Executive Summary

Summary
Title libssh vulnerability
Informations
Name USN-3795-1 First vendor Publication 2018-10-17
Vendor Ubuntu Last vendor Modification 2018-10-17
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:N)
Cvss Base Score 6.4 Attack Range Network
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

libssh could allow unintended access to network services.

Software Description: - libssh: A tiny C SSH library

Details:

Peter Winter-Smith discovered that libssh incorrectly handled authentication when being used as a server. A remote attacker could use this issue to bypass authentication without any credentials.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS:
libssh-4 0.8.0~20170825.94fa1e38-1ubuntu0.1

Ubuntu 16.04 LTS:
libssh-4 0.6.3-4.3ubuntu0.1

Ubuntu 14.04 LTS:
libssh-4 0.6.1-0ubuntu3.4

After a standard system update you need to reboot your computer to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3795-1
CVE-2018-10933

Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.8.0~20170825.94fa1e38-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libssh/0.6.3-4.3ubuntu0.1
https://launchpad.net/ubuntu/+source/libssh/0.6.1-0ubuntu3.4

Original Source

Url : http://www.ubuntu.com/usn/USN-3795-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-287 Improper Authentication

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 14
Application 2
Application 1
Application 1
Application 1
Os 4
Os 2
Os 1

SAINT Exploits

Description Link
libssh authentication bypass More info here

Nessus® Vulnerability Scanner

Date Description
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-6b390ceb36.nasl - Type : ACT_GATHER_INFO
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-c08cd808d3.nasl - Type : ACT_GATHER_INFO
2018-10-22 Name : The remote Fedora host is missing a security update.
File : fedora_2018-bca1c1ab49.nasl - Type : ACT_GATHER_INFO
2018-10-19 Name : The remote Debian host is missing a security update.
File : debian_DLA-1548.nasl - Type : ACT_GATHER_INFO
2018-10-18 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4322.nasl - Type : ACT_GATHER_INFO
2018-10-18 Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_2383767cd22411e89623a4badb2f4699.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote Slackware host is missing a security update.
File : Slackware_SSA_2018-289-01.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote server is vulnerable to an authentication bypass.
File : libssh_0_8_4.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote server is vulnerable to an authentication bypass.
File : libssh_0_8_4_remote.nasl - Type : ACT_ATTACK

Alert History

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0
1
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Date Informations
2019-01-17 00:21:38
  • Multiple Updates
2018-10-23 17:21:51
  • Multiple Updates
2018-10-18 17:21:57
  • Multiple Updates
2018-10-17 17:21:47
  • Multiple Updates
2018-10-17 17:18:42
  • First insertion