CVE-2024-45397: 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…

high7.5CVSS 3.1

AVNACLPRNUINSUCHINAN

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

3 ranges

Vendor	Product	Version range	Fixed in
debian	h2o	—	—
dena	h2o	< 2024-10-10	2024-10-10
h2o	h2o	< 15ed15a2efb83a77bb4baaa5a119e639c2f6898a	15ed15a2efb83a77bb4baaa5a119e639c2f6898a

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

osv7.5HIGH