Tuesday, June 9, 2020

USN-4389-1: Linux kernel vulnerabilities

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 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

Details

It was discovered that the F2FS file system implementation in the Linux kernel did not properly perform bounds checking on xattrs in some situations. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-0067)

It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. (CVE-2020-0543)

Piotr Krysiuk discovered that race conditions existed in the file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-12114)

It was discovered that the USB susbsystem’s scatter-gather implementation in the Linux kernel did not properly take data references in some situations, leading to a use-after-free. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-12464)

Bui Quang Minh discovered that the XDP socket implementation in the Linux kernel did not properly validate meta-data passed from user space, leading to an out-of-bounds write vulnerability. A local attacker with the CAP_NET_ADMIN capability could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-12659)

Dmitry Vyukov discovered that the SELinux netlink security hook in the Linux kernel did not validate messages in some situations. A privileged attacker could use this to bypass SELinux netlink restrictions. (CVE-2020-10751)

Update instructions

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

Ubuntu 20.04 LTS
linux-image-5.4.0-1015-aws - 5.4.0-1015.15
linux-image-5.4.0-1015-gcp - 5.4.0-1015.15
linux-image-5.4.0-1015-kvm - 5.4.0-1015.15
linux-image-5.4.0-1015-oracle - 5.4.0-1015.15
linux-image-5.4.0-1016-azure - 5.4.0-1016.16
linux-image-5.4.0-37-generic - 5.4.0-37.41
linux-image-5.4.0-37-generic-lpae - 5.4.0-37.41
linux-image-5.4.0-37-lowlatency - 5.4.0-37.41
linux-image-aws - 5.4.0.1015.16
linux-image-azure - 5.4.0.1016.16
linux-image-gcp - 5.4.0.1015.14
linux-image-generic - 5.4.0.37.40
linux-image-generic-hwe-20.04 - 5.4.0.37.40
linux-image-generic-lpae - 5.4.0.37.40
linux-image-generic-lpae-hwe-20.04 - 5.4.0.37.40
linux-image-gke - 5.4.0.1015.14
linux-image-kvm - 5.4.0.1015.14
linux-image-lowlatency - 5.4.0.37.40
linux-image-lowlatency-hwe-20.04 - 5.4.0.37.40
linux-image-oem - 5.4.0.37.40
linux-image-oem-osp1 - 5.4.0.37.40
linux-image-oracle - 5.4.0.1015.14
linux-image-virtual - 5.4.0.37.40
linux-image-virtual-hwe-20.04 - 5.4.0.37.40

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that the mitigation for CVE-2020-0543 requires a processor microcode update to be applied, either from your system manufacturer or via the intel-microcode package. The kernel update for this issue provides the ability to disable the mitigation and to report vulnerability status.

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



from Ubuntu Security Notices https://ift.tt/3hbeAl9
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