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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0530 Cisco Firepower 9000 Series Firepower 2-Port 100G Double-Width Network Module Queue Wedge Denial of Service Vulnerability 21 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Firepower 9000 Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-1700 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-firpwr-dos - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Firepower 9000 Series Firepower 2-Port 100G Double-Width Network Module Queue Wedge Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20190220-firpwr-dos First Published: 2019 February 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvn57812 CVE-2019-1700 CWE-399 CVSS Score: 6.1 AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190220-firpwr-dos Affected Products o 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 Indicators of Compromise o 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. 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 The device may need to be rebooted to clear this condition. Contact the Cisco Technical Assistance Center (TAC) for further assistance. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o 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. Exploitation and Public Announcements o 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 o This vulnerability was found during the resolution of a Cisco TAC support case. Cisco Security Vulnerability Policy o 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 o Subscribe URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190220-firpwr-dos Revision History o +----------+--------------------------+----------+--------+-------------------+ | Version | Description | Section | Status | Date | +----------+--------------------------+----------+--------+-------------------+ | 1.0 | Initial public release. | -- | Final | 2019-February-20 | +----------+--------------------------+----------+--------+-------------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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