{"answers":{"affected":"6 open source packages ship an affected version, including github.com/docker/docker and github.com/moby/moby. It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-41091 in the wild and no public exploit code.","fix":"Upgrade github.com/docker/docker to a fixed version for your release line: 20.10.9 or 20.10.9+incompatible.","what":"CVE-2021-41091 is a medium-severity missing authorization vulnerability in Fedoraproject Fedora, published on 4 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-41091 and fix it if it is affected.\n\nWhat it is: CVE-2021-41091 is a medium-severity missing authorization vulnerability in Fedoraproject Fedora, published on 4 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-41091 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/docker/docker (Go): affected all versions; fixed in 20.10.9\n- github.com/docker/docker (Go): affected all versions; fixed in 20.10.9\n- github.com/docker/docker (Go): affected all versions; fixed in 20.10.9+incompatible\n- github.com/moby/moby (Go): affected all versions; fixed in 20.10.9\n- github.com/moby/moby (Go): affected all versions; fixed in 20.10.9\n- github.com/moby/moby (Go): affected all versions; fixed in 20.10.9+incompatible\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-2021-41091/ (Markdown: https://insights.sbomify.com/CVE-2021-41091/index.md)","id":"CVE-2021-41091","markdown":"https://insights.sbomify.com/CVE-2021-41091/index.md","name":"CVE-2021-41091","record":{"aliases":["CLEANSTART-2026-OT60529","DEBIAN-CVE-2021-41091","GHSA-3fwx-pjgw-3558","GO-2024-2500","UBUNTU-CVE-2021-41091"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Docker Engine","requires_auth":"low_privilege","summary":"Unprivileged Linux users can read, modify, or execute files in Docker data directories due to insufficient permissions, potentially compromising container isolation.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"moby","vendor":"mobyproject"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-732","name":"Incorrect Permission Assignment for Critical Resource"},{"id":"CWE-281","name":"Improper Preservation of Permissions"}],"description":"Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where the data directory (typically `/var/lib/docker`) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as `setuid`), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers should be stopped and restarted for the permissions to be fixed. For users unable to upgrade limit access to the host to trusted users. Limit access to host volumes to trusted containers.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":"2023-05-02","github_poc":3,"max_poc_stars":66,"metasploit":0,"nuclei":0,"refs":[{"date":"2023-05-02T07:25:13Z","kind":"github_poc","ref":"https://github.com/UncleJ4ck/CVE-2021-41091","stars":66,"title":"POC for CVE-2021-41091"},{"date":"2024-06-30T10:57:02Z","kind":"github_poc","ref":"https://github.com/SNE-M23-SN/Vulnerable-Docker-Engine","stars":2,"title":"This exploit offers an in-depth look at the CVE-2021-41091 security vulnerability and provides a step-by-step guide on how to utilize the exploit script to achieve privilege escalation on a host."},{"date":"2024-05-10T04:42:35Z","kind":"github_poc","ref":"https://github.com/jrbH4CK/CVE-2021-41091","stars":0,"title":null}],"tier":"poc_unverified"},"has_fix":true,"headline":"Insufficiently restricted permissions on data directory in Docker Engine","id":"CVE-2021-41091","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"fedoraproject:fedora","products":["fedoraproject:fedora"],"type":"missing_authorization","year":"2021"},"n_packages":6,"n_references":5,"next":{"headline":"Docker CLI leaks private registry credentials to registry-1.docker.io","id":"CVE-2021-41092"},"packages":[{"ecosystem":"Go","fixed":["20.10.9"],"introduced":["0"],"last_affected":[],"package":"github.com/docker/docker","purl":null,"source":"GHSA-3fwx-pjgw-3558"},{"ecosystem":"Go","fixed":["20.10.9"],"introduced":["0"],"last_affected":[],"package":"github.com/docker/docker","purl":"pkg:golang/github.com/docker/docker","source":"GHSA-3fwx-pjgw-3558"},{"ecosystem":"Go","fixed":["20.10.9+incompatible"],"introduced":["0"],"last_affected":[],"package":"github.com/docker/docker","purl":"pkg:golang/github.com/docker/docker","source":"GO-2024-2500"},{"ecosystem":"Go","fixed":["20.10.9"],"introduced":["0"],"last_affected":[],"package":"github.com/moby/moby","purl":null,"source":"GHSA-3fwx-pjgw-3558"},{"ecosystem":"Go","fixed":["20.10.9"],"introduced":["0"],"last_affected":[],"package":"github.com/moby/moby","purl":"pkg:golang/github.com/moby/moby","source":"GHSA-3fwx-pjgw-3558"},{"ecosystem":"Go","fixed":["20.10.9+incompatible"],"introduced":["0"],"last_affected":[],"package":"github.com/moby/moby","purl":"pkg:golang/github.com/moby/moby","source":"GO-2024-2500"}],"prev":{"headline":"Instance config inline secret exposure","id":"CVE-2021-41090"},"products":["moby"],"published":"2021-10-04","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["moby"]},"summary":"Unprivileged Linux users can read, modify, or execute files in Docker data directories due to insufficient permissions, potentially compromising container isolation.","url":"https://insights.sbomify.com/CVE-2021-41091/"}