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HTTP/2 Rapid Reset

High
kazuho published GHSA-2m7v-gc89-fjqf Oct 10, 2023

Package

h2o (h2o)

Affected versions

commits up to cb9f500

Patched versions

commit 28fe151 or above

Description

Impact

H2O is vulnerable to the HTTP/2 Rapid Reset attack.

An attacker might be able to consume more than adequate amount of processing power of h2o and the backend servers by mounting the attack.

Patches

All commits up to cb9f500 are vulnerable.

The vulnerability is fixed by #3291. Users are advised to upgrade to commit 28fe151 or above that incorporates this pull request.

References

How it works: The novel HTTP/2 ‘Rapid Reset’ DDoS attack

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE ID

CVE-2023-44487

Weaknesses

No CWEs