Vulnerability Name:

CVE-2018-0247 (CCN-142694)

Assigned:2017-11-27
Published:2018-05-02
Updated:2019-10-09
Summary: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.
CVSS v3 Severity:4.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
4.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
4.7 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
4.1 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:3.3 Low (CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
3.3 Low (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2018-0247

Source: BID
Type: Third Party Advisory, VDB Entry
104087

Source: CCN
Type: BID-104087
Multiple Cisco Products CVE-2018-0247 Authentication Bypass Vulnerability

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1040814

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1040815

Source: XF
Type: UNKNOWN
cisco-cve20180247-sec-bypass(142694)

Source: CCN
Type: Cisco Security Advisory cisco-sa-20180502-aironet-auth
Cisco Wireless LAN Controller and Aironet Access Points IOS WebAuth Client Authentication Bypass Vulnerability

Source: CONFIRM
Type: Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-aironet-auth

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:wireless_lan_controller_software:8.3(104.105):*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:cisco:aironet_access_point_software:8.3(104.105):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:aironet_access_point_software:8.5(107.52):*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/h:cisco:aironet_access_points:*:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:ios_software:*:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:wireless_lan_controller:8.3.102.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco wireless lan controller software 8.3(104.105)
    cisco aironet access point software 8.3(104.105)
    cisco aironet access point software 8.5(107.52)
    cisco aironet access points *
    cisco ios software *
    cisco wireless lan controller 8.3.102.0