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Red Hat 7 RHSA-2018-0591-01 Critical Python-Paramiko Auth Bypass Issue

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Calendar Grey March 26, 2018
Scroller Redhat
Critical security patch deployed for python-paramiko within RHEL 7, rectifying significant weaknesses in SSH2 protocol.
An update for python-paramiko is now available for Red Hat Enterprise Linux 7 Extras

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

The python-paramiko package provides a Python module that implements the SSH2 protocol for encrypted and authenticated connections to remote machines. Unlike SSL, the SSH2 protocol does not require hierarchical certificates signed by a powerful central authority. The protocol also includes the ability to open arbitrary channels to remote services across an encrypted tunnel.
Security Fix(es):
* python-paramiko: Authentication bypass in transport.py (CVE-2018-7750)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* python-paramiko has been using the python2-pyasn1 package, but did not depend on it. With new versions of python2-cryptography, python2-pyasn1 was not getting installed and this caused python-paramiko to malfunction. This bug was fixed by making python-paramiko depend on python2-pyasn1 explicitly. (BZ#1559133)

Topics%20covered

Topics Covered

security advisory security update Red Hat security fix critical severity authentication bypass python

References

https://access.redhat.com/security/cve/CVE-2018-7750 https://access.redhat.com/security/updates/classification/#critical

Package List

Red Hat Enterprise Linux 7 Extras:
Source: python-paramiko-2.1.1-4.el7.src.rpm
noarch: python-paramiko-2.1.1-4.el7.noarch.rpm python-paramiko-doc-2.1.1-4.el7.noarch.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/


Severity
critical
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:0591-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0591
Issue date: 2018-03-26

Topic

An update for python-paramiko is now available for Red Hat Enterprise Linux7 Extras.Red Hat Product Security has rated this update as having a security impactof Critical. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat security fix critical severity authentication bypass python

Relevant Releases Architectures

Red Hat Enterprise Linux 7 Extras - noarch

Bugs Fixed

1557130 - CVE-2018-7750 python-paramiko: Authentication bypass in transport.py

1559133 - Missing requirements in python-paramiko

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