UBUNTU-CVE-2020-27749

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Source
https://ubuntu.com/security/CVE-2020-27749
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-27749.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-27749
Related
Published
2021-03-02T18:00:00Z
Modified
2024-10-15T14:07:44Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • 6.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

References

Affected packages

Ubuntu:Pro:14.04:LTS / grub2-signed

Package

Name
grub2-signed
Purl
pkg:deb/ubuntu/grub2-signed?arch=src?distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.22
1.23
1.24
1.25
1.26
1.27
1.30
1.31
1.32
1.33
1.34
1.34.1
1.34.2
1.34.3
1.34.4
1.34.5
1.34.6
1.34.7
1.34.8
1.34.9
1.34.13
1.34.14
1.34.16
1.34.17
1.34.18
1.34.20
1.34.22
1.34.24

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:18.04:LTS / grub2-signed

Package

Name
grub2-signed
Purl
pkg:deb/ubuntu/grub2-signed?arch=src?distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.167~18.04.5

Affected versions

1.*

1.85
1.86
1.87
1.89
1.91
1.92
1.93
1.93.1
1.93.2
1.93.3
1.93.4
1.93.5
1.93.7
1.93.8
1.93.10
1.93.11
1.93.13
1.93.14
1.93.15
1.93.16
1.93.18
1.93.19
1.93.20
1.93.21
1.93.22
1.93.24
1.167~18.04.1
1.167~18.04.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-amd64-signed"
        },
        {
            "binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-arm64-signed"
        }
    ]
}

Ubuntu:18.04:LTS / grub2-unsigned

Package

Name
grub2-unsigned
Purl
pkg:deb/ubuntu/grub2-unsigned?arch=src?distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.04-1ubuntu44.1.2

Affected versions

2.*

2.04-1ubuntu44
2.04-1ubuntu44.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-amd64"
        },
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-amd64-bin"
        },
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-amd64-dbg"
        },
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-arm64"
        },
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-arm64-bin"
        },
        {
            "binary_version": "2.04-1ubuntu44.1.2",
            "binary_name": "grub-efi-arm64-dbg"
        }
    ]
}

Ubuntu:20.04:LTS / grub2-signed

Package

Name
grub2-signed
Purl
pkg:deb/ubuntu/grub2-signed?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.167.2

Affected versions

1.*

1.128
1.129
1.130
1.131
1.133
1.134
1.135
1.136
1.137
1.138
1.139
1.140
1.141
1.142
1.142.1
1.142.3
1.142.4
1.142.5
1.142.6
1.142.8
1.142.9
1.142.10
1.142.11
1.167

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1.167.2+2.04-1ubuntu44.2",
            "binary_name": "grub-efi-amd64-signed"
        },
        {
            "binary_version": "1.167.2+2.04-1ubuntu44.2",
            "binary_name": "grub-efi-arm64-signed"
        }
    ]
}

Ubuntu:20.04:LTS / grub2-unsigned

Package

Name
grub2-unsigned
Purl
pkg:deb/ubuntu/grub2-unsigned?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.04-1ubuntu44.2

Affected versions

2.*

2.04-1ubuntu44

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-amd64"
        },
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-amd64-bin"
        },
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-amd64-dbg"
        },
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-arm64"
        },
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-arm64-bin"
        },
        {
            "binary_version": "2.04-1ubuntu44.2",
            "binary_name": "grub-efi-arm64-dbg"
        }
    ]
}

Ubuntu:22.04:LTS / grub2-signed

Package

Name
grub2-signed
Purl
pkg:deb/ubuntu/grub2-signed?arch=src?distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.180

Affected versions

1.*

1.173
1.174
1.176
1.177
1.178
1.179

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1.180+2.06-2ubuntu7",
            "binary_name": "grub-efi-amd64-signed"
        },
        {
            "binary_version": "1.180+2.06-2ubuntu7",
            "binary_name": "grub-efi-arm64-signed"
        }
    ]
}

Ubuntu:22.04:LTS / grub2-unsigned

Package

Name
grub2-unsigned
Purl
pkg:deb/ubuntu/grub2-unsigned?arch=src?distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.06-2ubuntu7

Affected versions

2.*

2.04-1ubuntu47
2.04-1ubuntu48
2.06-2ubuntu3
2.06-2ubuntu4
2.06-2ubuntu5
2.06-2ubuntu6

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-amd64"
        },
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-amd64-bin"
        },
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-amd64-dbg"
        },
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-arm64"
        },
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-arm64-bin"
        },
        {
            "binary_version": "2.06-2ubuntu7",
            "binary_name": "grub-efi-arm64-dbg"
        }
    ]
}