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Ubuntu 18.04 LTS: USN-4577-1 Critical: Kernel DoS and Execution Flaws

ubuntu
Calendar Grey October 13, 2020
Dist Ubuntu Esm H88
Multiple vulnerabilities in the Debian kernel were addressed, impacting local environments and necessitating prompt upgrades.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems

- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

- linux-oem-osp1: Linux kernel for OEM systems

- linux-raspi2-5.3: Linux kernel for Raspberry Pi (V8) systems

Details:

Hador Manor discovered that the DCCP protocol implementation in the Linux

kernel improperly handled socket reuse, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2020-16119)

Giuseppe Scrivano discovered that the overlay file system in the Linux

kernel did not properly perform permission checks in some situations. A

local attacker could possibly use this to bypass intended restrictions and

gain read access to restricted files. (CVE-2020-16120)

Topics%20covered

Topics Covered

security advisory DoS kernel patch Ubuntu local attack execution malicious access

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1049-gke      5.0.0-1049.50
  linux-image-5.0.0-1069-oem-osp1  5.0.0-1069.75
  linux-image-5.3.0-1035-raspi2   5.3.0-1035.37
  linux-image-5.3.0-1038-gke      5.3.0-1038.40
  linux-image-5.3.0-68-generic    5.3.0-68.63
  linux-image-5.3.0-68-lowlatency  5.3.0-68.63
  linux-image-gke-5.0             5.0.0.1049.33
  linux-image-gke-5.3             5.3.0.1038.21
  linux-image-gkeop-5.3           5.3.0.68.125
  linux-image-oem-osp1            5.0.0.1069.67
  linux-image-raspi2-hwe-18.04    5.3.0.1035.24

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://ubuntu.com/security/notices/USN-4577-1

CVE-2020-16119, CVE-2020-16120

Severity
critical
Lowest
Low
Medium
High
Critical

October 14, 2020

Topics%20covered

Topics Covered

security advisory DoS kernel patch Ubuntu local attack execution malicious access

Package Information

https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1038.40
https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-68.63
https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1069.75

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