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Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability

Summary

A vulnerability in the web-based management interface of Cisco AsyncOS for Cisco Email Security Appliance (ESA), Cisco Web Security Appliance (WSA), and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition.

Credit:

The information has been provided by Vendor

The original article can be found at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cont-sec-gui-dos-nJ625dXb

Details

The vulnerability is due to improper validation of specific HTTP request headers. An attacker could exploit this vulnerability by sending a malformed HTTP request to an affected device. A successful exploit could allow the attacker to trigger a prolonged status of high CPU utilization relative to the GUI process(es). Upon successful exploitation of this vulnerability, an affected device will still be operative, but its response time and overall performance may be degraded.

Vulnerable Systems:

  • Cisco ESA and Cisco Cloud Email Security Release 13.0.0-392 and earlier
  • Cisco WSA Release 12.0.1-268 and earlier
  • Cisco SMA releases earlier than 13.6.0

CVE Information:

CVE-2020-3164

Disclosure Timeline:
Published Date:03/04/2020

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