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Vulnerability of Cisco IOS, IOS XE: denial of service via TACACS

Synthesis of the vulnerability 

An attacker can generate a fatal error via TACACS of Cisco IOS and IOS XE, in order to trigger a denial of service.
Vulnerable software: Cisco ASR, Cisco Catalyst, IOS by Cisco, IOS XE Cisco, Cisco Router.
Severity of this announce: 2/4.
Creation date: 27/09/2018.
Références of this computer vulnerability: CERTFR-2018-AVI-458, cisco-sa-20180926-tacplus, CSCux66796, CVE-2018-15369, VIGILANCE-VUL-27343.

Description of the vulnerability 

An attacker can generate a fatal error via TACACS of Cisco IOS and IOS XE, in order to trigger a denial of service.
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This vulnerability announce impacts software or systems such as Cisco ASR, Cisco Catalyst, IOS by Cisco, IOS XE Cisco, Cisco Router.

Our Vigil@nce team determined that the severity of this cybersecurity threat is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer threat bulletin.

Solutions for this threat 

Cisco IOS, IOS XE: solution CSCux66796.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCux66796
  https://tools.cisco.com/bugsearch/bug/CSCux66796
  https://tools.cisco.com/quickview/bug/CSCux66796
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