high
8.6
CWE
770
Advisory Published
Updated

CVE-2017-3883

First published: Thu Oct 19 2017(Updated: )

A vulnerability in the authentication, authorization, and accounting (AAA) implementation of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability occurs because AAA processes prevent the NX-OS System Manager from receiving keepalive messages when an affected device receives a high rate of login attempts, such as in a brute-force login attack. System memory can run low on the FXOS devices under the same conditions, which could cause the AAA process to unexpectedly restart or cause the device to reload. An attacker could exploit this vulnerability by performing a brute-force login attack against a device that is configured with AAA security services. A successful exploit could allow the attacker to cause the affected device to reload. This vulnerability affects the following Cisco products if they are running Cisco FXOS or NX-OS System Software that is configured for AAA services: Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, Multilayer Director Switches, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System (UCS) 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCuq58760, CSCuq71257, CSCur97432, CSCus05214, CSCux54898, CSCvc33141, CSCvd36971, CSCve03660.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Firepower Extensible Operating System<=2.3
Cisco Firepower 4100 Series
Cisco FX-OS=2.3
Cisco Firepower 9300 firmware
Cisco NX-OS=5.2
Cisco NX-OS=6.2
Cisco NX-OS=6.3
Cisco NX-OS=7.3
Cisco NX-OS=8.1
Cisco NX-OS=8.2
Cisco MDS 9000 Series Multilayer Switches
Cisco NX-OS<=4.1
Cisco Nexus 1000V for Hyper-V
Cisco Nexus 1100v
Cisco NX-OS<=6.0
Cisco NX-OS=7.0
Cisco Nexus 3000
Cisco Nexus 3016Q Firmware
Cisco Nexus 3016Q Firmware
Cisco Nexus 3048 Firmware
Cisco Nexus 3064 Firmware
Cisco Nexus 3064
Cisco Nexus 3064-X Firmware
Cisco NX-OS=7.0\(3\)i3\(1\)
Cisco Nexus 3500 Platform
Cisco Nexus 3524-xl
Cisco Nexus 3548-X/XL Firmware
Cisco NX-OS<=5.2
Cisco Nexus 2000
Cisco Nexus 5000 firmware
Cisco Nexus 5010
Cisco Nexus 5010
Cisco NX-OS for Nexus 5500 Platform Switches
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco Nexus 5600 Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5696Q Firmware
Cisco Nexus 6000 firmware
Cisco Nexus 6001 Firmware
Cisco Nexus 6004 Firmware
Cisco Nexus 6004X Firmware
Cisco NX-OS=7.1\(0.1\)
Cisco Nexus 7000
Cisco Nexus 7000
Cisco Nexus 7000
Cisco Nexus 7000 9-Slot Firmware
Cisco Nexus 7700 series
Cisco NX-OS=6.1
Cisco Nexus 9000 Firmware
Cisco Catalyst 9500 Series Switches
Cisco NX-OS<=2.2
Cisco NX-OS=2.5
Cisco NX-OS=3.0
Cisco NX-OS=3.1
Cisco NX-OS=3.2
Cisco UCS 6100
Cisco UCS 6200 firmware
Cisco UCS 6300 firmware

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2017-3883?

    CVE-2017-3883 has been classified as a medium severity vulnerability.

  • How do I fix CVE-2017-3883?

    To remediate CVE-2017-3883, update your Cisco Firepower Extensible Operating System or NX-OS to the latest patched version.

  • Who is affected by CVE-2017-3883?

    CVE-2017-3883 affects devices running Cisco Firepower Extensible Operating System versions up to 2.3 and various versions of Cisco NX-OS.

  • What kind of attack does CVE-2017-3883 facilitate?

    CVE-2017-3883 allows an unauthenticated remote attacker to trigger a device reload through malicious requests.

  • Is CVE-2017-3883 exploitable over the Internet?

    Yes, CVE-2017-3883 can potentially be exploited by an attacker over the Internet due to the nature of the vulnerability.

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