{"answers":{"affected":"3 open source packages ship an affected version, including github.com/google/exposure-notifications-verification-server. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-22538 in the wild and no public exploit code.","fix":"Upgrade github.com/google/exposure-notifications-verification-server to 0.23.1 or later.","what":"CVE-2021-22538 is a medium-severity vulnerability in Google LLC Exposure Notifications Verification Server, published on 31 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-22538 and fix it if it is affected.\n\nWhat it is: CVE-2021-22538 is a medium-severity vulnerability in Google LLC Exposure Notifications Verification Server, published on 31 Mar 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-2021-22538 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/google/exposure-notifications-verification-server (Go): affected all versions; fixed in 0.23.1\n- github.com/google/exposure-notifications-verification-server (Go): affected all versions; fixed in 0.23.1\n- github.com/google/exposure-notifications-verification-server (Go): affected all versions; fixed in 0.23.1\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-2021-22538/ (Markdown: https://insights.sbomify.com/CVE-2021-22538/index.md)","id":"CVE-2021-22538","markdown":"https://insights.sbomify.com/CVE-2021-22538/index.md","name":"CVE-2021-22538","record":{"aliases":["GHSA-5v95-v8c8-3rh6","GO-2022-0798"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Exposure Notification Server","requires_auth":"low_privilege","summary":"An attacker with UserWrite permissions can escalate privileges by creating a higher-privileged user due to insufficient permission checks.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Google","cpe":[{"product":"exposure_notifications_verification_server","vendor":"google"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-276","name":"Incorrect Default Permissions"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.","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":"Privilege escalation in RBAC system","id":"CVE-2021-22538","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"privilege_escalation","year":"2021"},"n_packages":3,"n_references":4,"next":{"headline":"Code execution in VSCode-bazel via malicious Bazel config files","id":"CVE-2021-22539"},"packages":[{"ecosystem":"Go","fixed":["0.23.1"],"introduced":["0"],"last_affected":[],"package":"github.com/google/exposure-notifications-verification-server","purl":null,"source":"GHSA-5v95-v8c8-3rh6"},{"ecosystem":"Go","fixed":["0.23.1"],"introduced":["0"],"last_affected":[],"package":"github.com/google/exposure-notifications-verification-server","purl":"pkg:golang/github.com/google/exposure-notifications-verification-server","source":"GHSA-5v95-v8c8-3rh6"},{"ecosystem":"Go","fixed":["0.23.1"],"introduced":["0"],"last_affected":[],"package":"github.com/google/exposure-notifications-verification-server","purl":"pkg:golang/github.com/google/exposure-notifications-verification-server","source":"GO-2022-0798"}],"prev":{"headline":"Information disclosure in Directory and Resource Administrator (DRA)","id":"CVE-2021-22535"},"products":["Exposure Notifications Verification Server"],"published":"2021-03-31","related":[],"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":"2024-08-03","vendors":["Google LLC"]},"summary":"An attacker with UserWrite permissions can escalate privileges by creating a higher-privileged user due to insufficient permission checks.","url":"https://insights.sbomify.com/CVE-2021-22538/"}