PT-2024-31607 · H2O · H2O

Lowkazu · Published 2024-10-11 · Updated 2024-11-12 · CVE-2024-45403

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: h2o versions prior to the version containing commit 1ed32b2

Description: The issue affects h2o, an HTTP server that supports HTTP/1.x, HTTP/2, and HTTP/3. When configured as a reverse proxy, h2o may crash due to an assertion failure if HTTP/3 requests are cancelled by the client. This crash can be exploited to mount a Denial-of-Service attack. Although the standalone h2o server automatically restarts by default, minimizing the impact, concurrent HTTP requests will still be disrupted.

Recommendations: To mitigate the issue, users may disable the use of HTTP/3 until a patch is available. Update to the version containing commit 1ed32b2 to resolve the issue.

Exploit

Fix

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2024-45403

GHSA-4XP5-3JHC-3M92

Affected Products

H2O

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/45xxx/CVE-2024-45403.json · Exploit
• https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92 · Vendor Advisory
• https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c · Patch
• https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562 · Patch
• https://ubuntu.com/security/CVE-2024-45403 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2024-45403 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2024-45403 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-45403 · Security Note
• https://osv.dev/vulnerability/CVE-2024-45403 · Vendor Advisory
• https://twitter.com/transilienceai/status/1845330841846591839 · Twitter Post
• https://h2o.examp1e.net/configure/http3_directives.html · Note
• https://t.me/cvenotify/101436 · Telegram Post
• https://twitter.com/transilienceai/status/1845330836217872631 · Twitter Post
• https://t.me/cvedetector/7683 · Telegram Post