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AUSCERT External Security Bulletin Redistribution
ESB-2017.1346
Cisco Firepower System Software URL Filtering Bypass Vulnerability
29 May 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6674
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170524-fmc
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Cisco Security Advisory
Cisco Firepower System Software URL Filtering Bypass Vulnerability
Medium
Advisory ID:
cisco-sa-20170524-fmc
First Published:
2017 May 24 21:30 GMT
Version 1.0:
Final
Workarounds:
Yes
Cisco Bug IDs:
CSCvb16413
CVE-2017-6674
CWE-20
CVSS Score:
Base 5.9, Temporal 5.9
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
CVE-2017-6674
CWE-20
Summary
A vulnerability in the feature-license management functionality of
Cisco Firepower System Software could allow an unauthenticated, remote
attacker to bypass URL filters that have been configured for an affected
device.
The vulnerability exists because the URL Filtering license for the affected
software could be disabled unexpectedly, which could disable the URL
filtering functionality of the affected software. An attacker could exploit
this vulnerability by sending traffic, which should have matched a
configured URL filter, through an affected device. A successful exploit
could allow the attacker to bypass URL filters that were configured for the
affected device.
There is a workaround that addresses this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170524-fmc
Affected Products
Vulnerable Products
This vulnerability affects Cisco Firepower System Software. For information
about affected software releases, consult the Cisco bug ID(s) at the top of
this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Indicators of Compromise
If URL filtering unexpectedly stops working on an affected device,
administrators can issue the following command in the CLI or the Firepower
Management Center (FMC) console.
# grep -i "no license" ./dir-archives/var-log/syncd.log
If the following output appears in the syncd.log file, URL filtering could
be disabled for the device:
Syncd.pl[4444]: Disable URL Filtering - no Licenses at /usr/local/sf/lib/perl/5.10.1/SF/Cloud/Support.pm line 1209
Workarounds
As a temporary workaround, administrators can enable URL filtering for a
device again by doing the following in the GUI of the software:
1. Choose System > Integration.
2. Click the Cisco CSI tab.
3. Select the Enable URL Filtering checkbox.
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.
Cisco Security Vulnerability Policy
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.
Subscribe to Cisco Security Notifications
Subscribe
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20170524-fmc
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-May-24
Legal Disclaimer
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.
Cisco Security Vulnerability Policy
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.
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