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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Input Validation Flaw in Clientless SSL VPN Portal Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1040714
SecurityTracker URL:  http://securitytracker.com/id/1040714
CVE Reference:   CVE-2018-0251   (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 'Web Server Authentication Required' screen of the Clientless Secure Sockets Layer (SSL) VPN portal 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 Cisco ASA Clientless SSL VPN portal 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 following models are affected:

ASA 5500 Series
ASA 5500-X Series
ASA Services Module for Cisco Catalyst 6500 Series
ASA Services Module for Cisco 7600 Series
Adaptive Security Virtual Appliance (ASAv)

The vendor has assigned bug ID CSCvh20742 to this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the Cisco ASA Clientless SSL VPN portal, 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-asawvpn2

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn2 (Links to External Site)
Cause:   Input validation error

Message History:   None.


 Source Message Contents



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