Vulnerability identifier: #VU12786

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0277

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Identity Services Engine (ISE)
Server applications / Other server solutions

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) certificate validation during EAP authentication due to incomplete input validation of the client EAP-TLS certificate. A remote attacker can initiate EAP authentication over TLS to the ISE with a specially crafted EAP-TLS certificate and cause the service to crash.

Mitigation
Update to version 2.2(0.905).

Vulnerable software versions

Cisco Identity Services Engine (ISE): 2.0.0.306 - 2.2.0.470

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180516-iseeap

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.