{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-4120 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-4120 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 17 Feb 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-4120 and fix it if it is affected.\n\nWhat it is: CVE-2021-4120 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 17 Feb 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-4120 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-4120/ (Markdown: https://insights.sbomify.com/CVE-2021-4120/index.md)","id":"CVE-2021-4120","markdown":"https://insights.sbomify.com/CVE-2021-4120/index.md","name":"CVE-2021-4120","record":{"aliases":["DEBIAN-CVE-2021-4120","GHSA-hfvx-54vj-h9wq","UBUNTU-CVE-2021-4120"],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux package manager","requires_auth":"low_privilege","summary":"Attackers can bypass snap confinement restrictions by injecting arbitrary AppArmor rules, enabling privilege escalation and code execution on Linux systems.","user_interaction":"required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"canonical","cpe":[{"product":"snapd","vendor":"canonical"},{"product":"ubuntu_linux","vendor":"canonical"},{"product":"fedora","vendor":"fedoraproject"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"snapd could be made to bypass intended access restrictions through snap content interfaces and layout paths","id":"CVE-2021-4120","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","fedoraproject:fedora"],"type":"security_feature_bypass","year":"2021"},"n_packages":0,"n_references":5,"next":{"headline":"Cross-site Scripting (XSS) - Stored in yetiforcecompany/yetiforcecrm","id":"CVE-2021-4121"},"packages":[],"prev":{"headline":"Improper Access Control in bookstackapp/bookstack","id":"CVE-2021-4119"},"products":["snapd"],"published":"2022-02-17","related":[{"cvss_score":10,"headline":"Command injection in snapd","id":"CVE-2023-1523","kev_date_added":null,"published":"2023-09-01"},{"cvss_score":9.3,"headline":"Privilege escalation in snapd","id":"CVE-2020-27352","kev_date_added":null,"published":"2024-06-21"},{"cvss_score":8.8,"headline":"Local privilege escalation via snapd socket","id":"CVE-2019-7304","kev_date_added":null,"published":"2019-04-23"},{"cvss_score":8.1,"headline":"CVE-2024-5138: snapd snapctl auth bypass","id":"CVE-2024-5138","kev_date_added":null,"published":"2024-05-31"},{"cvss_score":7.8,"headline":"snapd Race Condition vulnerability","id":"CVE-2022-3328","kev_date_added":null,"published":"2024-01-08"},{"cvss_score":7.8,"headline":"snapd could be made to escalate privileges and run programs as administrator","id":"CVE-2021-44730","kev_date_added":null,"published":"2022-02-17"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Canonical Ltd."]},"summary":"Attackers can bypass snap confinement restrictions by injecting arbitrary AppArmor rules, enabling privilege escalation and code execution on Linux systems.","url":"https://insights.sbomify.com/CVE-2021-4120/"}