gsd-2021-21703
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-21703",
"description": "In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.",
"id": "GSD-2021-21703",
"references": [
"https://www.suse.com/security/cve/CVE-2021-21703.html",
"https://www.debian.org/security/2021/dsa-4993",
"https://www.debian.org/security/2021/dsa-4992",
"https://ubuntu.com/security/CVE-2021-21703",
"https://advisories.mageia.org/CVE-2021-21703.html",
"https://security.archlinux.org/CVE-2021-21703",
"https://linux.oracle.com/cve/CVE-2021-21703.html",
"https://access.redhat.com/errata/RHSA-2022:1935",
"https://access.redhat.com/errata/RHSA-2022:5491"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-21703"
],
"details": "In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.",
"id": "GSD-2021-21703",
"modified": "2023-12-13T01:23:10.846309Z",
"schema_version": "1.4.0"
}
},
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"DATE_PUBLIC": "2021-10-18T22:40:00.000Z",
"ID": "CVE-2021-21703",
"STATE": "PUBLIC",
"TITLE": "PHP-FPM memory access in root process leading to privilege escalation"
},
"affects": {
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}
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"lang": "eng",
"value": "PHP FPM is being used with the main process having higher privileges than the worker processes. "
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"value": "Reported by Charles Fol"
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}
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"generator": {
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{
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{
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"source": {
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"discovery": "EXTERNAL"
}
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"impact": {
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"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 6.9,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 3.4,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
},
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"exploitabilityScore": 1.0,
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}
},
"lastModifiedDate": "2022-10-29T02:44Z",
"publishedDate": "2021-10-25T06:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.