CVE-2024-5300

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The abstraction rules located in /etc/apparmor.d/abstractions/nss-systemd (inherited via ) inadvertently permit strictly confined snap applications, which lack the privileged account-control interface, to interact directly with the io.systemd.Multiplexer and io.systemd.NameServiceSwitch UNIX domain sockets under /run/systemd/userdb/.\nOn systems where the systemd-userdbd service is installed and operational, the service fails to distinguish between an unconfined root user on the host system and a restricted root user running within a snap application's sandbox (such as a daemon or configuration hook). Because systemd-userdbd returns \"complete\" user records\u2014including sensitive hashed user passwords from /etc/shadow\u2014when queried by a process running as root, a compromised or malicious strictly confined snap executing code as root can successfully query the Varlink interface to retrieve all system password hashes, bypassing intended snap sandbox restrictions. This issue is mitigated by the fact that systemd-userdbd is not installed by default on standard Ubuntu deployments."}], "references": [{"url": "https://ubuntu.com/security/CVE-2024-5300", "tags": ["vdb-entry", "issue-tracking"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 5.6, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"}}], "credits": [{"lang": "en", "value": "James Henstridge", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-07-21T14:00:51.066Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-22T18:13:29.966474Z", "id": "CVE-2024-5300", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-22T18:28:16.818Z"}}]}}

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The abstraction rules located in /etc/apparmor.d/abstractions/nss-systemd (inherited via ) inadvertently permit strictly confined snap applications, which lack the privileged account-control interface, to interact directly with the io.systemd.Multiplexer and io.systemd.NameServiceSwitch UNIX domain sockets under /run/systemd/userdb/.\nOn systems where the systemd-userdbd service is installed and operational, the service fails to distinguish between an unconfined root user on the host system and a restricted root user running within a snap application's sandbox (such as a daemon or configuration hook). Because systemd-userdbd returns \"complete\" user records\u2014including sensitive hashed user passwords from /etc/shadow\u2014when queried by a process running as root, a compromised or malicious strictly confined snap executing code as root can successfully query the Varlink interface to retrieve all system password hashes, bypassing intended snap sandbox restrictions. This issue is mitigated by the fact that systemd-userdbd is not installed by default on standard Ubuntu deployments."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-212", "description": "CWE-212 Improper removal of sensitive information before storage or transfer"}]}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-07-21T14:00:51.066Z"}}}, "cveMetadata": {"cveId": "CVE-2024-5300", "state": "PUBLISHED", "dateUpdated": "2026-07-22T18:28:16.818Z", "dateReserved": "2024-05-23T21:58:22.809Z", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "datePublished": "2026-07-21T14:00:51.066Z", "assignerShortName": "canonical"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "snapd: systemd: Canonical snapd: Information disclosure of system password hashes via AppArmor bypass", "id": "2503660", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503660"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-1220", "details": ["A flaw was found in Canonical snapd. The base AppArmor security profile configuration in snapd inadvertently allows strictly confined snap applications to bypass intended sandbox restrictions. This enables a compromised or malicious snap application, when running as root, to access sensitive system password hashes from the systemd-userdbd service, leading to information disclosure. This issue is mitigated on systems where the systemd-userdbd service is not installed by default."], "name": "CVE-2024-5300", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-21T14:00:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-5300\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-5300\nhttps://ubuntu.com/security/CVE-2024-5300"], "statement": "Red Hat does not ship the Canonical snapd package. The vulnerability is in snapd's AppArmor security profile configuration, not in systemd itself. RHEL systems are not affected as they do not include snapd.", "threat_severity": "Moderate"}

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