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CVE-2018-7750

Publication date 13 March 2018

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

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

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

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
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)

Other references