Executive Summary

Titlelibssh Authentication Bypass Vulnerability Affecting Cisco Products: October 2018
Namecisco-sa-20181019-libsshFirst vendor Publication2018-10-19
VendorCiscoLast vendor Modification2018-10-19
Severity (Vendor) N/ARevisionN/A

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:N)
Cvss Base Score6.4Attack RangeNetwork
Cvss Impact Score4.9Attack ComplexityLow
Cvss Expoit Score10AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in libssh could allow an unauthenticated, remote attacker to bypass authentication on a targeted system.

The vulnerability is due to improper authentication operations by the server-side state machine of the affected software. An attacker could exploit this vulnerability by presenting a SSH2_MSG_USERAUTH_SUCCESS message to a targeted system. A successful exploit could allow the attacker to bypass authentication and gain unauthorized access to a targeted system.

This advisory will be updated as additional information becomes available.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181019-libssh ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181019-libssh"]


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

100 %CWE-287Improper Authentication

CPE : Common Platform Enumeration


SAINT Exploits

libssh authentication bypassMore info here

Nessus® Vulnerability Scanner

2018-10-22Name : The remote Fedora host is missing a security update.
File : fedora_2018-bca1c1ab49.nasl - Type : ACT_GATHER_INFO
2018-10-19Name : The remote Debian host is missing a security update.
File : debian_DLA-1548.nasl - Type : ACT_GATHER_INFO
2018-10-18Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4322.nasl - Type : ACT_GATHER_INFO
2018-10-18Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_2383767cd22411e89623a4badb2f4699.nasl - Type : ACT_GATHER_INFO
2018-10-17Name : The remote Slackware host is missing a security update.
File : Slackware_SSA_2018-289-01.nasl - Type : ACT_GATHER_INFO
2018-10-17Name : The remote server is vulnerable to an authentication bypass.
File : libssh_0_8_4.nasl - Type : ACT_GATHER_INFO
2018-10-17Name : 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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2018-10-20 09:18:35
  • First insertion