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AUSCERT External Security Bulletin Redistribution
ESB-2018.1206.3
Cisco Firepower Detection Engine Secure Sockets Layer Denial
of Service Vulnerability
19 May 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower Detection Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0233
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort
Revision History: May 19 2020: Vendor issued minor update to reflect associated Cisco bug ID
November 20 2019: Updated internal metadata release information.
April 19 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Firepower Detection Engine Secure Sockets Layer Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-20180418-fpsnort
First Published: 2018 April 18 16:00 GMT
Last Updated: 2020 May 18 15:38 GMT
Version 1.2: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCve23031
CVE-2018-0233
CWE-400
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Secure Sockets Layer (SSL) packet reassembly
functionality of the detection engine in Cisco Firepower System Software
could allow an unauthenticated, remote attacker to cause the detection
engine to consume excessive system memory on an affected device, which
could cause a denial of service (DoS) condition.
The vulnerability is due to the affected software improperly handling
changes to SSL connection states. An attacker could exploit this
vulnerability by sending crafted SSL connections through an affected
device. A successful exploit could allow the attacker to cause the
detection engine to consume excessive system memory on the affected device,
which could cause a DoS condition. The device may need to be reloaded
manually to recover from this 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-20180418-fpsnort
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Firepower System Software Releases 6.0.0
and later, if the software is configured as described in this section and
the software is running on any of the following Cisco products:
Adaptive Security Appliance (ASA) 5500-X Series Firewalls with
FirePOWER Services
Adaptive Security Appliance (ASA) 5500-X Series Next-Generation
Firewalls
Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances
Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances
Firepower 4100 Series Appliances
FirePOWER 7000 Series Appliances
FirePOWER 8000 Series Appliances
Firepower 9300 Series Security Appliances
Firepower Threat Defense for Integrated Services Routers (ISRs)
Firepower Threat Defense Virtual for VMware
Industrial Security Appliance 3000
Sourcefire 3D System Appliances
A device is vulnerable if the software is configured to pass encrypted
traffic that matches an SSL policy rule or has a default rule action of Do
not decrypt .
Determining the Cisco Firepower System Software Release
To determine which Cisco Firepower System Software release is running on a
device, administrators can log in to the device and use the show version
command in the CLI. The following example shows the output of the command
for a device that is running Release 6.2.0:
> show version
---------------------[ ftd ]---------------------
Model : Cisco ASA5525-X Threat Defense (75) Version 6.2.0 (Build 362)
UUID : 2849ba3c-ecb8-11e6-98ca-b9fc2975893c
Rules update version : 2017-03-15-001-vrt
VDB version : 279
----------------------------------------------------
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Adaptive Security Appliance (ASA) Software
Firepower Management Center
Intrusion Prevention System (IPS) Software
Meraki MX Security Appliances
Next-Generation Intrusion Prevention System (NGIPSv) for VMware
Snort IPS for Integrated Services Routers (ISRs)
Details
o This vulnerability could cause the Snort process to exhaust system memory
on an affected device and restart. While the Snort process is restarting,
threat detection could be bypassed, inspection of all network traffic could
fail, or network traffic could be prevented from passing through the
device, depending on the platform and device configuration.
On Cisco FirePOWER platforms:
Passive and bypass interfaces will bypass inspection and traffic will
pass through the device.
Routed, switched, and nonbypass interfaces will drop the traffic;
traffic will not pass through the device.
Cisco Firepower Threat Defense (FTD) Software will drop the traffic;
traffic will not pass through the device.
On Cisco ASA 5500-X Series Firewalls with FirePOWER Services, traffic will
bypass threat detection and will not be dropped, if the sfr fail-open CLI
command is supported and configured on the ASA.
Indicators of Compromise
o Exploitation of this vulnerability could cause the following error message
to appear in the /var/log/messages system log file for an affected device:
Firepower-module2 kernel: [109568.659049] snort invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0
Contact the Cisco Technical Assistance Center (TAC) if additional
assistance is required to determine whether the device has been compromised
by this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table in this section. To help ensure a complete upgrade solution, consider
that this advisory is part of a collection that includes the following
advisories:
cisco-sa-20180418-fp2100 : Cisco Firepower 2100 Series Security
Appliances IP Fragmentation Denial of Service Vulnerability
cisco-sa-20180418-fpsnort : Cisco Firepower Detection Engine Secure
Sockets Layer Denial of Service Vulnerability
In the following table, the left column lists releases of Cisco software.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by all the vulnerabilities described in this
collection of advisories and which release includes fixes for those
vulnerabilities.
+---------------+-------------------+-------------------------------------+
| Cisco | First Fixed | First Fixed Release for All |
| Firepower | Release for This | Vulnerabilities Described in the |
| System | Vulnerability | Collection of Advisories |
| Software | | |
+---------------+-------------------+-------------------------------------+
| 6.0 | 6.1.0.6 | 6.1.0.6 |
+---------------+-------------------+-------------------------------------+
| 6.0.1 | 6.1.0.6 | 6.1.0.6 |
+---------------+-------------------+-------------------------------------+
| 6.1.0 | 6.1.0.6 or later | 6.1.0.6 |
+---------------+-------------------+-------------------------------------+
| 6.2.0 | 6.2.0.3 or later | 6.2.0.5 |
+---------------+-------------------+-------------------------------------+
| 6.2.1 | Not vulnerable | 6.2.2.1 |
+---------------+-------------------+-------------------------------------+
| 6.2.2 | Not vulnerable | 6.2.2.1 |
+---------------+-------------------+-------------------------------------+
| 6.2.3 | Not vulnerable | 6.2.3 |
+---------------+-------------------+-------------------------------------+
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.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180418-fpsnort
Revision History
o +---------+-------------------------+---------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+---------+--------+------------------+
| 1.2 | Added the Cisco bug | | Final | 2020-May-18 |
| | identifier CSCve23031. | | | |
+---------+-------------------------+---------+--------+------------------+
| | Updated internal | | | |
| 1.1 | metadata release | - | Final | 2019-November-19 |
| | information. | | | |
+---------+-------------------------+---------+--------+------------------+
| 1.0 | Initial public release. | - | Final | 2018-April-18 |
+---------+-------------------------+---------+--------+------------------+
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