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AUSCERT External Security Bulletin Redistribution
Cisco Firepower Management Center Disk Utilization Denial of
11 January 2019
AusCERT Security Bulletin Summary
Product: Cisco Firepower Management Center
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-15458
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Cisco Firepower Management Center Disk Utilization Denial of Service
Advisory ID: cisco-sa-20190109-fpwr-mc-dos
First Published: 2019 January 9 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvk20751
CVSS Score: Base 5.3
o A vulnerability in the Shell Access Filter feature of Cisco Firepower
Management Center (FMC), when used in conjunction with remote
authentication, could allow an unauthenticated, remote attacker to cause
high disk utilization, resulting in a denial of service (DoS) condition.
The vulnerability occurs because the configuration of the Shell Access
Filter, when used with a specific type of remote authentication, can cause
a system file to have unbounded writes. An attacker could exploit this
vulnerability by sending a steady stream of remote authentication requests
to the appliance when the specific configuration is applied. Successful
exploitation could allow the attacker to increase the size of a system log
file so that it consumes most of the disk space. The lack of available disk
space could lead to a DoS condition in which the device functions could
operate abnormally, making the device unstable.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects Cisco Firepower Management Center (FMC). For
information about affected software releases, consult the Cisco bug ID(s)
at the top of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o There are no workarounds that address this vulnerability.
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | -- | Final | 2019-January-09 |
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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