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AUSCERT External Security Bulletin Redistribution
ESB-2017.1950
Cisco Firepower System Software Secure Sockets Layer Policy
Bypass Vulnerability
8 August 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower System Software
Publisher: Cisco Systems
Operating System: Cisco
VMware ESX Server
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6766
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-fpw
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Cisco Firepower System Software Secure Sockets Layer Policy Bypass Vulnerability
Medium
Advisory ID: cisco-sa-20170802-fpw
First Published: 2017 August 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve12652
CVSS Score: Base 5.3, Temporal 5.3
CVE-2017-6766
CWE-310
Summary
A vulnerability in the Secure Sockets Layer (SSL) Decryption and Inspection
feature of Cisco Firepower System Software could allow an unauthenticated,
remote attacker to bypass the SSL policy for decrypting and inspecting
traffic on an affected system.
The vulnerability is due to unexpected interaction with Known Key and Decrypt
and Resign configuration settings of SSL policies when the affected software
receives unexpected SSL packet headers. An attacker could exploit this
vulnerability by sending a crafted SSL packet through an affected device
in a valid SSL session. A successful exploit could allow the attacker to
bypass the SSL decryption and inspection policy for the affected system,
which could allow traffic to flow through the system without being inspected.
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-20170802-fpw
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.
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 internal security testing.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-fpw
Revision History
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-August-02
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.
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