Executive Summary

Title Cisco ASA Clientless SSL VPN CIFS Heap Overflow Vulnerability
Name cisco-sa-20170208-asa First vendor Publication 2017-02-08
Vendor Cisco Last vendor Modification 2017-02-08
Severity (Vendor) N/A Revision 1.0

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:P/I:P/A:C)
Cvss Base Score 8 Attack Range Network
Cvss Impact Score 8.5 Attack Complexity Low
Cvss Expoit Score 8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores


A vulnerability in Common Internet Filesystem (CIFS) code in the Clientless SSL VPN functionality of Cisco ASA Software could allow an authenticated, remote attacker to cause a heap overflow.

The vulnerability is due to insufficient validation of user supplied input. An attacker could exploit this vulnerability by sending a crafted URL to the affected system. An exploit could allow the remote attacker to cause a reload of the affected system or potentially execute code.

Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed firewall mode only and in single or multiple context mode. This vulnerability can be triggered by IPv4 or IPv6 traffic. A valid TCP connection is needed to perform the attack. The attacker needs to have valid credentials to log in to the Clientless SSL VPN portal.

Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170208-asa


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration

Application 324

Snort® IPS/IDS

Date Description
2017-02-10 Cisco ASA WebVPN memory corruption attempt
RuleID : 41538 - Revision : 2 - Type : SERVER-WEBAPP

Nessus® Vulnerability Scanner

Date Description
2017-02-16 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20170208-asa.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2017-02-28 00:24:53
  • Multiple Updates
2017-02-18 13:26:13
  • Multiple Updates
2017-02-08 21:23:46
  • First insertion