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Vulnerability of GRUB2: buffer overflow via grub.cfg, BootHole

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via grub.cfg of GRUB2, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, Fedora, Windows 10, Windows 2012, Windows 2016, Windows 2019, Windows 8, Windows RT, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive.
Severity of this alert: 1/4.
Creation date: 30/07/2020.
Références of this alert: ADV200011, BootHole, CERTFR-2020-AVI-475, CERTFR-2020-AVI-476, CERTFR-2020-AVI-477, CERTFR-2020-AVI-485, CVE-2020-10713, DSA-4735-1, DSA-4735-2, FEDORA-2020-41e57d7649, FEDORA-2020-e19b87f4f5, openSUSE-SU-2020:1168-1, openSUSE-SU-2020:1169-1, openSUSE-SU-2020:1190-1, openSUSE-SU-2020:1196-1, RHSA-2020:3216-01, RHSA-2020:3217-01, RHSA-2020:3223-01, RHSA-2020:3227-01, RHSA-2020:3271-01, RHSA-2020:3273-01, RHSA-2020:3274-01, RHSA-2020:3275-01, RHSA-2020:3276-01, SUSE-SU-2020:14440-1, SUSE-SU-2020:14490-1, SUSE-SU-2020:2073-1, SUSE-SU-2020:2074-1, SUSE-SU-2020:2076-1, SUSE-SU-2020:2077-1, SUSE-SU-2020:2078-1, SUSE-SU-2020:2079-1, SUSE-SU-2020:2158-1, SUSE-SU-2020:2159-1, SUSE-SU-2020:2160-1, SUSE-SU-2020:2166-1, SUSE-SU-2020:2626-1, SUSE-SU-2020:2627-1, SUSE-SU-2020:2628-1, SUSE-SU-2020:2629-1, USN-4432-1, USN-4432-2, VIGILANCE-VUL-32951, VU#174059.

Description of the vulnerability 

An attacker can trigger a buffer overflow via grub.cfg of GRUB2, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity announce impacts software or systems such as Debian, Fedora, Windows 10, Windows 2012, Windows 2016, Windows 2019, Windows 8, Windows RT, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this threat alert is low.

The trust level is of type confirmed by the editor, with an origin of physical access.

An attacker with a expert ability can exploit this computer weakness alert.

Solutions for this threat 

GRUB2: patch for BootHole.
A patch is available:
  http://git.savannah.gnu.org/gitweb/?p=grub.git&view=view+git+repository
  https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
Information sources indicates additional steps.

Debian 10: new grub2 packages.
New packages are available:
  Debian 10: grub2 2.02+dfsg1-20+deb10u2

Fedora 31: new grub2 packages.
New packages are available:
  Fedora 31: grub2 2.02-110.fc31

Fedora 32: new grub2 packages.
New packages are available:
  Fedora 32: grub2 2.04-22.fc32

openSUSE Leap 15.1: new xen packages.
New packages are available:
  openSUSE Leap 15.1: xen 4.12.3_06-lp151.2.24.1

openSUSE Leap 15.2: new xen packages.
New packages are available:
  openSUSE Leap 15.2: xen 4.13.1_06-lp152.2.6.1

openSUSE Leap 15: new grub2 packages.
New packages are available:
  openSUSE Leap 15.1: grub2 2.02-lp151.21.21.4
  openSUSE Leap 15.2: grub2 2.04-lp152.7.3.4

RHEL: new grub2 packages.
New packages are available:
  RHEL 7.2: grub2 2.02-0.86.el7_2
  RHEL 7.3: grub2 2.02-0.86.el7
  RHEL 7.4: grub2 2.02-0.86.el7_4
  RHEL 7.6: grub2 2.02-0.86.el7_6
  RHEL 7.7: grub2 2.02-0.86.el7_7
  RHEL 7.8: grub2 2.02-0.86.el7_8
  RHEL 8.0: grub2 2.02-87.el8_0
  RHEL 8.1: grub2 2.02-87.el8_1
  RHEL 8.2: grub2 2.02-87.el8_2

SUSE LE 11 SP4: new shim packages.
New packages are available:
  SUSE LE 11 SP4: shim 15+git47-12.5.1

SUSE LE 12 SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP5: xen 4.12.3_06-3.21.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_14-3.38.1
  SUSE LE 15 SP1: xen 4.12.3_06-3.25.1
  SUSE LE 15 SP2: xen 4.13.1_06-3.7.1

SUSE LE: new grub2 packages.
New packages are available:
  SUSE LE 11 SP4: grub2 2.00-0.66.15.1
  SUSE LE 12 SP2: grub2 2.02~beta2-115.49.1
  SUSE LE 12 SP3: grub2 2.02-4.53.1
  SUSE LE 12 SP4: grub2 2.02-12.31.1
  SUSE LE 12 SP5: grub2 2.02-12.31.1
  SUSE LE 15 RTM: grub2 2.02-19.48.1
  SUSE LE 15 SP1: grub2 2.02-26.25.1
  SUSE LE 15 SP2: grub2 2.04-9.7.1

SUSE LE: new shim packages.
New packages are available:
  SUSE LE 12 SP2: shim 15+git47-22.8.1
  SUSE LE 12 SP3: shim 15+git47-25.11.1
  SUSE LE 12 SP4: shim 15+git47-25.11.1
  SUSE LE 12 SP5: shim 15+git47-25.11.1
  SUSE LE 15 RTM: shim 15+git47-7.15.1
  SUSE LE 15 SP1: shim 15+git47-3.8.1
  SUSE LE 15 SP2: shim 15+git47-3.8.1

Ubuntu: new grub packages.
New packages are available:
  Ubuntu 20.04 LTS: grub 2.04-1ubuntu26.2
  Ubuntu 18.04 LTS: grub 2.02-2ubuntu8.17
  Ubuntu 16.04 LTS: grub 2.02~beta2-36ubuntu3.27
  Ubuntu 14.04 ESM: grub 2.02~beta2-9ubuntu1.17-or-21

Windows: solution for BootHole.
The solution is indicated in information sources.
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