A vulnerability in credential authentication for valid and invalid username-password pairs for Cisco FireSIGHT System Software could allow an unauthenticated, remote attacker to determine a list of valid usernames for an affected device.
The vulnerability is due to implementation details of how system credentials are verified by the affected software. An attacker could exploit this vulnerability by using a combination of valid system logins, invalid system logins, and time variability to try to continuously authenticate to a device. An exploit could allow the attacker to obtain a list of valid system usernames. The list contains valid usernames only. The list does not contain any associated passwords.
Cisco has not released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-FireSIGHT1
There are no workarounds that address this vulnerability.
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade 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 Technical Assistance Center (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 1.0 Initial public release. — Final 2016-March-02
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