{"id":"CVE-2024-45397","state":"PUBLISHED","title":"H2O alllows bypassing address-based access control with 0-RTT","description":"h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.","publishedAt":"2024-10-11T14:24:57.687Z","updatedAt":"2024-10-11T14:42:24.963Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["h2o h2o"],"affected":[{"vendor":"h2o","product":"h2o","versions":[{"version":"< 15ed15a2efb83a77bb4baaa5a119e639c2f6898a","status":"affected"}]}],"references":["https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c","https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a","https://h2o.examp1e.net/configure/http3_directives.html"],"weaknesses":["CWE-284"],"ingestedAt":"2026-10-29T20:07:47.831Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/45xxx/CVE-2024-45397.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-45397","state":"PUBLISHED","datePublished":"2024-10-11T14:24:57.687Z","dateUpdated":"2024-10-11T14:42:24.963Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2024-08-28T20:21:32.802Z"},"containers":{"cna":{"title":"H2O alllows bypassing address-based access control with 0-RTT","descriptions":[{"lang":"en","value":"h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue."}],"affected":[{"vendor":"h2o","product":"h2o","versions":[{"version":"< 15ed15a2efb83a77bb4baaa5a119e639c2f6898a","status":"affected"}]}],"references":[{"url":"https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c","name":"https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a","name":"https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a","tags":["x_refsource_MISC"]},{"url":"https://h2o.examp1e.net/configure/http3_directives.html","name":"https://h2o.examp1e.net/configure/http3_directives.html","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","lang":"en","description":"CWE-284: Improper Access Control","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2024-10-11T14:24:57.687Z"},"source":{"advisory":"GHSA-jf2c-xjcp-wg4c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-10-11T14:42:12.389414Z","id":"CVE-2024-45397","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-11T14:42:24.963Z"}}]}}}