CVE-2020-15705 (GCVE-0-2020-15705)

Vulnerability from cvelistv5 – Published: 2020-07-29 17:45 – Updated: 2024-09-17 00:06
VLAI
Title
GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
Summary
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.
Severity
6.4 (Medium)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
URL Tags
https://www.eclypsium.com/2020/07/29/theres-a-hol… x_refsource_CONFIRM
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBas… vendor-advisoryx_refsource_UBUNTU
http://ubuntu.com/security/notices/USN-4432-1 vendor-advisoryx_refsource_UBUNTU
https://www.debian.org/security/2020-GRUB-UEFI-Se… vendor-advisoryx_refsource_DEBIAN
https://portal.msrc.microsoft.com/en-US/security-… x_refsource_CONFIRM
https://access.redhat.com/security/vulnerabilitie… vendor-advisoryx_refsource_REDHAT
https://www.suse.com/c/suse-addresses-grub2-secur… vendor-advisoryx_refsource_SUSE
https://www.suse.com/support/kb/doc/?id=000019673 vendor-advisoryx_refsource_SUSE
https://www.openwall.com/lists/oss-security/2020/… x_refsource_CONFIRM
https://lists.gnu.org/archive/html/grub-devel/202… x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2020/07/29/3 mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2020073… x_refsource_CONFIRM
https://usn.ubuntu.com/4432-1/ vendor-advisoryx_refsource_UBUNTU
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://www.openwall.com/lists/oss-security/2021/03/02/3 mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202104-05 vendor-advisoryx_refsource_GENTOO
http://www.openwall.com/lists/oss-security/2021/09/17/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/09/17/4 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/09/21/1 mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version
Ubuntu grub2 in Ubuntu Affected: 20.04 LTS , < 2.04-1ubuntu26.1 (custom)
Affected: 18.04 LTS , < 2.02-2ubuntu8.16 (custom)
Affected: 16.04 LTS , < 2.02~beta2-36ubuntu3.26 (custom)
Affected: 14.04 ESM , < 2.02~beta2-9ubuntu1.20 (custom)
Create a notification for this product.
Date Public
2020-07-29 00:00
Credits
Mathieu Trudel-Lapierre
Show details on NVD website
To clipboard 

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          ],
          "discovery": "INTERNAL"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2020-15705",
    "datePublished": "2020-07-29T17:45:33.422Z",
    "dateReserved": "2020-07-14T00:00:00.000Z",
    "dateUpdated": "2024-09-17T00:06:01.169Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2020-15705",
      "date": "2026-05-27",
      "epss": "0.00024",
      "percentile": "0.06932"
    },
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Esto solo afecta a los sistemas en los que el certificado de firma del kernel ha sido importado directamente a la base de datos de arranque seguro y la imagen de GRUB es iniciada directamente sin el uso de cu\u00f1a. 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  }
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.