Reachable Assertion Affecting h2o/h2o package, versions [0,]


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    EPSS
    0.05% (17th percentile)

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  • Snyk ID SNYK-UNMANAGED-H2OH2O-8184978
  • published 13 Oct 2024
  • disclosed 11 Oct 2024
  • credit Unknown

How to fix?

A fix was pushed into the master branch but not yet published.

Overview

Affected versions of this package are vulnerable to Reachable Assertion when the server is configured as a reverse proxy and client-initiated cancellations of HTTP/3 requests occur. An attacker can cause the server to crash by sending specially crafted cancellation requests.

Note: This vulnerability has been fixed since commit 1ed32b2

Workaround

To mitigate this issue, users can disable the use of HTTP/3.

To do so, remove or comment out the listen directives using the quic type or attribute.

CVSS Scores

version 4.0
version 3.1
Expand this section

Snyk

Recommended
6.3 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Attack Requirements (AT)
    Present
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Confidentiality (VC)
    None
  • Integrity (VI)
    None
  • Availability (VA)
    Low
  • Confidentiality (SC)
    None
  • Integrity (SI)
    None
  • Availability (SA)
    None