{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/vex/2021/cve-2021-3560-els_os-ubuntu16_04els.json" } ], "tracking": { "current_release_date": "2026-06-13T13:56:07Z", "generator": { "date": "2026-06-13T13:56:07Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-3560-ELS_OS-UBUNTU16.04ELS", "initial_release_date": "2021-01-01T00:00:00Z", "revision_history": [ { "date": "2021-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-11-29T18:09:49Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" }, { "date": "2026-06-13T13:56:07Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2021-3560" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 16.04", "product": { "name": "Ubuntu 16.04", "product_id": "Ubuntu-16", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/libpolkit-backend-1-dev@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "TuxCare" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libpolkit-agent-1-dev@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libpolkit-backend-1-0@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libpolkit-gobject-1-0@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/policykit-1@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libpolkit-gobject-1-dev@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/libpolkit-agent-1-0@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product": { "name": "gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_id": "gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/gir1.2-polkit-1.0@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" }, { "branches": [ { "category": "product_version", "name": "policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all", "product": { "name": "policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all", "product_id": "policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/policykit-1-doc@0.105-14.1ubuntu0.5%2Btuxcare.els1?arch=all" } } } ], "category": "architecture", "name": "all" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all" }, "product_reference": "policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64" }, "product_reference": "gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-3560", "cwe": { "id": "CWE-863", "name": "Incorrect Authorization" }, "notes": [ { "category": "description", "text": "It was found that polkit could be tricked into bypassing the credential checks for D-Bus requests, elevating the privileges of the requestor to the root user. This flaw could be used by an unprivileged local attacker to, for example, create a new local administrator. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Ubuntu-16:gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-3560" }, { "category": "external", "summary": "http://packetstormsecurity.com/files/172836/polkit-Authentication-Bypass.html", "url": "http://packetstormsecurity.com/files/172836/polkit-Authentication-Bypass.html" }, { "category": "external", "summary": "http://packetstormsecurity.com/files/172846/Facebook-Fizz-Denial-Of-Service.html", "url": "http://packetstormsecurity.com/files/172846/Facebook-Fizz-Denial-Of-Service.html" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=1961710", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1961710" }, { "category": "external", "summary": "https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/", "url": "https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/" }, { "category": "external", "summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3560", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3560" } ], "release_date": "2022-02-16T19:15:00Z", "scores": [ { "cvss_v2": { "accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0" }, "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Ubuntu-16:gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all" ] } ], "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "date": "2026-06-12T13:00:32.772099Z", "details": "Not affected: CVE-2021-3560 exploits a flaw introduced in polkit 0.113 that causes polkit_system_bus_name_get_creds_sync to succeed incorrectly on certain D‑Bus disconnects, but the policykit-1 package in scope is 0.105 and does not include that code (no backport present). Because the vulnerable logic is absent, the D‑Bus credential‑bypass path is not reachable and local privilege escalation via this CVE is not possible.", "product_ids": [ "Ubuntu-16:gir1.2-polkit-1.0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-agent-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-backend-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-0-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:libpolkit-gobject-1-dev-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-0:0.105-14.1ubuntu0.5+tuxcare.els1.amd64", "Ubuntu-16:policykit-1-doc-0:0.105-14.1ubuntu0.5+tuxcare.els1.all" ] } ] } ] }