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AUSCERT External Security Bulletin Redistribution
ESB-2018.3494
Cisco Firepower System Software receives security update
8 November 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-15443
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181107-fde-tcp-bypass
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Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20181107-fde-tcp-bypass
First Published: 2018 November 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvk76547
CVE-2018-15443
CVSS Score:
Base 5.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
*
A vulnerability in the detection engine of Cisco Firepower System Software
could allow an unauthenticated, remote attacker to bypass a configured
Intrusion Prevention System (IPS) rule that inspects certain types of TCP
traffic.
The vulnerability is due to incorrect TCP retransmission handling. An
attacker could exploit this vulnerability by sending a crafted TCP
connection request through an affected device. A successful exploit could
allow the attacker to bypass configured IPS rules and allow uninspected
traffic onto the network.
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-20181107-fde-tcp-bypass
Affected Products
* Vulnerable Products
This vulnerability affects Cisco Firepower System Software releases before
the first fixed release where the device is configured with an IPS rule for
TCP traffic inspection.
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.
Workarounds
* There are no workarounds that address this vulnerability.
Fixed Software
* 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
providers.
Exploitation and Public Announcements
* 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.
Source
* This vulnerability was found during the resolution of a Cisco TAC support
case.
URL
* https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20181107-fde-tcp-bypass
Revision History
*
+----------------------------------------------------------------------------+
| Version | Description | Section | Status | Date |
|---------+---------------------------+---------+--------+-------------------|
| 1.0 | Initial public release. | - | Final | 2018-November-07 |
+----------------------------------------------------------------------------+
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