cve-2021-43848
Vulnerability from cvelistv5
Published
2022-02-01 12:13
Modified
2024-08-04 04:10
Severity ?
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
References
security-advisories@github.comhttps://github.com/h2o/h2o/commit/8c0eca3Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/h2o/h2o/commit/8c0eca3Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

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