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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Clientless SSL VPN Heap Overflow Lets Remote Authenticated Users Execute Arbitrary Code
SecurityTracker Alert ID:  1037797
SecurityTracker URL:  http://securitytracker.com/id/1037797
CVE Reference:   CVE-2017-3807   (Links to External Site)
Date:  Feb 8 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco ASA Clientless SSL VPN. A remote authenticated user can execute arbitrary code on the target system.

A remote authenticated user can send a specially crafted URL to the target system to trigger a heap overflow in the Clientless SSL VPN function in the Common Internet Filesystem (CIFS) code to execute arbitrary code on the target system.

Systems configured in routed firewall mode and in single or multiple context mode are affected.

The vendor has assigned bug ID CSCvc23838 to this vulnerability.

Oliver Chang from Google Project Zero reported this vulnerability.

Impact:   A remote authenticated user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fix (9.1(7.13), 9.4(4), 9.6(2.10)).

The vendor plans to issue a fix for 9.2 and 9.5 in April 2017.

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170208-asa

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170208-asa (Links to External Site)
Cause:   Boundary error, Input validation error

Message History:   None.


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