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Fedora 26 : python-paramiko (2018-c1769746da)

critical Nessus Plugin ID 108779

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Synopsis

The remote Fedora host is missing a security update.

Description

A flaw was found in the implementation of `transport.py` in Paramiko, which did not properly check whether authentication was completed before processing other requests. A customized SSH client could simply skip the authentication step.

This flaw is a user authentication bypass in the SSH Server functionality of Paramiko. Where Paramiko is used only for its client-side functionality (e.g. `paramiko.SSHClient`), the vulnerability is not exposed and thus cannot be exploited.

This update also fixes an issue where Ed25519 auth key decryption raised an unexpected exception when given a unicode password string (typical in Python 3).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected python-paramiko package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c1769746da

Plugin Details

Severity: Critical

ID: 108779

File Name: fedora_2018-c1769746da.nasl

Version: 1.7

Type: local

Agent: unix

Published: 4/2/2018

Updated: 1/6/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:26, p-cpe:/a:fedoraproject:fedora:python-paramiko

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/1/2018

Vulnerability Publication Date: 3/13/2018

Reference Information

CVE: CVE-2018-7750