Cisco Security Advisory: Cisco IOS and IOS XE Software AAA Login Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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Cisco Security Advisory: Cisco IOS and IOS XE Software AAA Login Denial of 
Service Vulnerability

Advisory ID:  cisco-sa-20160928-aaados

Revision: 1.0

For Public Release: 2016 September 28 16:00  GMT

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Summary
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A vulnerability in the Authentication, Authorization, and Accounting (AAA) 
service for remote Secure Shell Host (SSH) connections to the device for Cisco 
IOS and IOS XE Software could allow an unauthenticated, remote attacker to 
cause the vulnerable device to reload.

The vulnerability is due to an error log message when a remote SSH connection 
to the device fails AAA authentication. An attacker could exploit this 
vulnerability by attempting to authenticate to the targeted device. An exploit 
could allow the attacker to cause a denial of service (DoS) condition.

Cisco has released software updates that address this vulnerability. There is a 
workaround that addresses this vulnerability.

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-aaados

This advisory is part of the September 28, 2016, release of the Cisco IOS and 
IOS XE Software Security Advisory Bundled Publication, which includes 10 Cisco 
Security Advisories that describe 11 vulnerabilities. All the vulnerabilities 
have a Security Impact Rating of High. For a complete list of the advisories 
and links to them, see Cisco Event Response: September 2016 Semiannual Cisco 
IOS and IOS XE Software Security Advisory Bundled Publication.

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