CVE-2018-0277: Input Validation
First published: Thu May 17 2018(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Identity Services Engine (ISE) | =2.0\(0.306\) | |
| Cisco Identity Services Engine (ISE) | =2.0\(1.130\) | |
| Cisco Identity Services Engine (ISE) | =2.1\(0.474\) | |
| Cisco Identity Services Engine (ISE) | =2.2\(0.470\) |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2018-0277?
CVE-2018-0277 has been classified as a medium severity vulnerability, as it can lead to denial of service.
How do I fix CVE-2018-0277?
To fix CVE-2018-0277, update your Cisco Identity Services Engine to a version that is not affected by this vulnerability.
What versions of Cisco Identity Services Engine are affected by CVE-2018-0277?
CVE-2018-0277 affects Cisco Identity Services Engine versions 2.0(0.306), 2.0(1.130), 2.1(0.474), and 2.2(0.470).
Can CVE-2018-0277 be exploited remotely?
Yes, CVE-2018-0277 can be exploited by an unauthenticated, remote attacker.
What impact does CVE-2018-0277 have on the Cisco Identity Services Engine?
CVE-2018-0277 can cause the Cisco Identity Services Engine application server to restart unexpectedly.
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- canonical/cisco identity services engine (ise)
- version/cisco identity services engine (ise)/2.0\(0.306\)
- version/cisco identity services engine (ise)/2.0\(1.130\)
- version/cisco identity services engine (ise)/2.1\(0.474\)
- version/cisco identity services engine (ise)/2.2\(0.470\)