CVE-2018-7750

Publication date 13 March 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x before 2.2.3, 2.3.x before 2.3.2, and 2.4.x before 2.4.1 does not properly check whether authentication is completed before processing other requests, as demonstrated by channel-open. A customized SSH client can simply skip the authentication step.

From the Ubuntu Security Team

Matthijs Kooijman discovered that Paramiko's SSH server implementation did not properly require authentication before processing requests. An unauthenticated remote attacker could possibly use this to execute arbitrary code.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
paramiko	17.10 artful	Fixed 2.0.0-1ubuntu0.1
	16.04 LTS xenial	Fixed 1.16.0-1ubuntu0.1
	14.04 LTS trusty	Fixed 1.10.1-1git1ubuntu0.1

Patch details

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

Package	Patch details
paramiko	Upstream: fa29bd8

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-3603-2
Paramiko vulnerability
20 March 2018

USN-3603-1
Paramiko vulnerability
20 March 2018