Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dena | H2O | < 2021-12-20 |
Related Weaknesses (CWE)
References
- https://github.com/h2o/h2o/commit/8c0eca3PatchThird Party Advisory
- https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4Third Party Advisory
- https://github.com/h2o/h2o/commit/8c0eca3PatchThird Party Advisory
- https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4Third Party Advisory
FAQ
What is CVE-2021-43848?
CVE-2021-43848 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 ...
How severe is CVE-2021-43848?
CVE-2021-43848 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43848?
Check the references section above for vendor advisories and patch information. Affected products include: Dena H2O.