CVE-2018-0277 Denial of service in Cisco Identity Services Engine

High 8.6 Published 17 May 2018 Updated 29 Nov 2024

An unauthenticated remote attacker can cause a denial of service on Cisco ISE by sending a crafted EAP-TLS certificate, triggering an unexpected application server restart.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-0277?

CVE-2018-0277 is a high-severity denial of service vulnerability in Cisco Identity Services Engine, published on 17 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) certificate validation during EAP authentication for the Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause the ISE application server to restart unexpectedly, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to incomplete input validation of the client EAP-TLS certificate. An attacker could exploit this vulnerability by initiating EAP authentication over TLS to the ISE with a crafted EAP-TLS certificate. A successful exploit could allow the attacker to restart the ISE application server, resulting in a DoS condition on the affected system. The ISE application could continue to restart while the client attempts to establish the EAP authentication connection. If an attacker attempted to import the same EAP-TLS certificate to the ISE trust store, it could trigger a DoS condition on the affected system. This exploit vector would require the attacker to have valid administrator credentials. The vulnerability affects Cisco ISE, Cisco ISE Express, and Cisco ISE Virtual Appliance. Cisco Bug IDs: CSCve31857.

Weakness: CWE-295

Which versions are affected by CVE-2018-0277?

It affects 1 product.

Products include Cisco Identity Services Engine.

How do I fix CVE-2018-0277?

No fix has been published for CVE-2018-0277 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-0277 being exploited?

There is no known exploitation of CVE-2018-0277 in the wild and no public exploit code.

All Cisco Identity Services Engine vulnerabilities

Sources

Also known as GHSA-7hf4-2cmf-xpcc.