CVE-2023-46445

Publication date 14 November 2023

Last updated 11 July 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An issue in AsyncSSH before 2.14.1 allows attackers to control the extension info message (RFC 8308) via a man-in-the-middle attack, aka a “Rogue Extension Negotiation.”

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-asyncssh	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.10.1-2ubuntu0.1+esm1
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 2.5.0-1ubuntu0.1
	20.04 LTS focal	Fixed 1.12.2-1ubuntu0.2
	18.04 LTS bionic	Fixed 1.11.1-1ubuntu0.1~esm2
	16.04 LTS xenial	Ignored backporting risks regressions
	14.04 LTS trusty	Ignored end of standard support

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Notes

shishirsub10

python-asyncssh in esm-apps/xenial is currently FTBFS. fixing FTBFS requires version upgrade of python-bcrypt from 2.0.0 to 3.0.0

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python-asyncssh	Upstream: 83e43f5

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N