medium
6.4
CWE
416 362
Advisory Published
CVE Published
CVE Published
Updated

CVE-2020-15706: GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.

First published: Mon Jul 27 2020(Updated: )

"grub2 contains a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing."

Credit: security@ubuntu.com

Affected SoftwareAffected VersionHow to fix
redhat/fwupdate<0:12-6.el7_8
0:12-6.el7_8
redhat/grub2<1:2.02-0.86.el7_8
1:2.02-0.86.el7_8
redhat/shim<0:15-7.el7_9
0:15-7.el7_9
redhat/shim-signed<0:15-7.el7_8
0:15-7.el7_8
redhat/grub2<1:2.02-0.86.el7_2
1:2.02-0.86.el7_2
redhat/shim<0:15-8.el7
0:15-8.el7
redhat/shim-signed<0:15-8.el7_2
0:15-8.el7_2
redhat/grub2<1:2.02-0.86.el7
1:2.02-0.86.el7
redhat/shim-signed<0:15-8.el7_3
0:15-8.el7_3
redhat/fwupdate<0:9-10.el7_4
0:9-10.el7_4
redhat/grub2<1:2.02-0.86.el7_4
1:2.02-0.86.el7_4
redhat/shim-signed<0:15-8.el7_4
0:15-8.el7_4
redhat/fwupdate<0:12-6.el7_6
0:12-6.el7_6
redhat/grub2<1:2.02-0.86.el7_6
1:2.02-0.86.el7_6
redhat/shim-signed<0:15-8.el7_6
0:15-8.el7_6
redhat/fwupdate<0:12-6.el7_7
0:12-6.el7_7
redhat/grub2<1:2.02-0.86.el7_7
1:2.02-0.86.el7_7
redhat/shim-signed<0:15-8.el7_7
0:15-8.el7_7
redhat/fwupd<0:1.1.4-7.el8_2
0:1.1.4-7.el8_2
redhat/grub2<1:2.02-87.el8_2
1:2.02-87.el8_2
redhat/shim<0:15-14.el8_2
0:15-14.el8_2
redhat/shim-unsigned-x64<0:15-7.el8
0:15-7.el8
redhat/fwupd<0:1.1.4-2.el8_0
0:1.1.4-2.el8_0
redhat/grub2<1:2.02-87.el8_0
1:2.02-87.el8_0
redhat/shim<0:15-14.el8_0
0:15-14.el8_0
redhat/fwupd<0:1.1.4-2.el8_1
0:1.1.4-2.el8_1
redhat/grub2<1:2.02-87.el8_1
1:2.02-87.el8_1
redhat/shim<0:15-14.el8_1
0:15-14.el8_1
redhat/grub<2.06
2.06
debian/grub2
2.06-3~deb11u6
2.06-13+deb12u1
2.12-5
GRUB 2<=2.04
Red Hat Enterprise Linux Atomic Host
redhat openshift container platform=4.0
Ubuntu Linux=14.04
Ubuntu Linux=16.04
Ubuntu Linux=18.04
Ubuntu Linux=20.04
Debian GNU/Linux=10.0
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
SUSE Linux Enterprise Server=11
SUSE Linux Enterprise Server=12
SUSE Linux Enterprise Server=15
Microsoft Windows 10
Microsoft Windows 10=1607
Microsoft Windows 10=1709
Microsoft Windows 10=1803
Microsoft Windows 10=1809
Microsoft Windows 10=1903
Microsoft Windows 10=1909
Microsoft Windows 10=2004
Microsoft Windows 8.1
Microsoft Windows RT
Microsoft Windows Server 2012 x64
Microsoft Windows Server 2012 x64=r2
Microsoft Windows Server 2016
Microsoft Windows Server 2016=1903
Microsoft Windows Server 2016=1909
Microsoft Windows Server 2016=2004
Microsoft Windows Server 2019
openSUSE=15.1
openSUSE=15.2
Ubuntu Linux=16.04
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=20.04
Debian=10.0
Ubuntu=16.04

Remedy

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-15706?

    CVE-2020-15706 is rated as a medium severity vulnerability due to the potential for exploitation leading to use-after-free conditions.

  • How do I fix CVE-2020-15706?

    To remediate CVE-2020-15706, update to the patched versions of grub2, shim, and other affected packages as specified by your Linux distribution.

  • Which affected software versions are impacted by CVE-2020-15706?

    CVE-2020-15706 impacts several versions of grub2, fwupdate, shim, and shim-signed on Red Hat and other Linux distributions.

  • What type of vulnerability is CVE-2020-15706?

    CVE-2020-15706 is a use-after-free vulnerability caused by a race condition in the grub_script_function_create() function.

  • Who is affected by CVE-2020-15706?

    Users of affected versions of grub2 and related packages on Red Hat and other Linux distributions are at risk from CVE-2020-15706.

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