Cisco Security Advisory
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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
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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
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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.
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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.
If the following output appears in the syncd.log file, URL filtering could be disabled for the device:# grep -i "no license" ./dir-archives/var-log/syncd.log
Syncd.pl[4444]: Disable URL Filtering - no Licenses at /usr/local/sf/lib/perl/5.10.1/SF/Cloud/Support.pm line 1209
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As a temporary workaround, administrators can enable URL filtering for a device again by doing the following in the GUI of the software:
- Choose System > Integration.
- Click the Cisco CSI tab.
- Select the Enable URL Filtering checkbox.
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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.
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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.
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This vulnerability was found during the resolution of a Cisco TAC support case.
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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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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2017-May-24
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