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AUSCERT External Security Bulletin Redistribution
ESB-2019.4540
USN-4211: Linux kernel vulnerabilities
3 December 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-17133 CVE-2019-17075 CVE-2018-20784
Reference: ESB-2019.4537
ESB-2019.3335
ESB-2019.2865
Original Bulletin:
https://usn.ubuntu.com/4211-1/
https://usn.ubuntu.com/4211-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4211-1: Linux kernel vulnerabilities
3 December 2019
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
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
Zhipeng Xie discovered that an infinite loop could be triggered in the CFS
Linux kernel process scheduler. A local attacker could possibly use this to
cause a denial of service. (CVE-2018-20784)
Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did
not properly validate SSID lengths. A physically proximate attacker could use
this to cause a denial of service (system crash). (CVE-2019-17133)
Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux
kernel performed DMA from a kernel stack. A local attacker could use this to
cause a denial of service (system crash). (CVE-2019-17075)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1063-kvm - 4.4.0-1063.70
linux-image-4.4.0-1099-aws - 4.4.0-1099.110
linux-image-4.4.0-1126-raspi2 - 4.4.0-1126.135
linux-image-4.4.0-1130-snapdragon - 4.4.0-1130.138
linux-image-4.4.0-170-generic - 4.4.0-170.199
linux-image-4.4.0-170-generic-lpae - 4.4.0-170.199
linux-image-4.4.0-170-lowlatency - 4.4.0-170.199
linux-image-4.4.0-170-powerpc-e500mc - 4.4.0-170.199
linux-image-4.4.0-170-powerpc-smp - 4.4.0-170.199
linux-image-4.4.0-170-powerpc64-emb - 4.4.0-170.199
linux-image-4.4.0-170-powerpc64-smp - 4.4.0-170.199
linux-image-aws - 4.4.0.1099.103
linux-image-generic - 4.4.0.170.178
linux-image-generic-lpae - 4.4.0.170.178
linux-image-kvm - 4.4.0.1063.63
linux-image-lowlatency - 4.4.0.170.178
linux-image-powerpc-e500mc - 4.4.0.170.178
linux-image-powerpc-smp - 4.4.0.170.178
linux-image-powerpc64-emb - 4.4.0.170.178
linux-image-powerpc64-smp - 4.4.0.170.178
linux-image-raspi2 - 4.4.0.1126.126
linux-image-snapdragon - 4.4.0.1130.122
linux-image-virtual - 4.4.0.170.178
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-2018-20784
o CVE-2019-17075
o CVE-2019-17133
- --------------------------------------------------------------------------------
USN-4211-2: Linux kernel (Xenial HWE) vulnerabilities
3 December 2019
linux-lts-xenial, linux-aws vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 ESM
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-4211-1 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 ESM.
Zhipeng Xie discovered that an infinite loop could be triggered in the CFS
Linux kernel process scheduler. A local attacker could possibly use this to
cause a denial of service. (CVE-2018-20784)
Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel did
not properly validate SSID lengths. A physically proximate attacker could use
this to cause a denial of service (system crash). (CVE-2019-17133)
Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux
kernel performed DMA from a kernel stack. A local attacker could use this to
cause a denial of service (system crash). (CVE-2019-17075)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04 ESM
linux-image-4.4.0-1059-aws - 4.4.0-1059.63
linux-image-4.4.0-170-generic - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-generic-lpae - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-lowlatency - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc-e500mc - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc-smp - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc64-emb - 4.4.0-170.199~14.04.1
linux-image-4.4.0-170-powerpc64-smp - 4.4.0-170.199~14.04.1
linux-image-aws - 4.4.0.1059.60
linux-image-generic-lpae-lts-xenial - 4.4.0.170.149
linux-image-generic-lts-xenial - 4.4.0.170.149
linux-image-lowlatency-lts-xenial - 4.4.0.170.149
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.170.149
linux-image-powerpc-smp-lts-xenial - 4.4.0.170.149
linux-image-powerpc64-emb-lts-xenial - 4.4.0.170.149
linux-image-powerpc64-smp-lts-xenial - 4.4.0.170.149
linux-image-virtual-lts-xenial - 4.4.0.170.149
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-4211-1
o CVE-2018-20784
o CVE-2019-17075
o CVE-2019-17133
- --------------------------END INCLUDED TEXT--------------------
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