CVE-2022-0618
First published: Wed Mar 09 2022(Updated: )
A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This attack affects all swift-nio-http2 versions from 1.0.0 to 1.19.2. It is fixed in 1.20.0 and later releases. This vulnerability is caused by a logical error when parsing a HTTP/2 HEADERS or HTTP/2 PUSH_PROMISE frame where the frame contains padding information without any other data. This logical error caused confusion about the size of the frame, leading to a parsing error. This parsing error immediately crashes the entire process. Sending a HEADERS frame or PUSH_PROMISE frame with HTTP/2 padding information 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 an appropriately crafted frame. 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 appropriately crafted 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: swift-nio-http2 is parsing the frame in memory-safe code, so the crash is safe. 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.
Credit: cve@forums.swift.org cve@forums.swift.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| swift/github.com/apple/swift-nio-http2 | >=1.0.0<1.20 | 1.20 |
| Apple Swiftnio Http\/2 Swift | >=1.0.0<1.20.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-0618?
CVE-2022-0618 is a vulnerability in programs using swift-nio-http2 that allows a denial of service attack by a specially crafted HTTP/2 frame.
How does CVE-2022-0618 work?
CVE-2022-0618 is caused by a logical error when parsing a HTTP/2 HEADERS or HTTP/2 PUSH_PROMISE frame.
What is the severity of CVE-2022-0618?
The severity of CVE-2022-0618 is high, with a CVSS score of 7.5.
Which software is affected by CVE-2022-0618?
Programs using swift-nio-http2 versions 1.0.0 to 1.20.0 are affected by CVE-2022-0618.
How can CVE-2022-0618 be fixed?
To fix CVE-2022-0618, update affected software to a version beyond 1.20.0 of swift-nio-http2.
- agent/type
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-q36x-r5x4-h4q6
- alias/CVE-2022-0618
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- agent/references
- agent/severity
- agent/weakness
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- package-manager/swift
- vendor/apple
- canonical/apple swiftnio http\/2 swift
- version/apple swiftnio http\/2 swift/1.0.0