--===============2493401355592073657==
Content-Type: multipart/signed; micalg=pgp-sha512;
protocol="application/pgp-signature";
boundary="wchHw8dVAp53YPj8"
Content-Disposition: inline
--wchHw8dVAp53YPj8
Content-Type: text/plain; charset=utf-8
Content-Disposition: inlin
Content-Transfer-Encoding: quoted-printable
==========================================================================
Ubuntu Security Notice USN-4679-1
January 06, 2021
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp,
linux-gcp-5.4, linux-gke-5.4, linux-hwe-5.4, linux-kvm, linux-oracle,
linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems
Details:
It was discovered that the console keyboard driver in the Linux kernel
contained a race condition. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-25656)
Minh Yuan discovered that the tty driver in the Linux kernel contained race
conditions when handling fonts. A local attacker could possibly use this to
expose sensitive information (kernel memory). (CVE-2020-25668)
Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
(CVE-2020-25704)
Jinoh Kang discovered that the Xen event channel infrastructure in the
Linux kernel contained a race condition. An attacker in guest could
possibly use this to cause a denial of service (dom0 crash).
(CVE-2020-27675)
Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
(CVE-2020-27777)
Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory). (CVE-2020-28974)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
linux-image-5.4.0-1026-raspi 5.4.0-1026.29
linux-image-5.4.0-1031-kvm 5.4.0-1031.32
linux-image-5.4.0-1033-gcp 5.4.0-1033.35
linux-image-5.4.0-1034-aws 5.4.0-1034.35
linux-image-5.4.0-1034-oracle 5.4.0-1034.36
linux-image-5.4.0-1035-azure 5.4.0-1035.36
linux-image-5.4.0-59-generic 5.4.0-59.65
linux-image-5.4.0-59-generic-lpae 5.4.0-59.65
linux-image-5.4.0-59-lowlatency 5.4.0-59.65
linux-image-aws 5.4.0.1034.35
linux-image-azure 5.4.0.1035.33
linux-image-gcp 5.4.0.1033.42
linux-image-generic 5.4.0.59.62
linux-image-generic-lpae 5.4.0.59.62
linux-image-kvm 5.4.0.1031.29
linux-image-lowlatency 5.4.0.59.62
linux-image-oem 5.4.0.59.62
linux-image-oem-osp1 5.4.0.59.62
linux-image-oracle 5.4.0.1034.31
linux-image-raspi 5.4.0.1026.61
linux-image-raspi2 5.4.0.1026.61
linux-image-virtual 5.4.0.59.62
Ubuntu 18.04 LTS:
linux-image-5.4.0-1026-raspi 5.4.0-1026.29~18.04.1
linux-image-5.4.0-1033-gcp 5.4.0-1033.35~18.04.1
linux-image-5.4.0-1033-gke 5.4.0-1033.35~18.04.1
linux-image-5.4.0-1034-aws 5.4.0-1034.35~18.04.1
linux-image-5.4.0-1034-oracle 5.4.0-1034.36~18.04.1
linux-image-5.4.0-1035-azure 5.4.0-1035.36~18.04.1
linux-image-5.4.0-59-generic 5.4.0-59.65~18.04.1
linux-image-5.4.0-59-generic-lpae 5.4.0-59.65~18.04.1
linux-image-5.4.0-59-lowlatency 5.4.0-59.65~18.04.1
linux-image-aws 5.4.0.1034.19
linux-image-azure 5.4.0.1035.17
linux-image-gcp 5.4.0.1033.21
linux-image-generic-hwe-18.04 5.4.0.59.65~18.04.54
linux-image-generic-lpae-hwe-18.04 5.4.0.59.65~18.04.54
linux-image-gke-5.4 5.4.0.1033.35~18.04.2
linux-image-lowlatency-hwe-18.04 5.4.0.59.65~18.04.54
linux-image-oem 5.4.0.59.65~18.04.54
linux-image-oem-osp1 5.4.0.59.65~18.04.54
linux-image-oracle 5.4.0.1034.36~18.04.18
linux-image-raspi-hwe-18.04 5.4.0.1026.30
linux-image-snapdragon-hwe-18.04 5.4.0.59.65~18.04.54
linux-image-virtual-hwe-18.04 5.4.0.59.65~18.04.54
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:
https://usn.ubuntu.com/4679-1
CVE-2020-25656, CVE-2020-25668, CVE-2020-25704, CVE-2020-27675,
CVE-2020-27777, CVE-2020-28974
Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-59.65
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1034.35
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1035.36
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1033.35
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1031.32
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1034.36
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1026.29
https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1034.35~18.04.1
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1035.36~18.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1033.35~18.04.1
https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1033.35~18.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-59.65~18.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1034.36~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1026.29~18.04.1
--wchHw8dVAp53YPj8
Content-Type: application/pgp-signature; name="signature.asc"
-----BEGIN PGP SIGNATURE-----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=a8PP
-----END PGP SIGNATURE-----
--wchHw8dVAp53YPj8--
--===============2493401355592073657==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline
LS0gCnVidW50dS1zZWN1cml0eS1hbm5vdW5jZSBtYWlsaW5nIGxpc3QKdWJ1bnR1LXNlY3VyaXR5
LWFubm91bmNlQGxpc3RzLnVidW50dS5jb20KTW9kaWZ5IHNldHRpbmdzIG9yIHVuc3Vic2NyaWJl
IGF0OiBodHRwczovL2xpc3RzLnVidW50dS5jb20vbWFpbG1hbi9saXN0aW5mby91YnVudHUtc2Vj
dXJpdHktYW5ub3VuY2UK
--===============2493401355592073657==--
|
