Cisco Identity Services Engine EAP-TLS certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco Identity Services Engine. This vulnerability affects unknown code of the component EAP-TLS Handler. This manipulation causes certificate validation. This vulnerability is registered as CVE-2018-0277. Remote exploitation of the attack is possible. No exploit is available. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability was found in Cisco Identity Services Engine (Policy Management Software) (the affected version is unknown). It has been declared as problematic. Affected by this vulnerability is an unknown code of the component EAP-TLS Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect availability. The summary by CVE is:

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.

The bug was discovered 05/16/2018. The weakness was published 05/17/2018 with Cisco as cisco-sa-20180516-iseeap as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2018-0277 since 11/27/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 110566 (Cisco Identity Services Engine DoS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l.

Proper firewalling of is able to address this issue. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (110566) and SecurityFocus (BID 104212†). Similar entry is available at VDB-117838. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.9

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 110566
Nessus Name: Cisco Identity Services Engine DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

Timelineinfo

11/27/2017 🔍
05/16/2018 +169 days 🔍
05/16/2018 +0 days 🔍
05/16/2018 +0 days 🔍
05/16/2018 +0 days 🔍
05/17/2018 +1 days 🔍
05/17/2018 +0 days 🔍
06/15/2018 +29 days 🔍
03/13/2023 +1732 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20180516-iseeap
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0277 (🔍)
GCVE (CVE): GCVE-0-2018-0277
GCVE (VulDB): GCVE-100-117835
SecurityFocus: 104212 - Cisco Identity Services Engine CVE-2018-0277 Denial of Service Vulnerability
SecurityTracker: 1040922

See also: 🔍

Entryinfo

Created: 05/17/2018 12:35
Updated: 03/13/2023 16:40
Changes: 05/17/2018 12:35 (68), 02/06/2020 09:51 (6), 03/13/2023 16:40 (4)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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