CVE-2024-45403 Information

Description

h2o is an HTTP server with support for HTTP/1.x HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default the h2o standalone server automatically restarts minimizing the impact. However HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.

Reference

https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92 https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562 https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c https://h2o.examp1e.net/configure/http3_directives.html