Cisco Security Advisory
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CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in field-programmable gate array (FPGA) ingress buffer management for the Cisco Firepower 9000 Series with the Cisco Firepower 2-port 100G double-width network module (PID: FPR9K-DNM-2X100G) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. Manual intervention may be required before a device will resume normal operations.
The vulnerability is due to a logic error in the FPGA related to the processing of different types of input packets. An attacker could exploit this vulnerability by being on the adjacent subnet and sending a crafted sequence of input packets to a specific interface on an affected device. A successful exploit could allow the attacker to cause a queue wedge condition on the interface. When a wedge occurs, the affected device will stop processing any additional packets that are received on the wedged interface.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-firpwr-dos
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Vulnerable Products
This vulnerability is specific to the Cisco Firepower 9000 Series with the Cisco Firepower 2-port 100G double-width network module installed, which is PID FPR9K-DNM-2X100G. The fix for this vulnerability is not an FXOS Software upgrade; it is an FPGA firmware upgrade.Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
- Firepower 2100 Series
- Firepower 4100 Series
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On devices where this vulnerability is exploited, the input discard or overrrun interface counters will increase exponentially. The administrator can check for this condition by using the show interface command at the CLI. When one or both of these counters increment, this is an indication that no traffic is being processed on the interface.
The device may need to be rebooted to clear this condition. Contact the Cisco Technical Assistance Center (TAC) for further assistance.Fp9000(fxos)# show interface eth2/1 Ethernet2/1 is up Dedicated Interface Hardware: 100000 Ethernet, address: 70db.9819.a7b4 (bia 70db.9819.a7b4) Description: U: Uplink . . . RX 0 unicast packets 425 multicast packets 0 broadcast packets 425 input packets 57370 bytes 0 jumbo packets 0 storm suppression bytes 0 runts 0 giants 0 CRC 0 no buffer 0 input error 0 short frame 0 overrun 0 underrun 0 ignored 0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop 0 input with dribble 425 input discard 0 Rx pause
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There are no workarounds that address this vulnerability.
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This vulnerability is fixed by an upgrade to the FPGA firmware. Customers are advised to follow the procedure outlined in the Firmware Upgrade section of the Cisco Firepower 4100/9300 FXOS CLI Configuration Guide.
This procedure works for FXOS Software Releases 2.2.2 or later. A customer on an earlier release should upgrade to Software Release 2.2.2 (or later) or contact the Cisco TAC for assistance.
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 2019-February-20
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