CVE-2024-45397: H2O alllows bypassing address-based access control with 0-RTT
First published: Fri Oct 11 2024(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Dena H20 | <2024-10-10 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-45397?
CVE-2024-45397 is classified as a moderate severity vulnerability affecting the h2o HTTP server.
How do I fix CVE-2024-45397?
To address CVE-2024-45397, update your h2o server to a version released after October 10, 2024.
What software is affected by CVE-2024-45397?
CVE-2024-45397 affects the h2o HTTP server versions prior to 2024-10-10.
What is the impact of CVE-2024-45397 on my server?
CVE-2024-45397 may allow unauthorized access through IP-address-based controls when using early data with TLS/1.3.
Is there a workaround for CVE-2024-45397?
Currently, the recommended solution for CVE-2024-45397 is to upgrade to the latest version of the h2o server.
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