Cisco Security Advisory
libssh Authentication Bypass Vulnerability Affecting Cisco Products: October 2018
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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 is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181019-libssh
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Cisco investigated its product line to determine which products and services may be affected by this vulnerability.
The Vulnerable Products section will include Cisco bug IDs for each affected product or service. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.
Any product not listed in the Vulnerable Products section of this advisory is to be considered not vulnerable.
Vulnerable Products
Cisco has investigated its product line and has determined that no products or services are known to be affected by this vulnerability.
Products Confirmed Not Vulnerable
Only products and services listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following products and services. All members of the product families in the following list are not considered to be affected by this vulnerability unless they are explicitly listed in the preceding Vulnerable Products section:
Cable Modems
- Cisco Stealthwatch Online Visibility Assessment
Collaboration and Social Media
- Cisco Webex Meetings Server
Endpoint Clients and Client Software
- Cisco Jabber Guest
Network Application, Service, and Acceleration
- Cisco Adaptive Security Appliance (ASA) Software
- Cisco Cloud Services Platform 2100
Network and Content Security Devices
- Cisco ASA Next-Generation Firewall Services
- Cisco Content Security Management Appliance (SMA)
- Cisco Email Security Appliance (ESA)
- Cisco FireSIGHT System
- Cisco Identity Services Engine (ISE)
- Cisco Web Security Appliance (WSA)
Network Management and Provisioning
- Cisco Elastic Services Controller (ESC)
- Cisco Enterprise Service Automation
- Cisco FindIT Network Manager
- Cisco NetFlow Generation Appliance
- Cisco Network Analysis Module
- Cisco Policy Suite
- Cisco Prime Access Registrar
- Cisco Prime Collaboration Provisioning
- Cisco Prime Infrastructure
- Cisco Prime Network Registrar Virtual Appliance
- Cisco Prime Network Registrar
- Cisco Prime Performance Manager
- Cisco WAN Automation Engine (WAE)
Routing and Switching - Enterprise and Service Provider
- Cisco Application Policy Infrastructure Controller (APIC)
- Cisco IOS XR Software for Cisco Network Convergence System 6000 Series Routers
- Cisco IOS XR Software
- Cisco Nexus 9000 Series Switches - Standalone, NX-OS mode
- Cisco Nexus 9000 Series Switches
Unified Computing
- Cisco UCS Director
Voice and Unified Communications Devices
- Cisco IP Interoperability and Collaboration System (IPICS)
- Cisco Management Heartbeat Server
- Cisco Unified Communications Manager Session Management Edition
- Cisco Unified Communications Manager
- Cisco Unified Contact Center Express
Video, Streaming, TelePresence, and Transcoding Devices
- Cisco Cloud Object Storage
- Cisco DCM Series D990x Digital Content Manager
- Cisco VDS Recorder
- Cisco VDS-TV Caching Nodes
- Cisco VDS-TV Streamer
- Cisco VDS-TV Vault
- Cisco Video Distribution Suite for Internet Streaming (VDS-IS/CDS-IS)
- Cisco Video Surveillance 4300E and 4500E High-Definition IP Cameras
- Cisco Video Surveillance Media Server
Wireless
- Cisco Wireless LAN Controller
Cisco Cloud Hosted Services
- Cisco Cloud Email Security
- Cisco Cloudlock
- Cisco Energy Management
- Cisco Smart Software Manager Satellite
- Cisco Stealthwatch Learning Networks License
- Cisco Umbrella
- Cisco Virtual HetNet
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Any workarounds will be documented in the product-specific Cisco bugs, which are identified in the Vulnerable Products section of this advisory.
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For information about fixed software releases, consult the Cisco bugs identified in the Vulnerable Products section of this advisory.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco TAC or their contracted maintenance providers.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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On October 16, 2018, libssh.org publicly disclosed this vulnerability in a security bulletin at the following link: https://www.libssh.org/2018/10/16/libssh-0-8-4-and-0-7-6-security-and-bugfix-release/
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.8 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Final 2018-November-05 1.7 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-31 1.6 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-30 1.5 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-26 1.4 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-25 1.3 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-24 1.2 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-23 1.1 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products Interim 2018-October-22 1.0 Initial public release. - Interim 2018-October-19
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