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Vulnerability of Linux kernel: read-write access via Nfsd No-ACL Unapplied Umask

Synthesis of the vulnerability 

An attacker can bypass access restrictions via Nfsd No-ACL Unapplied Umask of the Linux kernel, in order to read or alter data.
Impacted software: Tivoli Storage Manager, Junos Space, Junos Space Network Management Platform, Linux, openSUSE Leap, Oracle Communications, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 20/08/2020.
Références of this announce: 6417119, CERTFR-2020-AVI-541, CERTFR-2020-AVI-548, CERTFR-2020-AVI-553, CERTFR-2020-AVI-568, CERTFR-2020-AVI-574, CERTFR-2020-AVI-823, CERTFR-2021-AVI-122, CERTFR-2021-AVI-184, CERTFR-2021-AVI-201, cpuapr2021, CVE-2020-24394, JSA11174, JSA11176, openSUSE-SU-2020:1325-1, RHSA-2020:5437-01, RHSA-2020:5441-01, RHSA-2021:0526-01, RHSA-2021:0760-01, RHSA-2021:0878-01, SUSE-SU-2020:2540-1, SUSE-SU-2020:2541-1, SUSE-SU-2020:2574-1, SUSE-SU-2020:2575-1, SUSE-SU-2020:2605-1, SUSE-SU-2020:2610-1, SUSE-SU-2020:2623-1, SUSE-SU-2020:2631-1, USN-4483-1, USN-4485-1, VIGILANCE-VUL-33124.

Description of the vulnerability 

An attacker can bypass access restrictions via Nfsd No-ACL Unapplied Umask of the Linux kernel, in order to read or alter data.
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This security bulletin impacts software or systems such as Tivoli Storage Manager, Junos Space, Junos Space Network Management Platform, Linux, openSUSE Leap, Oracle Communications, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat 

Linux kernel: version 5.4.51.
The version 5.4.51 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.7.8.
The version 5.7.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.132.
The version 4.19.132 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.188.
The version 4.14.188 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for Nfsd No-ACL Unapplied Umask.
A patch is indicated in information sources.

IBM Spectrum Protect Plus: patch for Linux Kernel.
A patch is indicated in information sources.

Junos Space: version 21.1R1.
The version 21.1R1 is fixed:
  https://support.juniper.net/support/downloads/
The version fixes more than 450 vulnerabilities, but only the 100 recent vulnerabilities were associated to this bulletin.

openSUSE Leap 15.1: new kernel packages (03/09/2020).
New packages are available:
  openSUSE Leap 15.1: kernel debug-4.12.14-lp151.28.63.1

Oracle Communications: CPU of April 2021.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=2766613.1
  https://support.oracle.com/rs?type=doc&id=2765939.1
  https://support.oracle.com/rs?type=doc&id=2765941.1
  https://support.oracle.com/rs?type=doc&id=2652618.1
  https://support.oracle.com/rs?type=doc&id=2765926.1
  https://support.oracle.com/rs?type=doc&id=2766616.1
  https://support.oracle.com/rs?type=doc&id=2765925.1
  https://support.oracle.com/rs?type=doc&id=2769144.1
  https://support.oracle.com/rs?type=doc&id=2766633.1
  https://support.oracle.com/rs?type=doc&id=2766634.1
  https://support.oracle.com/rs?type=doc&id=2739349.1
  https://support.oracle.com/rs?type=doc&id=2765938.1
  https://support.oracle.com/rs?type=doc&id=2766637.1

RHEL 7.4: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-693.82.1.el7

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-957.70.1.el7

RHEL 7.7: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-1062.45.1.el7

RHEL 7.9: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-1160.11.1.el7

RHEL 7.9: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.9: kernel-rt 3.10.0-1160.11.1.rt56.1145.el7

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.60.1

SUSE LE 12 SP5: new kernel-azure packages (07/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.25.1

SUSE LE 12 SP5: new kernel packages (08/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.37.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.16.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.58.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.41.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.56.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.31.1

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1093.70
  Ubuntu 16.04 LTS: linux-image-gcp 4.15.0.1081.83
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.115.103

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.4.0.1022.9
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.45.49
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