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.

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2860 advisory.

  - Paramiko version 2.4.1, 2.3.2, 2.2.3, 2.1.5, 2.0.8, 1.18.5, 1.17.6 contains a Incorrect Access Control     vulnerability in SSH server that can result in RCE. This attack appear to be exploitable via network     connectivity. (CVE-2018-1000805)

  - 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. (CVE-2018-7750)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 4.05, has python-paramiko packages installed that are affected by a vulnerability:

  - It was found that when acting as an SSH server, paramiko     did not properly check whether authentication is     completed before processing other requests. A customized     SSH client could use this to bypass authentication when     accessing any resources controlled by paramiko.
    (CVE-2018-7750)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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.

CVE-2018-1000805 Fix to prevent malicious clients to trick the Paramiko server into thinking an unauthenticated client is authenticated.

CVE-2018-7750 Fix check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.

For Debian 8 'Jessie', these problems have been fixed in version 1.15.1-1+deb8u1.

We recommend that you upgrade your paramiko packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for rhvm-appliance is now available for Red Hat Virtualization 4 for RHEL 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The RHV-M Virtual Appliance automates the process of installing and configuring the Red Hat Virtualization Manager. The appliance is available to download as an OVA file from the Customer Portal.

The following packages have been upgraded to a later upstream version:
rhvm-appliance (4.2). (BZ#1558801, BZ#1563545)

Security Fix(es) :

* python-paramiko: Authentication bypass in transport.py (CVE-2018-7750)

* slf4j: Deserialisation vulnerability in EventData constructor can allow for arbitrary code execution (CVE-2018-8088)

* undertow: Client can use bogus uri in Digest authentication (CVE-2017-12196)

* jackson-databind: unsafe deserialization due to incomplete blacklist (incomplete fix for CVE-2017-7525 and CVE-2017-17485) (CVE-2018-5968)

* ovirt-engine: account enumeration through login to web console (CVE-2018-1073)

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.

Red Hat would like to thank Chris McCown for reporting CVE-2018-8088.
The CVE-2017-12196 issue was discovered by Jan Stourac (Red Hat).

Enhancement(s) :

* Previously, the default memory allotment for the RHV-M Virtual Appliance was always large enough to include support for user additions.

In this release, the RHV-M Virtual Appliance includes a swap partition that enables the memory to be increased when required. (BZ#1422982)

* Previously, the partitioning scheme for the RHV-M Virtual Appliance included two primary partitions, '/' and swap.

In this release, the disk partitioning scheme has been modified to match the scheme specified by NIST. The updated disk partitions are as follows :

/boot 1G (primary) /home 1G (lvm) /tmp 2G (lvm) /var 20G (lvm) /var/log 10G (lvm) /var/log/audit 1G (lvm) swap 8G (lvm) / 6G (primary) (BZ#1463853)

* Previously, the version tag was used as part of the RPM's naming scheme, for example, '4.1.timestamp', which created differences between the upstream and downstream versioning schemes. In this release, the downstream versioning scheme is aligned with the upstream scheme and the timestamp has moved from the version tag to the release tag. (BZ#1464486)

An update for python-paramiko is now available for Red Hat Virtualization 4 Management Agent for RHEL 7 and Red Hat Virtualization Manager 4.1.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

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.

The following packages have been upgraded to a later upstream version:
python-paramiko (2.1.1). (BZ#1562393)

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.

An update for python-paramiko is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

An update for python-paramiko is now available for Red Hat Ansible Engine 2.4 for RHEL 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

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.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Fix and enable tests (%check).

  - Backport a change which makes tests exit with nonzero     status when they fail.

  - Add a fix for upstream tests for CVE-2018-7750 (broken     in previous).

  - Fix a security flaw (CVE-2018-7750) in Paramiko's server     mode (emphasis on **server** mode  this does **not**     impact *client* use!) Backported from 1.10: Resolves     #1557140

Security Fix(es) :

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

An update for python-paramiko is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support, Red Hat Enterprise Linux 6.5 Advanced Update Support, Red Hat Enterprise Linux 6.6 Advanced Update Support, Red Hat Enterprise Linux 6.6 Telco Extended Update Support, and Red Hat Enterprise Linux 6.7 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

From Red Hat Security Advisory 2018:1124 :

An update for python-paramiko is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

An update for python-paramiko is now available for Red Hat Ansible Engine 2 for RHEL 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

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.

Authentication bypass in transport.py

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.
(CVE-2018-7750 )

An update for python-paramiko is now available for Red Hat Enterprise Linux 7 Extras.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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)

This update for python-paramiko fixes the following issues :

  - CVE-2018-7750: Fixed transport.py in the SSH server     implementation of Paramiko that does not properly check     whether authentication is completed before processing     other requests (bsc#1085276).

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.

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

ID	Name	Product	Family	Severity
156334	Debian DLA-2860-1 : paramiko - LTS security update	Nessus	Debian Local Security Checks	critical
127400	NewStart CGSL MAIN 4.05 : python-paramiko Vulnerability (NS-SA-2019-0138)	Nessus	NewStart CGSL Local Security Checks	critical
120611	Fedora 28 : python-paramiko (2018-8f9d81a3fb)	Nessus	Fedora Local Security Checks	critical
118469	Debian DLA-1556-1 : paramiko security update	Nessus	Debian Local Security Checks	critical
109910	RHEL 7 : Virtualization (RHSA-2018:1525)	Nessus	Red Hat Local Security Checks	critical
109567	RHEL 7 : Virtualization (RHSA-2018:1274)	Nessus	Red Hat Local Security Checks	critical
109526	CentOS 6 : python-paramiko (CESA-2018:1124)	Nessus	CentOS Local Security Checks	critical
109387	RHEL 7 : python-paramiko (RHSA-2018:1213)	Nessus	Red Hat Local Security Checks	critical
109157	OracleVM 3.3 / 3.4 : python-paramiko (OVMSA-2018-0034)	Nessus	OracleVM Local Security Checks	critical
109057	Scientific Linux Security Update : python-paramiko on SL6.x (noarch) (20180412)	Nessus	Scientific Linux Local Security Checks	critical
109027	RHEL 6 : python-paramiko (RHSA-2018:1125)	Nessus	Red Hat Local Security Checks	critical
109026	RHEL 6 : python-paramiko (RHSA-2018:1124)	Nessus	Red Hat Local Security Checks	critical
109025	Oracle Linux 6 : python-paramiko (ELSA-2018-1124)	Nessus	Oracle Linux Local Security Checks	critical
108982	RHEL 7 : python-paramiko (RHSA-2018:0646)	Nessus	Red Hat Local Security Checks	critical
108850	Amazon Linux AMI : python-paramiko (ALAS-2018-989)	Nessus	Amazon Linux Local Security Checks	critical
108779	Fedora 26 : python-paramiko (2018-c1769746da)	Nessus	Fedora Local Security Checks	critical
108643	RHEL 7 : python-paramiko (RHSA-2018:0591)	Nessus	Red Hat Local Security Checks	critical
108632	openSUSE Security Update : python-paramiko (openSUSE-2018-305)	Nessus	SuSE Local Security Checks	critical
108514	Ubuntu 14.04 LTS / 16.04 LTS : Paramiko vulnerability (USN-3603-1)	Nessus	Ubuntu Local Security Checks	critical

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