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CVE-2024-45397

H2O alllows bypassing address-based access control with 0-RTT

Published: Oct 11, 2024Updated: Nov 12, 2024 Sources: CVE List NVDCWE-284
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.4%
Top 65.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-284CWE-290

Affected Products

h2odena
SaaS
Cloud & SaaS
h2oh2o
On-prem
Networking Infrastructure / load-balancer-proxy
denacommercialCloud & SaaSaka dena inc
h2ooss-projectNetworking Infrastructureaka h2o web server, h2o, picotls, quicly

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a
github.com
https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c
github.com
https://h2o.examp1e.net/configure/http3_directives.html
h2o.examp1e.net

Timeline

Published
Oct 11, 2024
Last Updated
Nov 12, 2024

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