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Ubuntu Security Notice USN-4578-1

Ubuntu Security Notice USN-4578-1
Posted Oct 14, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4578-1 - 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 or possibly execute arbitrary code. Wen Xu discovered that the XFS file system in the Linux kernel did not properly validate inode metadata in some situations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2018-10322, CVE-2019-19448, CVE-2020-14314, CVE-2020-16119, CVE-2020-16120, CVE-2020-25212, CVE-2020-26088
MD5 | d9b01e11bdf2b74c3573fcc5c0826039

Ubuntu Security Notice USN-4578-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4578-1
October 14, 2020

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem,
linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

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-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oem: Linux kernel for OEM systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

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)

Wen Xu discovered that the XFS file system in the Linux kernel did not
properly validate inode metadata in some situations. An attacker could use
this to construct a malicious XFS image that, when mounted, could cause a
denial of service (system crash). (CVE-2018-10322)

It was discovered that the btrfs file system in the Linux kernel contained
a use-after-free vulnerability when merging free space. An attacker could
use this to construct a malicious btrfs image that, when mounted and
operated on, could cause a denial of service (system crash).
(CVE-2019-19448)

Jay Shin discovered that the ext4 file system implementation in the Linux
kernel did not properly handle directory access with broken indexing,
leading to an out-of-bounds read vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2020-14314)

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)

It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

It was discovered that the NFC implementation in the Linux kernel did not
properly perform permissions checks when opening raw sockets. A local
attacker could use this to create or listen to NFC traffic.
(CVE-2020-26088)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1057-oracle 4.15.0-1057.62
linux-image-4.15.0-1072-gke 4.15.0-1072.76
linux-image-4.15.0-1073-raspi2 4.15.0-1073.78
linux-image-4.15.0-1077-kvm 4.15.0-1077.79
linux-image-4.15.0-1086-aws 4.15.0-1086.91
linux-image-4.15.0-1086-gcp 4.15.0-1086.98
linux-image-4.15.0-1089-snapdragon 4.15.0-1089.98
linux-image-4.15.0-1099-azure 4.15.0-1099.110
linux-image-4.15.0-1099-oem 4.15.0-1099.109
linux-image-4.15.0-121-generic 4.15.0-121.123
linux-image-4.15.0-121-generic-lpae 4.15.0-121.123
linux-image-4.15.0-121-lowlatency 4.15.0-121.123
linux-image-aws-lts-18.04 4.15.0.1086.88
linux-image-azure-lts-18.04 4.15.0.1099.72
linux-image-gcp-lts-18.04 4.15.0.1086.104
linux-image-generic 4.15.0.121.108
linux-image-generic-lpae 4.15.0.121.108
linux-image-gke 4.15.0.1072.76
linux-image-gke-4.15 4.15.0.1072.76
linux-image-kvm 4.15.0.1077.73
linux-image-lowlatency 4.15.0.121.108
linux-image-oem 4.15.0.1099.103
linux-image-oracle-lts-18.04 4.15.0.1057.67
linux-image-powerpc-e500mc 4.15.0.121.108
linux-image-powerpc-smp 4.15.0.121.108
linux-image-powerpc64-emb 4.15.0.121.108
linux-image-powerpc64-smp 4.15.0.121.108
linux-image-raspi2 4.15.0.1073.70
linux-image-snapdragon 4.15.0.1089.92
linux-image-virtual 4.15.0.121.108

Ubuntu 16.04 LTS:
linux-image-4.15.0-1056-oracle 4.15.0-1056.61~16.04.1
linux-image-4.15.0-1085-aws 4.15.0-1085.90~16.04.1
linux-image-4.15.0-1086-gcp 4.15.0-1086.98~16.04.1
linux-image-4.15.0-1098-azure 4.15.0-1098.109~16.04.1
linux-image-4.15.0-120-generic 4.15.0-120.122~16.04.1
linux-image-4.15.0-120-generic-lpae 4.15.0-120.122~16.04.1
linux-image-4.15.0-120-lowlatency 4.15.0-120.122~16.04.1
linux-image-aws-hwe 4.15.0.1085.81
linux-image-azure 4.15.0.1098.92
linux-image-gcp 4.15.0.1086.87
linux-image-generic-hwe-16.04 4.15.0.120.121
linux-image-generic-lpae-hwe-16.04 4.15.0.120.121
linux-image-gke 4.15.0.1086.87
linux-image-lowlatency-hwe-16.04 4.15.0.120.121
linux-image-oem 4.15.0.120.121
linux-image-oracle 4.15.0.1056.46
linux-image-virtual-hwe-16.04 4.15.0.120.121

Ubuntu 14.04 ESM:
linux-image-4.15.0-1098-azure 4.15.0-1098.109~14.04.1
linux-image-azure 4.15.0.1098.74

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/4578-1
CVE-2018-10322, CVE-2019-19448, CVE-2020-14314, CVE-2020-16119,
CVE-2020-16120, CVE-2020-25212, CVE-2020-26088

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-121.123
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1086.91
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1099.110
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1086.98
https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1072.76
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1077.79
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1099.109
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1057.62
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1073.78
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1089.98
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1085.90~16.04.1
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1098.109~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1086.98~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-120.122~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1056.61~16.04.1
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