UBUNTU-CVE-2021-3156

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Source
https://ubuntu.com/security/CVE-2021-3156
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3156.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-3156
Upstream
Downstream
Related
Published
2021-01-26T18:00:00Z
Modified
2025-07-16T08:26:28.040559Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - high
Summary
[none]
Details

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

References

Affected packages

Ubuntu:Pro:14.04:LTS / sudo

Package

Name
sudo
Purl
pkg:deb/ubuntu/sudo@1.8.9p5-1ubuntu1.5+esm6?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.9p5-1ubuntu1.5+esm6

Affected versions

1.*

1.8.6p3-0ubuntu3
1.8.8-2ubuntu1
1.8.8-2ubuntu2
1.8.9p4-1ubuntu1
1.8.9p4-1ubuntu2
1.8.9p5-1ubuntu1
1.8.9p5-1ubuntu1.1
1.8.9p5-1ubuntu1.2
1.8.9p5-1ubuntu1.3
1.8.9p5-1ubuntu1.4
1.8.9p5-1ubuntu1.5+esm1
1.8.9p5-1ubuntu1.5+esm2
1.8.9p5-1ubuntu1.5+esm3
1.8.9p5-1ubuntu1.5+esm5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6",
            "binary_name": "sudo"
        },
        {
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6",
            "binary_name": "sudo-dbgsym"
        },
        {
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6",
            "binary_name": "sudo-ldap"
        },
        {
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6",
            "binary_name": "sudo-ldap-dbgsym"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:16.04:LTS / sudo

Package

Name
sudo
Purl
pkg:deb/ubuntu/sudo@1.8.16-0ubuntu1.10?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.16-0ubuntu1.10

Affected versions

1.*

1.8.12-1ubuntu3
1.8.16-0ubuntu1
1.8.16-0ubuntu1.1
1.8.16-0ubuntu1.2
1.8.16-0ubuntu1.3
1.8.16-0ubuntu1.4
1.8.16-0ubuntu1.5
1.8.16-0ubuntu1.6
1.8.16-0ubuntu1.7
1.8.16-0ubuntu1.8
1.8.16-0ubuntu1.9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.16-0ubuntu1.10",
            "binary_name": "sudo"
        },
        {
            "binary_version": "1.8.16-0ubuntu1.10",
            "binary_name": "sudo-dbgsym"
        },
        {
            "binary_version": "1.8.16-0ubuntu1.10",
            "binary_name": "sudo-ldap"
        },
        {
            "binary_version": "1.8.16-0ubuntu1.10",
            "binary_name": "sudo-ldap-dbgsym"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:18.04:LTS / sudo

Package

Name
sudo
Purl
pkg:deb/ubuntu/sudo@1.8.21p2-3ubuntu1.4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.21p2-3ubuntu1.4

Affected versions

1.*

1.8.20p2-1ubuntu1
1.8.21p2-2ubuntu1
1.8.21p2-3ubuntu1
1.8.21p2-3ubuntu1.1
1.8.21p2-3ubuntu1.2
1.8.21p2-3ubuntu1.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.21p2-3ubuntu1.4",
            "binary_name": "sudo"
        },
        {
            "binary_version": "1.8.21p2-3ubuntu1.4",
            "binary_name": "sudo-dbgsym"
        },
        {
            "binary_version": "1.8.21p2-3ubuntu1.4",
            "binary_name": "sudo-ldap"
        },
        {
            "binary_version": "1.8.21p2-3ubuntu1.4",
            "binary_name": "sudo-ldap-dbgsym"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:20.04:LTS / sudo

Package

Name
sudo
Purl
pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.31-1ubuntu1.2

Affected versions

1.*

1.8.27-1ubuntu4
1.8.29-1ubuntu1
1.8.31-1ubuntu1
1.8.31-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.8.31-1ubuntu1.2",
            "binary_name": "sudo"
        },
        {
            "binary_version": "1.8.31-1ubuntu1.2",
            "binary_name": "sudo-dbgsym"
        },
        {
            "binary_version": "1.8.31-1ubuntu1.2",
            "binary_name": "sudo-ldap"
        },
        {
            "binary_version": "1.8.31-1ubuntu1.2",
            "binary_name": "sudo-ldap-dbgsym"
        }
    ],
    "availability": "No subscription required"
}