{"answers":{"affected":"4 open source packages ship an affected version, including io.ktor:ktor-client-cio and io.ktor:ktor-server-cio. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-5207 in the wild and no public exploit code.","fix":"Upgrade io.ktor:ktor-client-cio to 1.3.0 or later.","what":"CVE-2020-5207 is a medium-severity vulnerability in Ktor.io Ktor, published on 27 Jan 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2020-5207 and fix it if it is affected.\n\nWhat it is: CVE-2020-5207 is a medium-severity vulnerability in Ktor.io Ktor, published on 27 Jan 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2020-5207 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.ktor:ktor-client-cio (Maven): affected all versions; fixed in 1.3.0\n- io.ktor:ktor-client-cio (Maven): affected all versions; fixed in 1.3.0\n- io.ktor:ktor-server-cio (Maven): affected all versions; fixed in 1.3.0\n- io.ktor:ktor-server-cio (Maven): affected all versions; fixed in 1.3.0\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-2020-5207/ (Markdown: https://insights.sbomify.com/CVE-2020-5207/index.md)","id":"CVE-2020-5207","markdown":"https://insights.sbomify.com/CVE-2020-5207/index.md","name":"CVE-2020-5207","record":{"aliases":["GHSA-xrr9-rh8p-433v"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Ktor HTTP library","requires_auth":"low_privilege","summary":"Request smuggling allows bypassing proxy security controls in Ktor when specific header conditions are met.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"ktor","vendor":"jetbrains"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn't handle Content-Length and Transfer-Encoding properly or doesn't handle \\n as a headers separator.","ecosystems":["Maven"],"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":"Request smuggling is possible in Ktor when both chunked TE and content length specified","id":"CVE-2020-5207","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"other","year":"2020"},"n_packages":4,"n_references":2,"next":{"headline":"remote code execution vulnerability in ipmitool","id":"CVE-2020-5208"},"packages":[{"ecosystem":"Maven","fixed":["1.3.0"],"introduced":["0"],"last_affected":[],"package":"io.ktor:ktor-client-cio","purl":null,"source":"GHSA-xrr9-rh8p-433v"},{"ecosystem":"Maven","fixed":["1.3.0"],"introduced":["0"],"last_affected":[],"package":"io.ktor:ktor-client-cio","purl":"pkg:maven/io.ktor/ktor-client-cio","source":"GHSA-xrr9-rh8p-433v"},{"ecosystem":"Maven","fixed":["1.3.0"],"introduced":["0"],"last_affected":[],"package":"io.ktor:ktor-server-cio","purl":null,"source":"GHSA-xrr9-rh8p-433v"},{"ecosystem":"Maven","fixed":["1.3.0"],"introduced":["0"],"last_affected":[],"package":"io.ktor:ktor-server-cio","purl":"pkg:maven/io.ktor/ktor-server-cio","source":"GHSA-xrr9-rh8p-433v"}],"prev":{"headline":"Authentication Bypass For Endpoints With Anonymous Access in OpenCast","id":"CVE-2020-5206"},"products":["Ktor"],"published":"2020-01-27","related":[{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2019-12736","kev_date_added":null,"published":"2019-10-02"},{"cvss_score":8.7,"headline":"SHA1 implementation in JetBrains Ktor Native 2.0.0 was returning the same value.","id":"CVE-2022-29930","kev_date_added":null,"published":"2022-05-12"},{"cvss_score":8.6,"headline":"XML external entity in Ktor","id":"CVE-2023-45612","kev_date_added":null,"published":"2023-10-09"},{"cvss_score":7.5,"headline":"Path traversal in Ktor","id":"CVE-2022-48476","kev_date_added":null,"published":"2023-04-24"},{"cvss_score":7.5,"headline":"Auth bypass in n/a","id":"CVE-2021-43203","kev_date_added":null,"published":"2021-11-09"},{"cvss_score":6.8,"headline":"Security feature bypass in Ktor","id":"CVE-2023-45613","kev_date_added":null,"published":"2023-10-09"},{"cvss_score":6.5,"headline":"Other in n/a","id":"CVE-2020-26129","kev_date_added":null,"published":"2020-11-16"}],"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":"2024-08-04","vendors":["Ktor.io"]},"summary":"Request smuggling allows bypassing proxy security controls in Ktor when specific header conditions are met.","url":"https://insights.sbomify.com/CVE-2020-5207/"}