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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Input Validation Flaw in WebVPN Management Interface Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1040713
SecurityTracker URL:  http://securitytracker.com/id/1040713
CVE Reference:   CVE-2018-0242   (Links to External Site)
Date:  Apr 19 2018
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco ASA. A remote user can conduct cross-site scripting attacks.

The WebVPN web-based management interface does not properly filter HTML code from user-supplied input before displaying the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the WebVPN web-based management interface and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

The vendor has assigned bug ID CSCvg33985 to this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the WebVPN web-based management interface, access data recently submitted by the target user via web form to the interface, or take actions on the interface acting as the target user.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn (Links to External Site)
Cause:   Input validation error

Message History:   None.


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