Medium
squid, squid3 — security advisory
An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.
- Products
- squid, squid3
- Affected versions
- 3.3.8-1ubuntu16, 3.3.8-1ubuntu17, 3.5.12-1ubuntu6, 3.5.12-1ubuntu7, 3.5.12-1ubuntu7.1, 3.5.12-1ubuntu7.10, 3.5.12-1ubuntu7.11, 3.5.12-1ubuntu7.12, 3.5.12-1ubuntu7.13, 3.5.12-1ubuntu7.14, 3.5.12-1ubuntu7.15, 3.5.12-1ubuntu7.16, 3.5.12-1ubuntu7.16+esm1, 3.5.12-1ubuntu7.16+esm2, 3.5.12-1ubuntu7.16+esm3, 3.5.12-1ubuntu7.16+esm4, 3.5.12-1ubuntu7.16+esm5, 3.5.12-1ubuntu7.16+esm6, 3.5.12-1ubuntu7.16+esm7, 3.5.12-1ubuntu7.2, 3.5.12-1ubuntu7.3, 3.5.12-1ubuntu7.4, 3.5.12-1ubuntu7.5, 3.5.12-1ubuntu7.6, 3.5.12-1ubuntu7.7, 3.5.12-1ubuntu7.8, 3.5.12-1ubuntu7.9, 3.5.23-5ubuntu1, 3.5.23-5ubuntu2, 3.5.27-1ubuntu1, 3.5.27-1ubuntu1.1, 3.5.27-1ubuntu1.10, 3.5.27-1ubuntu1.11, 3.5.27-1ubuntu1.12, 3.5.27-1ubuntu1.13, 3.5.27-1ubuntu1.14, 3.5.27-1ubuntu1.14+esm1, 3.5.27-1ubuntu1.14+esm2, 3.5.27-1ubuntu1.14+esm3, 3.5.27-1ubuntu1.14+esm4, 3.5.27-1ubuntu1.14+esm5, 3.5.27-1ubuntu1.14+esm6, 3.5.27-1ubuntu1.2, 3.5.27-1ubuntu1.3, 3.5.27-1ubuntu1.4, 3.5.27-1ubuntu1.5, 3.5.27-1ubuntu1.6, 3.5.27-1ubuntu1.7, 3.5.27-1ubuntu1.8, 3.5.27-1ubuntu1.9, 4.10-1ubuntu1, 4.10-1ubuntu1.1, 4.10-1ubuntu1.10, 4.10-1ubuntu1.11, 4.10-1ubuntu1.12, 4.10-1ubuntu1.13, 4.10-1ubuntu1.13+esm1, 4.10-1ubuntu1.13+esm2, 4.10-1ubuntu1.13+esm3, 4.10-1ubuntu1.2, 4.10-1ubuntu1.3, 4.10-1ubuntu1.4, 4.10-1ubuntu1.5, 4.10-1ubuntu1.6, 4.10-1ubuntu1.7, 4.10-1ubuntu1.8, 4.10-1ubuntu1.9, 4.13-10ubuntu5, 4.8-1ubuntu2, 4.8-1ubuntu3, 4.9-2ubuntu1, 4.9-2ubuntu2, 4.9-2ubuntu3, 4.9-2ubuntu4, 5.2-1ubuntu1, 5.2-1ubuntu3, 5.2-1ubuntu4, 5.2-1ubuntu4.1, 5.2-1ubuntu4.2, 5.2-1ubuntu4.3, 5.7-0ubuntu0.22.04.1, 5.7-0ubuntu0.22.04.2, 5.7-0ubuntu0.22.04.3, 5.7-0ubuntu0.22.04.4, 5.9-0ubuntu0.22.04.1, 5.9-0ubuntu0.22.04.2, 5.9-0ubuntu0.22.04.3, 5.9-0ubuntu0.22.04.4, 5.9-0ubuntu0.22.04.5, 5.9-0ubuntu0.22.04.7, 5.9-0ubuntu0.22.04.8, 6.1-2ubuntu1, 6.1-2ubuntu2, 6.10-0ubuntu0.24.04.1, 6.13-0ubuntu0.24.04.1, 6.13-0ubuntu0.24.04.2, 6.13-0ubuntu0.24.04.3, 6.13-1ubuntu1, 6.13-1ubuntu2, 6.13-1ubuntu3, 6.13-1ubuntu4, 6.13-1ubuntu4.1, 6.13-1ubuntu5, 6.14-0ubuntu0.24.04.1, 6.14-0ubuntu0.24.04.2, 6.14-0ubuntu0.24.04.4, 6.14-0ubuntu0.24.04.5, 6.14-0ubuntu0.25.10.1, 6.14-0ubuntu0.25.10.2, 6.14-0ubuntu0.25.10.4, 6.5-1ubuntu1, 6.5-1ubuntu2, 6.5-1ubuntu3, 6.6-1ubuntu4, 6.6-1ubuntu5, 6.6-1ubuntu5.1, 7.2-2ubuntu1, 7.2-2ubuntu2, 7.2-2ubuntu2.2, 7.6-2ubuntu1, 7.6-2ubuntu3, 7.7-0ubuntu0.26.04.1, 7.7-1ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2019-12522
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 17:58 UTC · Revision 1
Source evidence
An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.
