{"answers":{"affected":"2 open source packages ship an affected version, including realms-shim. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23543 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-23543 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-23543 is a critical code injection vulnerability in realms-shim, published on 7 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-23543 and fix it if it is affected.\n\nWhat it is: CVE-2021-23543 is a critical code injection vulnerability in realms-shim, published on 7 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-23543 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- realms-shim (npm): affected all versions up to 1.2.2; no fix listed\n- realms-shim (npm): affected all versions up to 1.2.2; no fix listed\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-2021-23543/ (Markdown: https://insights.sbomify.com/CVE-2021-23543/index.md)","id":"CVE-2021-23543","markdown":"https://insights.sbomify.com/CVE-2021-23543/index.md","name":"CVE-2021-23543","record":{"aliases":["GHSA-q4j7-v27r-fgcx"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript shim library","requires_auth":"none","summary":"Attackers can bypass sandbox restrictions and execute arbitrary code via prototype pollution in the realms-shim library.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"realms-shim","vendor":"agoric"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P","version":"3.1"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Sandbox Bypass","id":"CVE-2021-23543","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"code_injection","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Sandbox Bypass","id":"CVE-2021-23555"},"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["1.2.2"],"package":"realms-shim","purl":null,"source":"GHSA-q4j7-v27r-fgcx"},{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["1.2.2"],"package":"realms-shim","purl":"pkg:npm/realms-shim","source":"GHSA-q4j7-v27r-fgcx"}],"prev":{"headline":"Link Following","id":"CVE-2021-23521"},"products":["realms-shim"],"published":"2022-01-07","related":[{"cvss_score":9.8,"headline":"Sandbox Bypass","id":"CVE-2021-23594","kev_date_added":null,"published":"2022-01-07"}],"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":"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":"2024-09-16","vendors":["n/a"]},"summary":"Attackers can bypass sandbox restrictions and execute arbitrary code via prototype pollution in the realms-shim library.","url":"https://insights.sbomify.com/CVE-2021-23543/"}