN PGP SIGNATURE-----
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=CskH
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=0CJZ
-----END PGP SIGNATURE-----

« Back to bulletins