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AUSCERT External Security Bulletin Redistribution
ESB-2020.3012
USN-4486-1: Linux kernel vulnerability
2 September 2020
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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-2018-10323
Reference: ESB-2018.3020
ESB-2018.2515.3
ESB-2018.1335
Original Bulletin:
https://usn.ubuntu.com/4486-1/
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USN-4486-1: Linux kernel vulnerability
02 September 2020
The Linux kernel could be made to crash if it mounted a malicious XFS
file system.
Releases
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
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-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Wen Xu discovered that the XFS filesystem implementation in the Linux
kernel did not properly validate meta-data information. An attacker could
use this to construct a malicious xfs image that, when mounted, could cause
a denial of service (system crash).
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o linux-image-4.4.0-1079-kvm - 4.4.0-1079.86
o linux-image-4.4.0-1113-aws - 4.4.0-1113.126
o linux-image-4.4.0-1138-raspi2 - 4.4.0-1138.147
o linux-image-4.4.0-1142-snapdragon - 4.4.0-1142.151
o linux-image-4.4.0-189-generic - 4.4.0-189.219
o linux-image-4.4.0-189-generic-lpae - 4.4.0-189.219
o linux-image-4.4.0-189-lowlatency - 4.4.0-189.219
o linux-image-4.4.0-189-powerpc-e500mc - 4.4.0-189.219
o linux-image-4.4.0-189-powerpc-smp - 4.4.0-189.219
o linux-image-4.4.0-189-powerpc64-emb - 4.4.0-189.219
o linux-image-4.4.0-189-powerpc64-smp - 4.4.0-189.219
o linux-image-aws - 4.4.0.1113.118
o linux-image-generic - 4.4.0.189.195
o linux-image-generic-lpae - 4.4.0.189.195
o linux-image-kvm - 4.4.0.1079.77
o linux-image-lowlatency - 4.4.0.189.195
o linux-image-powerpc-e500mc - 4.4.0.189.195
o linux-image-powerpc-smp - 4.4.0.189.195
o linux-image-powerpc64-emb - 4.4.0.189.195
o linux-image-powerpc64-smp - 4.4.0.189.195
o linux-image-raspi2 - 4.4.0.1138.138
o linux-image-snapdragon - 4.4.0.1142.134
o linux-image-virtual - 4.4.0.189.195
Ubuntu 14.04
o linux-image-4.4.0-1077-aws - 4.4.0-1077.81
o linux-image-4.4.0-189-generic - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-generic-lpae - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-lowlatency - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-powerpc-e500mc - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-powerpc-smp - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-powerpc64-emb - 4.4.0-189.219~14.04.1
o linux-image-4.4.0-189-powerpc64-smp - 4.4.0-189.219~14.04.1
o linux-image-aws - 4.4.0.1077.74
o linux-image-generic-lpae-lts-xenial - 4.4.0.189.165
o linux-image-generic-lts-xenial - 4.4.0.189.165
o linux-image-lowlatency-lts-xenial - 4.4.0.189.165
o linux-image-powerpc-e500mc-lts-xenial - 4.4.0.189.165
o linux-image-powerpc-smp-lts-xenial - 4.4.0.189.165
o linux-image-powerpc64-emb-lts-xenial - 4.4.0.189.165
o linux-image-powerpc64-smp-lts-xenial - 4.4.0.189.165
o linux-image-virtual-lts-xenial - 4.4.0.189.165
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-2018-10323
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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
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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
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from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
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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.
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