CVE-2019-9518

Published: 13 August 2019

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.

From the Ubuntu Security Team

It was discovered that Netty incorrectly implements HTTP/2. An attacker could possibly use this issue to cause a denial of service.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
netty Launchpad, Ubuntu, Debian	kinetic	Ignored (end of life, was needed)
	bionic	Released (1:4.1.7-4ubuntu0.1+esm1) Available with Ubuntu Pro
	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	focal	Needed
	trusty	Not vulnerable (code not preent)
	upstream	Needs triage
	xenial	Not vulnerable (code not present)
	groovy	Ignored (end of life)
	hirsute	Ignored (end of life)
	impish	Ignored (end of life)
	jammy	Needed
	lunar	Needed
	mantic	Needed
trafficserver Launchpad, Ubuntu, Debian	kinetic	Ignored (end of life, was needs-triage)
	bionic	Needs triage
	focal	Not vulnerable (8.0.5+ds-3)
	groovy	Ignored (end of life)
	hirsute	Ignored (end of life)
	impish	Ignored (end of life)
	jammy	Needs triage
	lunar	Needs triage
	trusty	Does not exist
	upstream	Needs triage
	xenial	Needs triage
	mantic	Needs triage

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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