{"answers":{"affected":"5 open source packages ship an affected version, including github.com/rancher/rancher. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-31999 in the wild and no public exploit code.","fix":"Upgrade github.com/rancher/rancher to a fixed version for your release line: 2.4.16 or 2.5.9.","what":"CVE-2021-31999 is a high-severity vulnerability in Rancher, published on 15 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-31999 and fix it if it is affected.\n\nWhat it is: CVE-2021-31999 is a high-severity vulnerability in Rancher, published on 15 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-31999 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/rancher/rancher (Go): affected from 2.0.0; fixed in 2.4.16\n- github.com/rancher/rancher (Go): affected from 2.0.0; fixed in 2.4.16\n- github.com/rancher/rancher (Go): affected from 2.0.0+incompatible; no fix listed\n- github.com/rancher/rancher (Go): affected from 2.5.0; fixed in 2.5.9\n- github.com/rancher/rancher (Go): affected from 2.5.0; fixed in 2.5.9\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-2021-31999/ (Markdown: https://insights.sbomify.com/CVE-2021-31999/index.md)","id":"CVE-2021-31999","markdown":"https://insights.sbomify.com/CVE-2021-31999/index.md","name":"CVE-2021-31999","record":{"aliases":["GHSA-pvxj-25m6-7vqr","GO-2024-2778"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"upgrade","impacts":["privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Rancher Kubernetes management","requires_auth":"low_privilege","summary":"Attackers can escalate privileges by forging impersonation headers, allowing them to act as other users within the cluster.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"suse","cpe":[{"product":"rancher","vendor":"rancher"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-807","name":"Reliance on Untrusted Inputs in a Security Decision"}],"description":"A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the \"Impersonate-User\" or \"Impersonate-Group\" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16.","ecosystems":["Go"],"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":"Rancher: Privilege escalation vulnerability via malicious Connection header","id":"CVE-2021-31999","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"privilege_escalation","year":"2021"},"n_packages":5,"n_references":1,"next":{"headline":"clone-master-clean-up: dangerous file system operations","id":"CVE-2021-32000"},"packages":[{"ecosystem":"Go","fixed":["2.4.16"],"introduced":["2.0.0"],"last_affected":[],"package":"github.com/rancher/rancher","purl":null,"source":"GHSA-pvxj-25m6-7vqr"},{"ecosystem":"Go","fixed":["2.4.16"],"introduced":["2.0.0"],"last_affected":[],"package":"github.com/rancher/rancher","purl":"pkg:golang/github.com/rancher/rancher","source":"GHSA-pvxj-25m6-7vqr"},{"ecosystem":"Go","fixed":[],"introduced":["2.0.0+incompatible"],"last_affected":[],"package":"github.com/rancher/rancher","purl":"pkg:golang/github.com/rancher/rancher","source":"GO-2024-2778"},{"ecosystem":"Go","fixed":["2.5.9"],"introduced":["2.5.0"],"last_affected":[],"package":"github.com/rancher/rancher","purl":null,"source":"GHSA-pvxj-25m6-7vqr"},{"ecosystem":"Go","fixed":["2.5.9"],"introduced":["2.5.0"],"last_affected":[],"package":"github.com/rancher/rancher","purl":"pkg:golang/github.com/rancher/rancher","source":"GHSA-pvxj-25m6-7vqr"}],"prev":{"headline":"inn: %post calls user owned file allowing local privilege escalation to root","id":"CVE-2021-31998"},"products":["Rancher","SUSE Linux Enterprise Server 15"],"published":"2021-07-15","related":[{"cvss_score":9.9,"headline":"Rancher: Cloud credentials can be used through proxy API by users without access","id":"CVE-2021-25320","kev_date_added":null,"published":"2021-07-15"},{"cvss_score":8.8,"headline":"Deleting PRTBs associated to a group doesn't cause deletion of corresponding RoleBindings","id":"CVE-2021-36775","kev_date_added":null,"published":"2022-04-01"},{"cvss_score":8.8,"headline":"Steve API proxy impersonation","id":"CVE-2021-36776","kev_date_added":null,"published":"2022-04-01"},{"cvss_score":8.8,"headline":"rancher: API group not properly specified when creating Kubernetes RBAC resources","id":"CVE-2021-25318","kev_date_added":null,"published":"2021-07-15"}],"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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-17","vendors":["Rancher"]},"summary":"Attackers can escalate privileges by forging impersonation headers, allowing them to act as other users within the cluster.","url":"https://insights.sbomify.com/CVE-2021-31999/"}