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Cisco Bug: CSCvh77456 - Cisco Firepower Threat Defense Software FTP Inspection Denial of Service Vulnerability

Last Modified

Sep 19, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

101.5(1.10) 101.5(1.34) 99.2(0.25)

Description (partial)

Symptom:
A vulnerability in the FTP inspection engine of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.

The vulnerability exists because the affected software fails to release spinlocks when a device is running low on system memory, if the software is configured to apply FTP inspection and an access control rule to transit traffic, and the access control rule is associated with an FTP file policy. An attacker could exploit this vulnerability by sending a high rate of transit traffic through an affected device to cause a low-memory condition on the device. A successful exploit could allow the attacker to cause a software panic on the affected device, which could cause the device to reload and result in a temporary DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-ftd-inspect-dos

Conditions:
Please refer to the Security Advisory
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