osv:UBUNTU-CVE-2019-12522
squid3
Fixed versions: Not specified
squid3
Fixed versions: Not specified
squid
Fixed versions: Not specified
squid
Fixed versions: Not specified
squid
Fixed versions: Not specified
squid
Fixed versions: Not specified
squid
Fixed versions: Not specified
squid
Fixed versions: Not specified
Complete source record
{
"id": "d837ccff5801655d74a3a52595809e5045062eb8c2e8a3d7bd2f8d3aa00ba865",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2019-12522",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2019-12522",
"summary": "An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.",
"evidence": "osv:UBUNTU-CVE-2019-12522",
"products": [
{
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},
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{
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},
{
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{
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{
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{
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},
{
"name": {
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},
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
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{
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{
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{
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{
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{
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{
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{
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{
"value": "5.7-0ubuntu0.22.04.1",
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{
"value": "5.7-0ubuntu0.22.04.2",
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{
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{
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},
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{
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{
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{
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},
{
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},
{
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]
},
{
"name": {
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},
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{
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},
{
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},
{
"value": "7.6-2ubuntu3",
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},
{
"value": "7.7-1ubuntu1",
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}
]
},
{
"name": {
"value": "squid",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.13-1ubuntu4",
"evidence": "/affected/7/versions"
},
{
"value": "6.13-1ubuntu5",
"evidence": "/affected/7/versions"
},
{
"value": "7.2-2ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "7.2-2ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "7.2-2ubuntu2.2",
"evidence": "/affected/7/versions"
},
{
"value": "7.7-0ubuntu0.26.04.1",
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}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2019-12522",
"aliases": [
"UBUNTU-CVE-2019-12522"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"
},
{
"type": "Ubuntu",
"score": "low"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"3.3.8-1ubuntu17",
"3.5.12-1ubuntu6",
"3.5.12-1ubuntu7",
"3.5.12-1ubuntu7.1",
"3.5.12-1ubuntu7.2",
"3.5.12-1ubuntu7.3",
"3.5.12-1ubuntu7.4",
"3.5.12-1ubuntu7.5",
"3.5.12-1ubuntu7.6",
"3.5.12-1ubuntu7.7",
"3.5.12-1ubuntu7.8",
"3.5.12-1ubuntu7.9",
"3.5.12-1ubuntu7.10",
"3.5.12-1ubuntu7.11",
"3.5.12-1ubuntu7.12",
"3.5.12-1ubuntu7.13",
"3.5.12-1ubuntu7.14",
"3.5.12-1ubuntu7.15",
"3.5.12-1ubuntu7.16",
"3.5.12-1ubuntu7.16+esm1",
"3.5.12-1ubuntu7.16+esm2",
"3.5.12-1ubuntu7.16+esm3",
"3.5.12-1ubuntu7.16+esm4",
"3.5.12-1ubuntu7.16+esm5",
"3.5.12-1ubuntu7.16+esm6",
"3.5.12-1ubuntu7.16+esm7"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squid3",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
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],
"modified": "2026-10-22T10:30:04.310327664Z",
"provider": "osv",
"upstream": [
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],
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"https://ubuntu.com/security/CVE-2019-12522",
"https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12522.txt",
"https://www.cve.org/CVERecord?id=CVE-2019-12522"
]
},
"related_cves": [
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"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 405362,
"published_at": "2020-04-15T19:15:00+00:00"
}