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CVE-2023-50247— h2o QUIC state exhaustion DoS

Quick assessment

Affected
h2o h2o
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

H2O是一个用于分布式、可扩展机器学习的内存平台。 H2O 43f86e5之前版本存在安全漏洞，该漏洞源于应用使用 QUIC 堆栈，远程攻击者利用该漏洞可以逐步增加 QUIC 堆栈保留的内存，最终会导致 H2O 内存耗尽而中止。

CVSS 3.7 · Low EPSS 0.86% · P57

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-50247

Vulnerability Information
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Vulnerability Title
h2o QUIC state exhaustion DoS
Source: CVE Program / CVE List V5
Vulnerability Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
H2O 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H2O是一个用于分布式、可扩展机器学习的内存平台。 H2O 43f86e5之前版本存在安全漏洞，该漏洞源于应用使用 QUIC 堆栈，远程攻击者利用该漏洞可以逐步增加 QUIC 堆栈保留的内存，最终会导致 H2O 内存耗尽而中止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
h2o h2o <= 2.3.0-beta2 -

II. Public POCs for CVE-2023-50247

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III. Intelligence Information for CVE-2023-50247

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Patches & Fixes for CVE-2023-50247 (1)

Vendor Advisories for CVE-2023-50247 (1)

IV. Related Vulnerabilities

Same product: h2o
Same vendor: h2o
Same weakness: CWE-770

V. Comments for CVE-2023-50247

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