UBUNTU-CVE-2021-42375

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Source
https://ubuntu.com/security/CVE-2021-42375
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-42375.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-42375
Upstream
Withdrawn
2025-07-18T16:47:01Z
Published
2021-11-15T21:15:00Z
Modified
2025-07-16T07:20:00.108745Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - negligible
Summary
[none]
Details

An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.

References

Affected packages

Ubuntu:18.04:LTS / busybox

Package

Name
busybox
Purl
pkg:deb/ubuntu/busybox@1:1.27.2-2ubuntu3.3?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:1.27.2-2ubuntu3.3

Affected versions

1:1.*
1:1.22.0-19ubuntu2
1:1.27.2-1ubuntu3
1:1.27.2-1ubuntu4
1:1.27.2-2ubuntu2
1:1.27.2-2ubuntu3
1:1.27.2-2ubuntu3.1
1:1.27.2-2ubuntu3.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "busybox",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-dbgsym",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-initramfs",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-initramfs-dbgsym",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-static",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-static-dbgsym",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-syslogd",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "busybox-udeb",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "udhcpc",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        },
        {
            "binary_name": "udhcpd",
            "binary_version": "1:1.27.2-2ubuntu3.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-42375.json"

Ubuntu:20.04:LTS / busybox

Package

Name
busybox
Purl
pkg:deb/ubuntu/busybox@1:1.30.1-4ubuntu6.3?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:1.30.1-4ubuntu6.3

Affected versions

1:1.*
1:1.30.1-4ubuntu4
1:1.30.1-4ubuntu5
1:1.30.1-4ubuntu6
1:1.30.1-4ubuntu6.1
1:1.30.1-4ubuntu6.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "busybox",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-dbgsym",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-initramfs",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-initramfs-dbgsym",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-static",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-static-dbgsym",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-syslogd",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "busybox-udeb",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "udhcpc",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        },
        {
            "binary_name": "udhcpd",
            "binary_version": "1:1.30.1-4ubuntu6.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-42375.json"

Ubuntu:22.04:LTS / busybox

Package

Name
busybox
Purl
pkg:deb/ubuntu/busybox@1:1.30.1-6ubuntu3?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:1.30.1-6ubuntu3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "busybox",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-dbgsym",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-initramfs",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-initramfs-dbgsym",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-static",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-static-dbgsym",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "busybox-syslogd",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "udhcpc",
            "binary_version": "1:1.30.1-6ubuntu3"
        },
        {
            "binary_name": "udhcpd",
            "binary_version": "1:1.30.1-6ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-42375.json"