HighFix available
sudo — security advisory
selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.
- Products
- sudo
- Affected versions
- Not specified
- Fixed versions
- 1.9.5-r0, 1.9.5p2-r0
- CVEs
- CVE-2021-23240
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:02 UTC · Revision 1
Source evidence
selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.
osv:ALPINE-CVE-2021-23240
sudo
Fixed versions: 1.9.5p2-r0
sudo
Fixed versions: 1.9.5p2-r0
sudo
Fixed versions: 1.9.5-r0
sudo
Fixed versions: 1.9.5-r0
sudo
Fixed versions: 1.9.5-r0
sudo
Fixed versions: 1.9.5-r0
Complete source record
{
"id": "8b92c4a47f37fb74814b78011b52a7af9e877c62b0f6f785eb2829c988686ca6",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-23240",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-23240",
"summary": "selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.",
"evidence": "osv:ALPINE-CVE-2021-23240",
"products": [
{
"name": {
"value": "sudo",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.5p2-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "sudo",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.5p2-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.5-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.5-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"fixed_versions": [
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2021-23240",
"aliases": [
"ALPINE-CVE-2021-23240"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.9.0"
},
{
"fixed": "1.9.5p2-r0"
}
]
}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.10"
},
"database_specific": {
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},
"ecosystem_specific": {}
},
{
"ranges": [
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"events": [
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{
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}
]
}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.11"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-23240.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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{
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]
}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.12"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-23240.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
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{
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}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-23240.json"
},
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{
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}
]
}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-23240.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.9.0"
},
{
"fixed": "1.9.5-r0"
}
]
}
],
"package": {
"name": "sudo",
"purl": "pkg:apk/alpine/sudo?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-23240.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-23T17:17:56.156848682Z",
"provider": "osv",
"upstream": [
"CVE-2021-23240"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-23240"
]
},
"related_cves": [
{
"value": "CVE-2021-23240",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415325,
"published_at": "2021-01-12T09:15:14.107+00:00"
}