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    CVE-2020-15705

    GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

    Published:Jul 29, 2020
    Last Modified:Nov 21, 2024
    EPS:Jul 29, 2020
    EPSS Score:0.00024
    CVSS Score:6.4

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Gnu
    Product
    Grub2
    Vendor
    Microsoft
    Product
    Windows 10
    Vendor
    Microsoft
    Product
    Windows 8.1
    Vendor
    Microsoft
    Product
    Windows Rt 8.1
    Vendor
    Microsoft
    Product
    Windows Server 2012
    Vendor
    Microsoft
    Product
    Windows Server 2016
    Vendor
    Microsoft
    Product
    Windows Server 2019
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Atomic Host
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Suse
    Product
    Suse Linux Enterprise Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

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    References

    http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
    http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
    http://ubuntu.com/security/notices/USN-4432-1
    http://www.openwall.com/lists/oss-security/2020/07/29/3
    http://www.openwall.com/lists/oss-security/2021/03/02/3
    http://www.openwall.com/lists/oss-security/2021/09/17/2
    http://www.openwall.com/lists/oss-security/2021/09/17/4
    http://www.openwall.com/lists/oss-security/2021/09/21/1
    https://access.redhat.com/security/vulnerabilities/grub2bootloader
    https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
    https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
    https://security.gentoo.org/glsa/202104-05
    https://security.netapp.com/advisory/ntap-20200731-0008/
    https://usn.ubuntu.com/4432-1/
    https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
    https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
    https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
    https://www.openwall.com/lists/oss-security/2020/07/29/3
    https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
    https://www.suse.com/support/kb/doc/?id=000019673
    http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
    http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
    http://ubuntu.com/security/notices/USN-4432-1
    http://www.openwall.com/lists/oss-security/2020/07/29/3
    http://www.openwall.com/lists/oss-security/2021/03/02/3
    http://www.openwall.com/lists/oss-security/2021/09/17/2
    http://www.openwall.com/lists/oss-security/2021/09/17/4
    http://www.openwall.com/lists/oss-security/2021/09/21/1
    https://access.redhat.com/security/vulnerabilities/grub2bootloader
    https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
    https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
    https://security.gentoo.org/glsa/202104-05
    https://security.netapp.com/advisory/ntap-20200731-0008/
    https://usn.ubuntu.com/4432-1/
    https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
    https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
    https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
    https://www.openwall.com/lists/oss-security/2020/07/29/3
    https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
    https://www.suse.com/support/kb/doc/?id=000019673

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High