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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA TLS Buffer Underflow Lets Remote Users Cause the Target System to Reload
SecurityTracker Alert ID:  1040725
SecurityTracker URL:  http://securitytracker.com/id/1040725
CVE Reference:   CVE-2018-0231   (Links to External Site)
Date:  Apr 19 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.2 and after
Description:   A vulnerability was reported in Cisco ASA. A remote user can cause the target system to reload.

A remote user can send a specially crafted Transport Layer Security (TLS) message to an interface on the target device that has SSL enabled to trigger a buffer underflow in the TLS library and cause the target device to reload.

Cisco Adaptive Security Virtual Appliance (ASAv) is affected.

The vendor has assigned bug IDs CSCve18902, CSCve34335, and CSCve38446 to this vulnerability.

Impact:   A remote user can cause the target system to reload.
Solution:   The vendor has issued a fix (9.2.4.27, 9.4.4.13, 9.6.3.20, 9.7.1.16, 9.8.2.14).

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3 (Links to External Site)
Cause:   Boundary error, Input validation error

Message History:   None.


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