CVE-2024-45397 H2O alllows bypassing address-based access control with 0-RTT

What is CVE-2024-45397?

CVE-2024-45397 is a medium-severity vulnerability in h2o, published on 11 Oct 2024.

Official description

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.

Weakness: CWE-290, CWE-284

Which versions are affected by CVE-2024-45397?

It affects 1 product.

Products include Dena H2o.

How do I fix CVE-2024-45397?

No fix has been published for CVE-2024-45397 yet. Limit exposure of the affected software until one is available.

Is CVE-2024-45397 being exploited?

There is no known exploitation of CVE-2024-45397 in the wild and no public exploit code.

Other vulnerabilities in h2o

• CVE-2018-0608 Memory corruption in H2O Critical 9.8
• CVE-2016-7835 Use after free in H2O Critical 9.1
• CVE-2023-30847 H2O vulnerable to read from uninitialized pointer in the reverse proxy handler High 8.2
• CVE-2017-10868 Denial of service in H2O High 7.5
• CVE-2017-10869 Memory corruption in H2O High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2024-45397, GHSA-jf2c-xjcp-wg4c, UBUNTU-CVE-2024-45397.