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AUSCERT External Security Bulletin Redistribution
ESB-2019.1126
USN-3932-1/2: Linux kernel vulnerabilities
3 April 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-9213 CVE-2019-7222 CVE-2019-7221
CVE-2019-6974 CVE-2019-3819 CVE-2019-3701
CVE-2019-3460 CVE-2019-3459 CVE-2018-16884
CVE-2018-14616 CVE-2018-14614 CVE-2018-14613
CVE-2018-14612 CVE-2018-14611 CVE-2018-14610
CVE-2018-13100 CVE-2018-13099 CVE-2018-13097
CVE-2018-9517 CVE-2017-18249
Reference: ESB-2019.1105
ESB-2019.1097
ESB-2019.1081
ESB-2019.1035
ESB-2019.1025.2
ESB-2019.1005
ESB-2019.1004
Original Bulletin:
https://usn.ubuntu.com/3932-1/
https://usn.ubuntu.com/3932-2/
Comment: This bulletin contains two (2) advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-3932-1: Linux kernel vulnerabilities
2 April 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-kvm - Linux kernel for cloud environments
o linux-raspi2 - Linux kernel for Raspberry Pi 2
o linux-snapdragon - Linux kernel for Snapdragon processors
Details
It was discovered that a race condition existed in the f2fs file system
implementation in the Linux kernel. A local attacker could use this to cause a
denial of service. (CVE-2017-18249)
Wen Xu discovered that the f2fs file system implementation in the Linux kernel
did not properly validate metadata. An attacker could use this to construct a
malicious f2fs image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100,
CVE-2018-14614, CVE-2018-14616)
Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in
the Linux kernel did not properly validate metadata. An attacker could use this
to construct a malicious btrfs image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612,
CVE-2018-14613)
Vasily Averin and Evgenii Shatokhin discovered that a use-after-free
vulnerability existed in the NFS41+ subsystem when multiple network namespaces
are in use. A local attacker in a container could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-16884)
It was discovered that a use-after-free vulnerability existed in the PPP over
L2TP implementation in the Linux kernel. A privileged local attacker could use
this to possibly execute arbitrary code. (CVE-2018-9517)
Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)
Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)
Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)
Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)
Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)
Muyu Yu discovered that the CAN implementation in the Linux kernel in some
situations did not properly restrict the field size when processing outgoing
frames. A local attacker with CAP_NET_ADMIN privileges could use this to
execute arbitrary code. (CVE-2019-3701)
Vladis Dronov discovered that the debug interface for the Linux kernel's HID
subsystem did not properly validate passed parameters in some situations. A
local privileged attacker could use this to cause a denial of service (infinite
loop). (CVE-2019-3819)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1043-kvm - 4.4.0-1043.49
linux-image-4.4.0-1079-aws - 4.4.0-1079.89
linux-image-4.4.0-1106-raspi2 - 4.4.0-1106.114
linux-image-4.4.0-1110-snapdragon - 4.4.0-1110.115
linux-image-4.4.0-145-generic - 4.4.0-145.171
linux-image-4.4.0-145-generic-lpae - 4.4.0-145.171
linux-image-4.4.0-145-lowlatency - 4.4.0-145.171
linux-image-4.4.0-145-powerpc-e500mc - 4.4.0-145.171
linux-image-4.4.0-145-powerpc-smp - 4.4.0-145.171
linux-image-4.4.0-145-powerpc64-emb - 4.4.0-145.171
linux-image-4.4.0-145-powerpc64-smp - 4.4.0-145.171
linux-image-aws - 4.4.0.1079.82
linux-image-generic - 4.4.0.145.153
linux-image-generic-lpae - 4.4.0.145.153
linux-image-kvm - 4.4.0.1043.43
linux-image-lowlatency - 4.4.0.145.153
linux-image-powerpc-e500mc - 4.4.0.145.153
linux-image-powerpc-smp - 4.4.0.145.153
linux-image-powerpc64-emb - 4.4.0.145.153
linux-image-powerpc64-smp - 4.4.0.145.153
linux-image-raspi2 - 4.4.0.1106.106
linux-image-snapdragon - 4.4.0.1110.102
linux-image-virtual - 4.4.0.145.153
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to reboot your computer to make all the
necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given
a new version number, which requires you to recompile and reinstall all third
party kernel modules you might have installed. Unless you manually uninstalled
the standard kernel metapackages (e.g. linux-generic,
linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system
upgrade will automatically perform this as well.
