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CVE-2018-0247: A vulnerability in Web Authentication (WebAuth) clients for the Cisco Wireless LAN Controller (WLC) and Air...

A vulnerability in Web Authentication (WebAuth) clients for the Cisco Wireless LAN Controller (WLC) and Aironet Access Points running Cisco IOS Software could allow an unauthenticated, adjacent attacker to bypass authentication and pass traffic. The vulnerability is due to incorrect implementation of authentication for WebAuth clients in a specific configuration. An attacker could exploit this vulnerability by sending traffic to local network resources without having gone through authentication. A successful exploit could allow the attacker to bypass authentication and pass traffic. This affects Cisco Aironet Access Points running Cisco IOS Software and Cisco Wireless LAN Controller (WLC) releases prior to 8.5.110.0 for the following specific WLC configuration only: (1) The Access Point (AP) is configured in FlexConnect Mode with NAT. (2) The WLAN is configured for central switching, meaning the client is being assigned a unique IP address. (3) The AP is configured with a Split Tunnel access control list (ACL) for access to local network resources, meaning the AP is doing the NAT on the connection. (4) The client is using WebAuth. This vulnerability does not apply to .1x clients in the same configuration. Cisco Bug IDs: CSCvc79502, CSCvf71789.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This flaw can let someone already near the wireless network bypass WebAuth and send traffic to local network resources. It only applies to a narrow Cisco WLC and Aironet configuration, but affected sites could lose intended guest or client access control. Exposure is limited to Cisco Wireless LAN Controller releases before 8.5.110.0 and Aironet APs running Cisco IOS Software in the specific configuration described by Cisco. Organizations not using FlexConnect Mode with NAT, central switching, Split Tunnel ACLs, and WebAuth clients are not indicated as affected. Prioritize if guest or contractor wireless networks rely on Cisco WebAuth to separate unauthenticated users from local resources. The narrow configuration lowers broad urgency, but affected environments should remediate promptly because the control bypasses authentication. Mitigation focus: Inventory Cisco WLC and Aironet deployments using WebAuth.; Check for FlexConnect Mode with NAT and Split Tunnel ACLs.; Upgrade affected WLC releases to 8.5.110.0 or later per Cisco guidance..

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CWE-287: Credential and account abuse lookup

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CVE-2018-0247 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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2Source links

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Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aCisco Wireless LAN Controller and Aironet Access PointsCisco Wireless LAN Controller and Aironet Access PointsListed
Weakness

CWE details

CWE-287

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CWE-287 · source CWE mapping

Improper Authentication

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