Is CVE-2020-15705 in the CISA KEV catalog?

No. CVE-2020-15705 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-15705?

CVE-2020-15705 has a CVSS v3 base score of 6.4 (MEDIUM).

What is the EPSS score for CVE-2020-15705?

CVE-2020-15705 has an EPSS score of 1.43% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-15705?

Upgrade grub-efi-amd64-bin on ubuntu 14.04 to 2.02~beta2-9ubuntu1.20 or later. Fixes are available for 8 affected products.

CVE & CISA-KEV Catalog

CVE-2020-15705

MEDIUM

6.4

CVSS v3

NVD

Description

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.

CWE-347

How to fix

Remediation Available

grub-efi-amd64-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-amd64-signedUbuntu

Fixed in:1.34.22+2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1

Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1

grub-efi-arm-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-arm64-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-arm64-signedUbuntu

Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1

Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1

grub-efi-ia32-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub2Ubuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub2-signedUbuntu

Fixed in:1.34.22USN-4432-1

Fixed in:1.66.26USN-4432-1

Fixed in:1.93.18USN-4432-1

Fixed in:1.142.3USN-4432-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.43%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.