Cisco Security Advisory
Cisco FirePOWER Malware Protection Bypass Vulnerability
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AV:N/AC:M/Au:N/C:P/I:N/A:N/E:F/RL:U/RC:C
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A vulnerability in TCP processing in Cisco FirePOWER system software could allow an unauthenticated, remote attacker to download files that would normally be blocked.
The vulnerability is due to out-of-order TCP segments (retransmissions out of the current window, which have already been acknowledged) not being properly processed before being passed to HTTP inspection, which for GZIP compressed streams causes GZIP decompression to fail. This results in an incorrect SHA-256 hash being calculated and potential malware not being detected. An attacker could exploit this vulnerability by tricking a user into downloading a file containing malware via HTTP from a specifically prepared server. An exploit could allow the attacker to bypass the malware protection provided by the FirePOWER system software.
Workarounds that address this vulnerability are not available.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-fpwr
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Vulnerable Products
The following Cisco products are vulnerable:
- Adaptive Security Appliance (ASA) 5500-X Series with FirePOWER Services
- Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances
- Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances
- FirePOWER 7000 Series Appliances
- FirePOWER 8000 Series Appliances
- FirePOWER Threat Defense for Integrated Services Routers (ISRs)
- Next Generation Intrusion Prevention System (NGIPS) for Blue Coat X-Series
- Sourcefire 3D System Appliances
- Virtual Next-Generation Intrusion Prevention System (NGIPSv) for VMware
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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There are no workarounds that address this vulnerability.
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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 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 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 2016-November-28
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