Executive Summary

Summary
Title Cisco Web Security Appliance Range Request Denial of Service Vulnerability
Informations
Name cisco-sa-20151104-wsa2 First vendor Publication 2015-11-04
Vendor Cisco Last vendor Modification 2015-11-04
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:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A vulnerability in the file-range request functionality of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an appliance because the appliance runs out of system memory.

The vulnerability is due to a failure to free memory when a file range is requested through the Cisco WSA. An attacker could exploit this vulnerability by opening multiple connections that request file ranges through the WSA. A successful exploit could allow the attacker to cause the WSA to stop passing traffic when enough memory is used and not freed.

Cisco has released software updates that address this vulnerability. A workaround that mitigates this vulnerability is also available.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-wsa2

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Original Source

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

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-399 Resource Management Errors

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 10

Snort® IPS/IDS

Date Description
2016-03-14 Cisco Web Security Appliance range request memory leak denial of service attempt
RuleID : 36649 - Revision : 1 - Type : SERVER-OTHER

Nessus® Vulnerability Scanner

Date Description
2015-11-18 Name : The remote security appliance is missing a vendor-supplied patch.
File : cisco-sa-20151104-aos_wsa.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
2
Date Informations
2015-11-19 13:25:09
  • Multiple Updates
2015-11-06 21:27:34
  • Multiple Updates
2015-11-04 21:17:49
  • First insertion