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Denial of Service via reachable assertion

High severity GitHub Reviewed Published Mar 23, 2022 in grpc/grpc-swift • Updated Feb 9, 2024

Package

swift github.com/grpc/grpc-swift (Swift)

Affected versions

< 1.7.2

Patched versions

1.7.2

Description

A grpc-swift server is vulnerable to a denial of service attack via a reachable assertion. This was due to incorrect logic when handling GOAWAY frames.

The attack is low-effort: it takes very little resources to construct and send the required sequence of frames. The impact on availability is high as the server will crash, dropping all in flight connections and requests.

The issue was discovered by automated fuzz testing and is resolved by fixing the relevant state handling code.

References

@glbrntt glbrntt published to grpc/grpc-swift Mar 23, 2022
Published by the National Vulnerability Database Mar 25, 2022
Published to the GitHub Advisory Database Jun 9, 2023
Reviewed Jun 9, 2023
Last updated Feb 9, 2024

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

EPSS score

0.088%
(39th percentile)

Weaknesses

CVE ID

CVE-2022-24777

GHSA ID

GHSA-r6ww-5963-7r95

Source code

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