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CVE-2024-45403— H2O assertion failure when HTTP/3 requests are cancelled

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H2O.ai开源的一个用于分布式、可扩展机器学习的内存平台。 H2O存在安全漏洞，该漏洞源于当配置为反向代理并且客户端取消HTTP/3请求时，可能会因断言失败而崩溃，攻击者可以利用此崩溃发起拒绝服务攻击。

CVSS 3.7 · Low EPSS 0.65% · P50

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-45403

Vulnerability Information
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Vulnerability Title
H2O assertion failure when HTTP/3 requests are cancelled
Source: CVE Program / CVE List V5
Vulnerability Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
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
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
H2O 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H2O是H2O.ai开源的一个用于分布式、可扩展机器学习的内存平台。 H2O存在安全漏洞，该漏洞源于当配置为反向代理并且客户端取消HTTP/3请求时，可能会因断言失败而崩溃，攻击者可以利用此崩溃发起拒绝服务攻击。
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 >= 16b13eee8ad7895b4fe3fcbcabee53bd52782562, < 1ed32b23f999acf0c5029f09c8525f93eb1d354c -

II. Public POCs for CVE-2024-45403

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III. Intelligence Information for CVE-2024-45403

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Patches & Fixes for CVE-2024-45403 (1)

Vendor Advisories for CVE-2024-45403 (1)

Same Patch Batch · h2o · 2024-10-11 · 5 CVEs total

CVE-2024-45402 8.6 HIGH Picotls double free
CVE-2024-45396 7.5 HIGH Quicly assertion failures
CVE-2024-45397 5.9 MEDIUM H2O alllows bypassing address-based access control with 0-RTT
CVE-2024-25622 3.1 LOW H2O ignores headers configuration directives

IV. Related Vulnerabilities

Same product: h2o
Same vendor: h2o
Same weakness: CWE-617

V. Comments for CVE-2024-45403

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