Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.1025.2
Several vulnerabilities have been discovered in the Linux kernel
2 April 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Privileged Data -- Existing Account
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-9213 CVE-2019-7222 CVE-2019-7221
CVE-2019-6974 CVE-2019-3819 CVE-2019-3701
CVE-2018-20511 CVE-2018-20169 CVE-2018-19985
CVE-2018-19824 CVE-2018-18710 CVE-2018-18690
CVE-2018-18281 CVE-2018-17972 CVE-2018-16884
CVE-2018-16862 CVE-2018-13053 CVE-2018-12896
CVE-2018-5953 CVE-2018-5848 CVE-2018-3639
CVE-2018-1998 CVE-2018-1828 CVE-2017-13305
CVE-2017-5753 CVE-2016-10741
Reference: ASB-2019.0029
ASB-2019.0002
ESB-2019.1005
ESB-2019.1004
ESB-2019.0984
ASB-2018.0192
ESB-2019.1003.2
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
Comment: This bulletin contains two (2) advisories.
Revision History: April 2 2019: Added regression update DLA 1731-2
March 28 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Package : linux
Version : 3.16.64-1
CVE ID : CVE-2016-10741 CVE-2017-5753 CVE-2017-13305 CVE-2018-3639
CVE-2018-5848 CVE-2018-5953 CVE-2018-12896 CVE-2018-13053
CVE-2018-16862 CVE-2018-16884 CVE-2018-17972 CVE-2018-18281
CVE-2018-18690 CVE-2018-18710 CVE-2018-19824 CVE-2018-19985
CVE-2018-20169 CVE-2018-20511 CVE-2019-3701 CVE-2019-3819
CVE-2019-6974 CVE-2019-7221 CVE-2019-7222 CVE-2019-9213
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2016-10741
A race condition was discovered in XFS that would result in a
crash (BUG). A local user permitted to write to an XFS volume
could use this for denial of service.
CVE-2017-5753
Further instances of code that was vulnerable to Spectre variant 1
(bounds-check bypass) have been mitigated.
CVE-2017-13305
A memory over-read was discovered in the keys subsystem's
encrypted key type. A local user could use this for denial of
service or possibly to read sensitive information.
CVE-2018-3639 (SSB)
Multiple researchers have discovered that Speculative Store Bypass
(SSB), a feature implemented in many processors, could be used to
read sensitive information from another context. In particular,
code in a software sandbox may be able to read sensitive
information from outside the sandbox. This issue is also known as
Spectre variant 4.
This update fixes bugs in the mitigations for SSB for AMD
processors.
CVE-2018-5848
The wil6210 wifi driver did not properly validate lengths in scan
and connection requests, leading to a possible buffer overflow.
On systems using this driver, a local user with the CAP_NET_ADMIN
capability could use this for denial of service (memory corruption
or crash) or potentially for privilege escalation.
CVE-2018-5953
The swiotlb subsystem printed kernel memory addresses to the
system log, which could help a local attacker to exploit other
vulnerabilities.
CVE-2018-12896, CVE-2018-13053
Team OWL337 reported possible integer overflows in the POSIX
timer implementation. These might have some security impact.
CVE-2018-16862
Vasily Averin and Pavel Tikhomirov from Virtuozzo Kernel Team
discovered that the cleancache memory management feature did not
invalidate cached data for deleted files. On Xen guests using the
tmem driver, local users could potentially read data from other
users' deleted files if they were able to create new files on the
same volume.
CVE-2018-16884
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.
CVE-2018-17972
Jann Horn reported that the /proc/*/stack files in procfs leaked
sensitive data from the kernel. These files are now only readable
by users with the CAP_SYS_ADMIN capability (usually only root)
CVE-2018-18281
Jann Horn reported a race condition in the virtual memory manager
that can result in a process briefly having access to memory after
it is freed and reallocated. A local user permitted to create
containers could possibly exploit this for denial of service
(memory corruption) or for privilege escalation.
CVE-2018-18690
Kanda Motohiro reported that XFS did not correctly handle some
xattr (extended attribute) writes that require changing the disk
format of the xattr. A user with access to an XFS volume could use
this for denial of service.
CVE-2018-18710
It was discovered that the cdrom driver does not correctly
validate the parameter to the CDROM_SELECT_DISC ioctl. A user with
access to a cdrom device could use this to read sensitive
information from the kernel or to cause a denial of service
(crash).
CVE-2018-19824
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
escalation.
CVE-2018-19985
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
(crash).
CVE-2018-20169
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.
CVE-2018-20511
InfoSect reported an information leak in the AppleTalk IP/DDP
implemntation. A local user with CAP_NET_ADMIN capability could
use this to read sensitive information from the kernel.
