CVE-2022-21716

Published: 3 March 2022

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, Twisted SSH client and server implement is able to accept an infinite amount of data for the peer's SSH version identifier. This ends up with a buffer using all the available memory. The attach is a simple as `nc -rv localhost 22 < /dev/zero`. A patch is available in version 22.2.0. There are currently no known workarounds.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
twisted Launchpad, Ubuntu, Debian	bionic	Released (17.9.0-2ubuntu0.3)
	focal	Released (18.9.0-11ubuntu0.20.04.2)
	impish	Released (20.3.0-7ubuntu1.1)
	jammy	Released (22.1.0-2ubuntu2.1)
	trusty	Released (13.2.0-1ubuntu1.2+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (22.2.0)
	xenial	Released (16.0.0-1ubuntu0.4+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

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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