CVE-2022-24667

Published on: 02/09/2022 12:00:00 AM UTC

Last Modified on: 02/22/2022 07:04:00 PM UTC

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

Certain versions of Swiftnio Http/2 from Apple contain the following vulnerability:

A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HPACK-encoded header block. This attack affects all swift-nio-http2 versions from 1.0.0 to 1.19.1. There are a number of implementation errors in the parsing of HPACK-encoded header blocks that allow maliciously crafted HPACK header blocks to cause crashes in processes using swift-nio-http2. Each of these crashes is triggered instead of an integer overflow. A malicious HPACK header block could be sent on any of the HPACK-carrying frames in a HTTP/2 connection (HEADERS and PUSH_PROMISE), at any position. Sending a HPACK header block does not require any special permission, so any HTTP/2 connection peer may send one. 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 field block. The impact on availability is high: receiving a frame carrying this field block 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 field blocks, 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 field block in memory-safe code and the crash is triggered instead of an integer overflow. 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 all conditions in the function. The principal issue was found by automated fuzzing by oss-fuzz, but several associated bugs in the same code were found by code audit and fixed at the same time

  • CVE-2022-24667 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Swift Project - SwiftNIO HTTP2 version >= 1.0.0
  • Affected Vendor/Software: URL Logo Swift Project - SwiftNIO HTTP2 version <= 1.19.1

CVSS3 Score: 7.5 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 5 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE NONE PARTIAL

CVE References

Description Tags Link
github.com
text/plain
Inactive LinkNot Archived
URL Logo MISC github.com/apple/swift-nio-http2/security/advisories/GHSA-w3f6-pc54-gfw7

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationAppleSwiftnio Http/2AllAllAllAll
  • cpe:2.3:a:apple:swiftnio_http\/2:*:*:*:*:*:swift:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2022-24667 : A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network p… twitter.com/i/web/status/1… 2022-02-09 23:36:05
Twitter Icon @SecRiskRptSME RT: CVE-2022-24667 A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a networ… twitter.com/i/web/status/1… 2022-02-10 08:33:43
Reddit Logo Icon /r/netcve CVE-2022-24667 2022-02-10 00:39:02
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