CVE-2021-21703

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escalation", "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@php.net", "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": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "PHP", "version": {"version_data": [{"version_affected": "<=", "version_name": "7.3.x", "version_value": "7.3.31"}, {"version_affected": "<", "version_name": "7.4.x", "version_value": "7.4.25"}, {"version_affected": "<", "version_name": "8.0.X", "version_value": "8.0.12"}]}}]}, "vendor_name": "PHP Group"}]}}, "configuration": [{"lang": "en", "value": "PHP FPM is being used with the main process having higher privileges than the worker processes."}], "credit": [{"lang": "eng", "value": "Reported by Charles Fol"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": 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{"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-787 Out-of-bounds Write"}]}, {"description": [{"lang": "eng", "value": "CWE-284 Improper Access Control"}]}]}, "references": {"reference_data": [{"name": "https://bugs.php.net/bug.php?id=81026", "refsource": "MISC", "url": "https://bugs.php.net/bug.php?id=81026"}, {"name": "DSA-4992", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4992"}, {"name": "DSA-4993", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4993"}, {"name": "[oss-security] 20211026 CVE-2021-21703: PHP-FPM 5.3.7 <= 8.0.12 Local Root", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/10/26/7"}, {"name": "[debian-lts-announce] 20211027 [SECURITY] [DLA 2794-1] php7.0 security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html"}, {"name": "FEDORA-2021-9f68f5f752", "refsource": "FEDORA", "url": 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{"name": "GLSA-202209-20", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202209-20"}]}, "source": {"defect": ["https://bugs.php.net/bug.php?id=81026"], "discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:23:29.478Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugs.php.net/bug.php?id=81026"}, {"name": "DSA-4992", "tags": ["vendor-advisory", "x_refsource_DEBIAN", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4992"}, {"name": "DSA-4993", "tags": ["vendor-advisory", "x_refsource_DEBIAN", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4993"}, {"name": "[oss-security] 20211026 CVE-2021-21703: PHP-FPM 5.3.7 <= 8.0.12 Local Root", "tags": ["mailing-list", "x_refsource_MLIST", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2021/10/26/7"}, 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"80E516C0-98A4-4ADE-B69F-66A772E2BAAA", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*", "matchCriteriaId": "1FE996B1-6951-4F85-AA58-B99A379D2163", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*", "matchCriteriaId": "590ADE5F-0D0F-4576-8BA6-828758823442", "versionEndIncluding": "8.5.0.2", "versionStartIncluding": "8.0.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "En PHP versiones 7.3.x hasta 7.3.31 incluy\u00e9ndola, versiones 7.4.x y por debajo de 7.4.25 y versiones 8.0.x por debajo de 8.0. 12, cuando es ejecutado PHP FPM SAPI con el proceso demonio FPM principal ejecutado como root y los procesos worker hijos ejecutados como usuarios menos privilegiados, es posible que los procesos hijos accedan a la memoria compartida con el proceso principal y escriban en ella, modific\u00e1ndola de forma que causar\u00eda que el proceso root realizara lecturas y escrituras de memoria no v\u00e1lidas, que puede ser usado para escalar los privilegios del usuario local sin privilegios al usuario root"}], "id": "CVE-2021-21703", "lastModified": "2026-06-17T03:36:01.583", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": 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"af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202209-20"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20211118-0003/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4992"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4993"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://www.oracle.com/security-alerts/cpujan2022.html"}], "sourceIdentifier": "security@php.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}, {"lang": "en", "value": "CWE-787"}], "source": "security@php.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:1935", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "php:7.4-8060020220120080432.0a326c83", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:5491", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-php73-php-0:7.3.33-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2022-07-04T00:00:00Z"}], "bugzilla": {"description": "php: Local privilege escalation via PHP-FPM", "id": "2016535", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2016535"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-119", "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.", "php-fpm has a vulnerability which may lead to local privilege escalation. This vulnerability is hard to exploit as the attack needs to escape the FPM sandbox mechanism. When a complete attack is achieved it may lead to risk for confidentiality, data integrity, and system availability."], "name": "CVE-2021-21703", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "php", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "php", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "php:7.3/php", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "php", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-10-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21703\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21703"], "statement": "This vulnerability affects only systems with php-fpm enabled on its configuration. For an attack to be completed successfully, the attacker needs to chain this vulnerability with some other vulnerability that allows escape from the FPM sandbox first.", "threat_severity": "Moderate"}

{}