7.5

CVSS Score

3.1

Basic Information

CVE ID

CVE-2022-0618

GHSA ID

GHSA-q36x-r5x4-h4q6

EPSS Score

0.75655%

CWE

Published

6/9/2023

Updated

2/9/2024

KEV Status

Technology

Swift

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CVE-2022-0618

CVE-2022-0618: Denial of service via HTTP/2 HEADERS frames padding

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.

(GitHub Advisory)

7.5

CVSS Score

3.1

Basic Information

CVE ID

CVE-2022-0618

GHSA ID

GHSA-q36x-r5x4-h4q6

EPSS Score

0.75655%

CWE

Published

6/9/2023

Updated

2/9/2024

KEV Status

Technology

Swift

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/apple/swift-nio-http2	swift	>= 1.0.0, < 1.20	1.20

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stemmed from improper handling of padding in HEADERS/PUSH_PROMISE frames. The commit diff shows:

New state machine transitions (AwaitingPaddingLengthByteParserState) were added to handle padding validation
Added explicit checks for header.length > 0 when padding flag is set
The original code in AccumulatingFrameHeaderParserState.process() didn't properly validate that padded frames must have at least 1 byte for the padding length field
The original AccumulatingPayloadParserState initialization didn't properly handle cases where padding length exceeded remaining payload size
Added explicit protocolError throws when (header.length <= expectedPadding) in the new logic These changes indicate the vulnerable functions were in the frame header processing and payload initialization paths that handled padding validation.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

* pro*r*m usin* swi*t-nio-*ttp* is vuln*r**l* to * **ni*l o* s*rvi** *tt**k, **us** *y * n*twork p**r s*n*in* * sp**i*lly *r**t** *TTP/* *r*m*. T*is *tt**k *****ts *ll swi*t-nio-*ttp* v*rsions *rom *.*.* to *.**.*. It is *ix** in *.**.* *n* l*t*r r*l

Reasoning

T** vuln*r**ility st*mm** *rom improp*r **n*lin* o* p***in* in *****RS/PUS*_PROMIS* *r*m*s. T** *ommit *i** s*ows: *. N*w st*t* m***in* tr*nsitions (*w*itin*P***in*L*n*t**yt*P*rs*rSt*t*) w*r* ***** to **n*l* p***in* v*li**tion *. ***** *xpli*it ****k

7.5

Basic Information

Concerned about an active attack path?

CVE-2022-0618: Denial of service via HTTP/2 HEADERS frames padding

7.5

Basic Information

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability Intelligence
Miggo AI