CVE-2018-0277: cisco identity_services_engine Improper Certificate Validation

Vulnerability summary

CVE-2018-0277 is a high (CVSS 8.6) Improper Certificate Validation vulnerability in cisco identity_services_engine. EPSS estimates a 2.38% chance of exploitation in the next 30 days, higher than 83.5% of scored vulnerabilities.

Timeline

1. 17-05-2018
   PublishedVulnerability first disclosed.
2. 29-11-2024
   Last modifiedVulnerability information updated.

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.

• CWE-295Improper Certificate ValidationThe product does not validate, or incorrectly validates, a certificate.