Jwt Attack
CVE-2020-15705
MEDIUM
Severity by source
AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. Rated medium severity (CVSS 6.4).
Technical ContextAI
This vulnerability is classified under CWE-347. 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.04 and prior versions. Affected products include: Gnu Grub2, Redhat Enterprise Linux Atomic Host, Redhat Openshift Container Platform, Canonical Ubuntu Linux, Debian Debian Linux. Version information: version 2.04.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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External POC / Exploit Code
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