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🛡️ GHSA-gpgx-whwh-r297 — swift-nio-http2 (CVE-2022-24668)

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-241 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Duplicate advisory: swift-nio-http2 vulnerable to denial of service via ALTSVC or ORIGIN frames

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-pgfx-g6rc-8cjv. This link is maintained to preserve external references.

Original Description

A program using swift-nio-http2 is vulnerable to a denial of service attack caused by a network peer sending ALTSVC or ORIGIN frames. This attack affects all swift-nio-http2 versions from 1.0.0 to 1.19.1. This vulnerability is caused by a logical error after frame parsing but before frame handling. ORIGIN and ALTSVC frames are not currently supported by swift-nio-http2, and should be ignored. However, one code path that encounters them has a deliberate trap instead. This was left behind from the original development process and was never removed. Sending an ALTSVC or ORIGIN frame does not require any special permission, so any HTTP/2 connection peer may send such a frame. For clients, this means any server to which they connect may launch this attack. For servers, anyone they allow to connect to them may launch such an attack. The attack is low-effort: it takes very little resources to send one of these frames. The impact on availability is high: receiving the frame immediately crashes the server, dropping all in-flight connections and causing the service to need to restart. It is straightforward for an attacker to repeatedly send these frames, so attackers require very few resources to achieve a substantial denial of service. The attack does not have any confidentiality or integrity risks in and of itself. This is a controlled, intentional crash. However, sudden process crashes can lead to violations of invariants in services, so it is possible that this attack can be used to trigger an error condition that has confidentiality or integrity risks. The risk can be mitigated if untrusted peers can be prevented from communicating with the service. This mitigation is not available to many services. The issue is fixed by rewriting the parsing code to correctly handle the condition. The issue was found by automated fuzzing by oss-fuzz.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

GHSA-gpgx-whwh-r297 is classified as CWE-241: Improper Handling of Unexpected Data Type. The product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).

Affected software

GHSA-gpgx-whwh-r297 is recorded against 1 package.

  • github.com/apple/swift-nio-http2

Timeline and source

Published on 11 February 2022 and last revised on 19 June 2023. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-241
Public Exploit ✅ No
Source OSV
Published 2022-02-11
Updated 2026-08-20
Modified 2023-06-19
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/apple/swift-nio-http2 — —

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