References
o CVE-2017-18249
o CVE-2018-13097
o CVE-2018-13099
o CVE-2018-13100
o CVE-2018-14610
o CVE-2018-14611
o CVE-2018-14612
o CVE-2018-14613
o CVE-2018-14614
o CVE-2018-14616
o CVE-2018-16884
o CVE-2018-9517
o CVE-2019-3459
o CVE-2019-3460
o CVE-2019-3701
o CVE-2019-3819
o CVE-2019-6974
o CVE-2019-7221
o CVE-2019-7222
o CVE-2019-9213
- --------------------------------------------------------------------------------
USN-3932-2: Linux kernel (Xenial HWE) vulnerabilities
2 April 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
Details
USN-3932-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This
update provides the corresponding updates for the Linux Hardware Enablement
(HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.
It was discovered that a race condition existed in the f2fs file system
implementation in the Linux kernel. A local attacker could use this to cause a
denial of service. (CVE-2017-18249)
Wen Xu discovered that the f2fs file system implementation in the Linux kernel
did not properly validate metadata. An attacker could use this to construct a
malicious f2fs image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100,
CVE-2018-14614, CVE-2018-14616)
Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in
the Linux kernel did not properly validate metadata. An attacker could use this
to construct a malicious btrfs image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612,
CVE-2018-14613)
Vasily Averin and Evgenii Shatokhin discovered that a use-after-free
vulnerability existed in the NFS41+ subsystem when multiple network namespaces
are in use. A local attacker in a container could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-16884)
It was discovered that a use-after-free vulnerability existed in the PPP over
L2TP implementation in the Linux kernel. A privileged local attacker could use
this to possibly execute arbitrary code. (CVE-2018-9517)
Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)
Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)
Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)
Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)
Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)
Muyu Yu discovered that the CAN implementation in the Linux kernel in some
situations did not properly restrict the field size when processing outgoing
frames. A local attacker with CAP_NET_ADMIN privileges could use this to
execute arbitrary code. (CVE-2019-3701)
Vladis Dronov discovered that the debug interface for the Linux kernel's HID
subsystem did not properly validate passed parameters in some situations. A
local privileged attacker could use this to cause a denial of service (infinite
loop). (CVE-2019-3819)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04 LTS
linux-image-4.4.0-1040-aws - 4.4.0-1040.43
linux-image-4.4.0-144-generic - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-generic-lpae - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-lowlatency - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-powerpc-e500mc - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-powerpc-smp - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-powerpc64-emb - 4.4.0-144.170~14.04.1
linux-image-4.4.0-144-powerpc64-smp - 4.4.0-144.170~14.04.1
linux-image-aws - 4.4.0.1040.41
linux-image-generic-lpae-lts-xenial - 4.4.0.144.127
linux-image-generic-lts-xenial - 4.4.0.144.127
linux-image-lowlatency-lts-xenial - 4.4.0.144.127
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.144.127
linux-image-powerpc-smp-lts-xenial - 4.4.0.144.127
linux-image-powerpc64-emb-lts-xenial - 4.4.0.144.127
linux-image-powerpc64-smp-lts-xenial - 4.4.0.144.127
linux-image-virtual-lts-xenial - 4.4.0.144.127
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to reboot your computer to make all the
necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given
a new version number, which requires you to recompile and reinstall all third
party kernel modules you might have installed. Unless you manually uninstalled
the standard kernel metapackages (e.g. linux-generic,
linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system
upgrade will automatically perform this as well.
References
o USN-3932-1
o CVE-2017-18249
o CVE-2018-13097
o CVE-2018-13099
o CVE-2018-13100
o CVE-2018-14610
o CVE-2018-14611
o CVE-2018-14612
o CVE-2018-14613
o CVE-2018-14614
o CVE-2018-14616
o CVE-2018-16884
o CVE-2018-9517
o CVE-2019-3459
o CVE-2019-3460
o CVE-2019-3701
o CVE-2019-3819
o CVE-2019-6974
o CVE-2019-7221
o CVE-2019-7222
o CVE-2019-9213
- --------------------------END INCLUDED TEXT--------------------
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