Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2018.0012
linux security update
2 January 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Debian
Operating System: Debian GNU/Linux 9
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-1000410 CVE-2017-1000407 CVE-2017-17864
CVE-2017-17863 CVE-2017-17862 CVE-2017-17807
CVE-2017-17806 CVE-2017-17805 CVE-2017-17741
CVE-2017-17712 CVE-2017-17558 CVE-2017-17450
CVE-2017-17449 CVE-2017-17448 CVE-2017-16995
CVE-2017-16644 CVE-2017-16538 CVE-2017-8824
Reference: ESB-2017.3259
Original Bulletin:
http://www.debian.org/security/2017/dsa-4073
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
- - -------------------------------------------------------------------------
Debian Security Advisory DSA-4073-1 security@debian.org
https://www.debian.org/security/ Ben Hutchings
December 23, 2017 https://www.debian.org/security/faq
- - -------------------------------------------------------------------------
Package : linux
CVE ID : CVE-2017-8824 CVE-2017-16538 CVE-2017-16644 CVE-2017-16995
CVE-2017-17448 CVE-2017-17449 CVE-2017-17450 CVE-2017-17558
CVE-2017-17712 CVE-2017-17741 CVE-2017-17805 CVE-2017-17806
CVE-2017-17807 CVE-2017-17862 CVE-2017-17863 CVE-2017-17864
CVE-2017-1000407 CVE-2017-1000410
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2017-8824
Mohamed Ghannam discovered that the DCCP implementation did not
correctly manage resources when a socket is disconnected and
reconnected, potentially leading to a use-after-free. A local
user could use this for denial of service (crash or data
corruption) or possibly for privilege escalation. On systems that
do not already have the dccp module loaded, this can be mitigated
by disabling it:
echo >> /etc/modprobe.d/disable-dccp.conf install dccp false
CVE-2017-16538
Andrey Konovalov reported that the dvb-usb-lmedm04 media driver
did not correctly handle some error conditions during
initialisation. A physically present user with a specially
designed USB device can use this to cause a denial of service
(crash).
CVE-2017-16644
Andrey Konovalov reported that the hdpvr media driver did not
correctly handle some error conditions during initialisation. A
physically present user with a specially designed USB device can
use this to cause a denial of service (crash).
CVE-2017-16995
Jann Horn discovered that the Extended BPF verifier did not
correctly model the behaviour of 32-bit load instructions. A
local user can use this for privilege escalation.
CVE-2017-17448
Kevin Cernekee discovered that the netfilter subsystem allowed
users with the CAP_NET_ADMIN capability in any user namespace, not
just the root namespace, to enable and disable connection tracking
helpers. This could lead to denial of service, violation of
network security policy, or have other impact.
CVE-2017-17449
Kevin Cernekee discovered that the netlink subsystem allowed
users with the CAP_NET_ADMIN capability in any user namespace
to monitor netlink traffic in all net namespaces, not just
those owned by that user namespace. This could lead to
exposure of sensitive information.
CVE-2017-17450
Kevin Cernekee discovered that the xt_osf module allowed users
with the CAP_NET_ADMIN capability in any user namespace to modify
the global OS fingerprint list.
CVE-2017-17558
Andrey Konovalov reported that that USB core did not correctly
handle some error conditions during initialisation. A physically
present user with a specially designed USB device can use this to
cause a denial of service (crash or memory corruption), or
possibly for privilege escalation.
CVE-2017-17712
Mohamed Ghannam discovered a race condition in the IPv4 raw socket
implementation. A local user could use this to obtain sensitive
information from the kernel.
CVE-2017-17741
Dmitry Vyukov reported that the KVM implementation for x86 would
over-read data from memory when emulating an MMIO write if the
kvm_mmio tracepoint was enabled. A guest virtual machine might be
able to use this to cause a denial of service (crash).
CVE-2017-17805
It was discovered that some implementations of the Salsa20 block
cipher did not correctly handle zero-length input. A local user
could use this to cause a denial of service (crash) or possibly
have other security impact.
CVE-2017-17806
It was discovered that the HMAC implementation could be used with
an underlying hash algorithm that requires a key, which was not
intended. A local user could use this to cause a denial of
service (crash or memory corruption), or possibly for privilege
escalation.
CVE-2017-17807
Eric Biggers discovered that the KEYS subsystem lacked a check for
write permission when adding keys to a process's default keyring.
A local user could use this to cause a denial of service or to
obtain sensitive information.
CVE-2017-17862
Alexei Starovoitov discovered that the Extended BPF verifier
ignored unreachable code, even though it would still be processed
by JIT compilers. This could possibly be used by local users for
denial of service. It also increases the severity of bugs in
determining unreachable code.
CVE-2017-17863
Jann Horn discovered that the Extended BPF verifier did not
correctly model pointer arithmetic on the stack frame pointer.
A local user can use this for privilege escalation.
CVE-2017-17864
Jann Horn discovered that the Extended BPF verifier could fail to
detect pointer leaks from conditional code. A local user could
use this to obtain sensitive information in order to exploit
other vulnerabilities.
CVE-2017-1000407
Andrew Honig reported that the KVM implementation for Intel
processors allowed direct access to host I/O port 0x80, which
is not generally safe. On some systems this allows a guest
VM to cause a denial of service (crash) of the host.
CVE-2017-1000410
Ben Seri reported that the Bluetooth subsystem did not correctly
handle short EFS information elements in L2CAP messages. An
attacker able to communicate over Bluetooth could use this to
obtain sensitive information from the kernel.
The various problems in the Extended BPF verifier can be mitigated by
disabling use of Extended BPF by unprivileged users:
sysctl kernel.unprivileged_bpf_disabled=1
Debian disables unprivileged user namespaces by default, but if they
are enabled (via the kernel.unprivileged_userns_clone sysctl) then
CVE-2017-17448 can be exploited by any local user.
For the stable distribution (stretch), these problems have been fixed in
version 4.9.65-3+deb9u1.
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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=hqlD
- -----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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=dmC1
-----END PGP SIGNATURE-----