Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service
CVE-2019-9511

7.5HIGH

Key Information:

Vendor
Apple
Status
Swiftnio
Vendor
CVE Published:
13 August 2019

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 27%

Summary

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

ingress-nginx-0.21-1.19.5
Created by flyniu666

References

https://kb.cert.org/vuls/id/605641/
third-party-advisoryx_refsource_CERT-VN
https://usn.ubuntu.com/4099-1/
vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

EPSS Score

27% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to Jonathan Looney of Netflix for reporting this vulnerability.
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