Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

                  [DLA 1771-1] linux-4.9 security update
                                6 May 2019


        AusCERT Security Bulletin Summary

Product:           linux-4.9
Publisher:         Debian
Operating System:  Debian GNU/Linux
                   Debian GNU/Linux 8
Impact/Access:     Root Compromise        -- Existing Account      
                   Access Privileged Data -- Remote/Unauthenticated
                   Denial of Service      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-9213 CVE-2019-8980 CVE-2019-7222
                   CVE-2019-7221 CVE-2019-6974 CVE-2019-3819
                   CVE-2019-3701 CVE-2019-3460 CVE-2019-3459
                   CVE-2018-1000026 CVE-2018-20169 CVE-2018-19985
                   CVE-2018-19824 CVE-2018-16884 CVE-2018-14625

Reference:         ESB-2019.1390

Original Bulletin: 

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

Package        : linux-4.9
Version        : 4.9.168-1~deb8u1
CVE ID         : CVE-2018-14625 CVE-2018-16884 CVE-2018-19824 CVE-2018-19985
                 CVE-2018-20169 CVE-2018-1000026 CVE-2019-3459 CVE-2019-3460
                 CVE-2019-3701 CVE-2019-3819 CVE-2019-6974 CVE-2019-7221
                 CVE-2019-7222 CVE-2019-8980 CVE-2019-9213
Debian Bug     : 904385 918103 922306

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


    A use-after-free bug was found in the vhost driver for the Virtual
    Socket protocol.  If this driver is used to communicate with a
    malicious virtual machine guest, the guest could read sensitive
    information from the host kernel.


    A flaw was found in the NFS 4.1 client implementation. Mounting
    NFS shares in multiple network namespaces at the same time could
    lead to a user-after-free. Local users might be able to use this
    for denial of service (memory corruption or crash) or possibly
    for privilege escalation.

    This can be mitigated by disabling unprivileged users from
    creating user namespaces, which is the default in Debian.


    Hui Peng and Mathias Payer discovered a use-after-free bug in the
    USB audio driver. A physically present attacker able to attach a
    specially designed USB device could use this for privilege


    Hui Peng and Mathias Payer discovered a missing bounds check in the
    hso USB serial driver. A physically present user able to attach a
    specially designed USB device could use this to read sensitive
    information from the kernel or to cause a denial of service


    Hui Peng and Mathias Payer discovered missing bounds checks in the
    USB core. A physically present attacker able to attach a specially
    designed USB device could use this to cause a denial of service
    (crash) or possibly for privilege escalation.


    It was discovered that Linux could forward aggregated network
    packets with a segmentation size too large for the output device.
    In the specific case of Broadcom NetXtremeII 10Gb adapters, this
    would result in a denial of service (firmware crash).  This update
    adds a mitigation to the bnx2x driver for this hardware.

CVE-2019-3459, CVE-2019-3460

    Shlomi Oberman, Yuli Shapiro and Karamba Security Ltd. research
    team discovered missing range checks in the Bluetooth L2CAP
    implementation.  If Bluetooth is enabled, a nearby attacker
    could use these to read sensitive information from the kernel.


    Muyu Yu and Marcus Meissner reported that the CAN gateway
    implementation allowed the frame length to be modified, typically
    resulting in out-of-bounds memory-mapped I/O writes.  On a system
    with CAN devices present, a local user with CAP_NET_ADMIN
    capability in the initial net namespace could use this to cause a
    crash (oops) or other hardware-dependent impact.


    A potential infinite loop was discovered in the HID debugfs
    interface exposed under /sys/kernel/debug/hid. A user with access
    to these files could use this for denial of service.

    This interface is only accessible to root by default, which fully
    mitigates the issue.


    Jann Horn reported a use-after-free bug in KVM. A local user
    with access to /dev/kvm could use this to cause a denial of
    service (memory corruption or crash) or possibly for privilege


    Jim Mattson and Felix Wilhelm reported a user-after-free bug in
    KVM's nested VMX implementation. On systems with Intel CPUs, a
    local user with access to /dev/kvm could use this to cause a
    denial of service (memory corruption or crash) or possibly for
    privilege escalation.

    Nested VMX is disabled by default, which fully mitigates the


    Felix Wilhelm reported an information leak in KVM for x86.
    A local user with access to /dev/kvm could use this to read
    sensitive information from the kernel.


    A bug was discovered in the kernel_read_file() function used to
    load firmware files. In certain error conditions it could leak
    memory, which might lead to a denial of service. This is probbaly
    not exploitable in a Debian system.


    Jann Horn reported that privileged tasks could cause stack
    segments, including those in other processes, to grow downward to
    address 0. On systems lacking SMAP (x86) or PAN (ARM), this
    exacerbated other vulnerabilities: a null pointer dereference
    could be exploited for privilege escalation rather than only for
    denial of service.

For Debian 8 "Jessie", these problems have been fixed in version
4.9.168-1~deb8u1.  This version also includes fixes for Debian bugs
#904385, #918103, and #922306; and other fixes included in upstream
stable updates.

We recommend that you upgrade your linux-4.9 and linux-latest-4.9
packages.  You will need to use "apt-get upgrade --with-new-pkgs"
or "apt upgrade" as the binary package names have changed.

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

- --------------------------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:


Australian Computer Emergency Response Team
The University of Queensland
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.
Comment: http://www.auscert.org.au/render.html?it=1967