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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181019-libssh
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181019-libssh
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.
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 ModemsFor 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.
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.
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.
| Version | 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 |
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