Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.3084
linux security update for Debian 9 & 10
13 August 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux
Publisher: Debian
Operating System: Debian GNU/Linux 9
Debian GNU/Linux 10
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-14284 CVE-2019-14283 CVE-2019-13648
CVE-2019-13631 CVE-2019-10639 CVE-2019-10638
CVE-2019-10207 CVE-2019-3900 CVE-2019-3882
CVE-2019-1125 CVE-2018-20856 CVE-2018-20836
CVE-2018-5995 CVE-2015-8553
Reference: ESB-2019.1909
ESB-2019.1710.2
ESB-2015.3218
Original Bulletin:
http://www.debian.org/security/2019/dsa-4497
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
- - -------------------------------------------------------------------------
Debian Security Advisory DSA-4497-1 security@debian.org
https://www.debian.org/security/ Ben Hutchings
August 13, 2019 https://www.debian.org/security/faq
- - -------------------------------------------------------------------------
Package : linux
CVE ID : CVE-2015-8553 CVE-2018-5995 CVE-2018-20836 CVE-2018-20856
CVE-2019-1125 CVE-2019-3882 CVE-2019-3900 CVE-2019-10207
CVE-2019-10638 CVE-2019-10639 CVE-2019-13631 CVE-2019-13648
CVE-2019-14283 CVE-2019-14284
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2015-8553
Jan Beulich discovered that CVE-2015-2150 was not completely
addressed. If a PCI physical function is passed through to a
Xen guest, the guest is able to access its memory and I/O
regions before enabling decoding of those regions. This could
result in a denial-of-service (unexpected NMI) on the host.
The fix for this is incompatible with qemu versions before 2.5.
(CVE ID not yet assigned)
Denis Andzakovic reported a missing type check in the IPv4 multicast
routing implementation. A user with the CAP_NET_ADMIN capability (in
any user namespace) could use this for denial-of-service (memory
corruption or crash) or possibly for privilege escalation.
CVE-2018-5995
ADLab of VenusTech discovered that the kernel logged the virtual
addresses assigned to per-CPU data, which could make it easier to
exploit other vulnerabilities.
CVE-2018-20836
chenxiang reported a race condition in libsas, the kernel
subsystem supporting Serial Attached SCSI (SAS) devices, which
could lead to a use-after-free. It is not clear how this might be
exploited.
CVE-2018-20856
Xiao Jin reported a potential double-free in the block subsystem,
in case an error occurs while initialising the I/O scheduler for a
block device. It is not clear how this might be exploited.
CVE-2019-1125
It was discovered that most x86 processors could speculatively
skip a conditional SWAPGS instruction used when entering the
kernel from user mode, and/or could speculatively execute it when
it should be skipped. This is a subtype of Spectre variant 1,
which could allow local users to obtain sensitive information from
the kernel or other processes. It has been mitigated by using
memory barriers to limit speculative execution. Systems using an
i386 kernel are not affected as the kernel does not use SWAPGS.
CVE-2019-3882
It was found that the vfio implementation did not limit the number
of DMA mappings to device memory. A local user granted ownership
of a vfio device could use this to cause a denial of service
(out-of-memory condition).
CVE-2019-3900
It was discovered that vhost drivers did not properly control the
amount of work done to service requests from guest VMs. A
malicious guest could use this to cause a denial-of-service
(unbounded CPU usage) on the host.
CVE-2019-10207
The syzkaller tool found a potential null dereference in various
drivers for UART-attached Bluetooth adapters. A local user with
access to a pty device or other suitable tty device could use this
for denial-of-service (BUG/oops).
CVE-2019-10638
Amit Klein and Benny Pinkas discovered that the generation of IP
packet IDs used a weak hash function, "jhash". This could enable
tracking individual computers as they communicate with different
remote servers and from different networks. The "siphash"
function is now used instead.
CVE-2019-10639
Amit Klein and Benny Pinkas discovered that the generation of IP
packet IDs used a weak hash function that incorporated a kernel
virtual address. This hash function is no longer used for IP IDs,
although it is still used for other purposes in the network stack.
CVE-2019-13631
It was discovered that the gtco driver for USB input tablets could
overrun a stack buffer with constant data while parsing the device's
descriptor. A physically present user with a specially
constructed USB device could use this to cause a denial-of-service
(BUG/oops), or possibly for privilege escalation.
CVE-2019-13648
Praveen Pandey reported that on PowerPC (ppc64el) systems without
Transactional Memory (TM), the kernel would still attempt to
restore TM state passed to the sigreturn() system call. A local
user could use this for denial-of-service (oops).
CVE-2019-14283
The syzkaller tool found a missing bounds check in the floppy disk
driver. A local user with access to a floppy disk device, with a
disk present, could use this to read kernel memory beyond the
I/O buffer, possibly obtaining sensitive information.
CVE-2019-14284
The syzkaller tool found a potential division-by-zero in the
floppy disk driver. A local user with access to a floppy disk
device could use this for denial-of-service (oops).
(CVE ID not yet assigned)
Denis Andzakovic reported a possible use-after-free in the
TCP sockets implementation. A local user could use this for
denial-of-service (memory corruption or crash) or possibly
for privilege escalation.
(CVE ID not yet assigned)
The netfilter conntrack subsystem used kernel addresses as
user-visible IDs, which could make it easier to exploit other
security vulnerabilities.
XSA-300
Julien Grall reported that Linux does not limit the amount of memory
which a domain will attempt to baloon out, nor limits the amount of
"foreign / grant map" memory which any individual guest can consume,
leading to denial of service conditions (for host or guests).
For the oldstable distribution (stretch), these problems have been fixed
in version 4.9.168-1+deb9u5.
For the stable distribution (buster), these problems were mostly fixed
in version 4.19.37-5+deb10u2 or earlier.
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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=2+Tr
- -----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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=MiO2
-----END PGP SIGNATURE-----