CVE-2022-21716

2022-03-0300:00:00

ubuntu.com

twisted

ssh

python

memory exhaustion

cve-2022-21716

patch

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.004

Percentile

73.2%

JSON

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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchtwisted< 17.9.0-2ubuntu0.3UNKNOWN
ubuntu20.04noarchtwisted< 18.9.0-11ubuntu0.20.04.2UNKNOWN
ubuntu21.10noarchtwisted< 20.3.0-7ubuntu1.1UNKNOWN
ubuntu22.04noarchtwisted< 22.1.0-2ubuntu2.1UNKNOWN
ubuntu14.04noarchtwisted< 13.2.0-1ubuntu1.2+esm2UNKNOWN
ubuntu16.04noarchtwisted< 16.0.0-1ubuntu0.4+esm1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	twisted	< 17.9.0-2ubuntu0.3	UNKNOWN
ubuntu	20.04	noarch	twisted	< 18.9.0-11ubuntu0.20.04.2	UNKNOWN
ubuntu	21.10	noarch	twisted	< 20.3.0-7ubuntu1.1	UNKNOWN
ubuntu	22.04	noarch	twisted	< 22.1.0-2ubuntu2.1	UNKNOWN
ubuntu	14.04	noarch	twisted	< 13.2.0-1ubuntu1.2+esm2	UNKNOWN
ubuntu	16.04	noarch	twisted	< 16.0.0-1ubuntu0.4+esm1	UNKNOWN