CVE-2019-3701
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.
CVE-2019-3819
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.
CVE-2019-6974
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
escalation.
CVE-2019-7221
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
issue.
CVE-2019-7222
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.
CVE-2019-9213
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
3.16.64-1.
We recommend that you upgrade your linux 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
- -----------------------------------------------------------------------------
Package : linux
Version : 3.16.64-2
CVE ID : CVE-2016-10741 CVE-2017-5753 CVE-2017-13305 CVE-2018-3639
CVE-2018-5848 CVE-2018-5953 CVE-2018-12896 CVE-2018-13053
CVE-2018-16862 CVE-2018-16884 CVE-2018-17972 CVE-2018-1828=
1
CVE-2018-18690 CVE-2018-18710 CVE-2018-19824 CVE-2018-1998=
5
CVE-2018-20169 CVE-2018-20511 CVE-2019-3701 CVE-2019-3819
CVE-2019-6974 CVE-2019-7221 CVE-2019-7222 CVE-2019-9213
Debian Bug : 925919
The linux update issued as DLA-1731-1 caused a regression in the
vmxnet3 (VMware virtual network adapter) driver. This update corrects
that regression, and an earlier regression in the CIFS network
filesystem implementation introduced in DLA-1422-1. For reference the
original advisory text follows.
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.
CVE-2016-10741
A race condition was discovered in XFS that would result in a
crash (BUG). A local user permitted to write to an XFS volume
could use this for denial of service.
CVE-2017-5753
Further instances of code that was vulnerable to Spectre variant 1
(bounds-check bypass) have been mitigated.
CVE-2017-13305
A memory over-read was discovered in the keys subsystem's
encrypted key type. A local user could use this for denial of
service or possibly to read sensitive information.
CVE-2018-3639 (SSB)
Multiple researchers have discovered that Speculative Store Bypass
(SSB), a feature implemented in many processors, could be used to
read sensitive information from another context. In particular,
code in a software sandbox may be able to read sensitive
information from outside the sandbox. This issue is also known as
Spectre variant 4.
This update fixes bugs in the mitigations for SSB for AMD
processors.
CVE-2018-5848
The wil6210 wifi driver did not properly validate lengths in scan
and connection requests, leading to a possible buffer overflow.
On systems using this driver, a local user with the CAP_NET_ADMIN
capability could use this for denial of service (memory corruption
or crash) or potentially for privilege escalation.
CVE-2018-5953
The swiotlb subsystem printed kernel memory addresses to the
system log, which could help a local attacker to exploit other
vulnerabilities.
CVE-2018-12896, CVE-2018-13053
Team OWL337 reported possible integer overflows in the POSIX
timer implementation. These might have some security impact.
CVE-2018-16862
Vasily Averin and Pavel Tikhomirov from Virtuozzo Kernel Team
discovered that the cleancache memory management feature did not
invalidate cached data for deleted files. On Xen guests using the
tmem driver, local users could potentially read data from other
users' deleted files if they were able to create new files on the
same volume.
CVE-2018-16884
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.
CVE-2018-17972
Jann Horn reported that the /proc/*/stack files in procfs leaked
sensitive data from the kernel. These files are now only readable
by users with the CAP_SYS_ADMIN capability (usually only root)
CVE-2018-18281
Jann Horn reported a race condition in the virtual memory manager
that can result in a process briefly having access to memory after
it is freed and reallocated. A local user permitted to create
containers could possibly exploit this for denial of service
(memory corruption) or for privilege escalation.
CVE-2018-18690
Kanda Motohiro reported that XFS did not correctly handle some
xattr (extended attribute) writes that require changing the disk
format of the xattr. A user with access to an XFS volume could use
this for denial of service.
CVE-2018-18710
It was discovered that the cdrom driver does not correctly
validate the parameter to the CDROM_SELECT_DISC ioctl. A user with
access to a cdrom device could use this to read sensitive
information from the kernel or to cause a denial of service
(crash).
CVE-2018-19824
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
escalation.
CVE-2018-19985
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
(crash).
CVE-2018-20169
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.
CVE-2018-20511
InfoSect reported an information leak in the AppleTalk IP/DDP
implemntation. A local user with CAP_NET_ADMIN capability could
use this to read sensitive information from the kernel.
CVE-2019-3701
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.
CVE-2019-3819
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.
CVE-2019-6974
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
escalation.
CVE-2019-7221
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
issue.
CVE-2019-7222
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.
CVE-2019-9213
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
3.16.64-1.
We recommend that you upgrade your linux 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
- --------------------------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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=Tzrm
-----END PGP SIGNATURE-----