high
7.8
CWE
20
Advisory Published
Updated

CVE-2018-0295: Input Validation

First published: Wed Jun 20 2018(Updated: )

A vulnerability in the Border Gateway Protocol (BGP) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the device unexpectedly reloading. The vulnerability is due to incomplete input validation of the BGP update messages. An attacker could exploit this vulnerability by sending a crafted BGP update message to the targeted device. An exploit could allow the attacker to cause the switch to reload unexpectedly. The Cisco implementation of the BGP protocol only accepts incoming BGP traffic from explicitly defined peers. To exploit this vulnerability, an attacker must be able to send the malicious packets over a TCP connection that appears to come from a trusted BGP peer or inject malformed messages into the victim's BGP network. This would require obtaining information about the BGP peers in the affected system's trusted network. The vulnerability may be triggered when the router receives a malformed BGP message from a peer on an existing BGP session. At least one BGP neighbor session must be established for a router to be vulnerable. This vulnerability affects Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 3600 Platform Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules. Cisco Bug IDs: CSCve79599, CSCve87784, CSCve91371, CSCve91387.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS>=6.0<7.3\(3\)n1\(1\)
Cisco Nexus 5000 firmware
Cisco Nexus 5010
Cisco Nexus 5020
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5696Q Firmware
Cisco NX-OS>=6.2<8.1\(2\)
Cisco Nexus 7000
Cisco Nexus 7700 series
Cisco NX-OS<7.0\(3\)i3
Cisco NX-OS>=7.0\(3\)i4<7.0\(3\)i7\(1\)
Cisco Nexus 92160YC Switch
Cisco Nexus 92304QC Switch
Cisco Nexus 9236C Switch
Cisco Nexus 9272Q Switch
Cisco Nexus
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128 Firmware
Cisco Nexus 93180YC-EX-24
Cisco Nexus 9332PQ Firmware
Cisco Nexus 9372PX-E
Cisco Nexus 9372TX
Cisco Nexus 9396PX Firmware
Cisco Nexus 9396TX Firmware
Cisco Nexus 9504 firmware
Cisco Nexus 9508
Cisco Nexus 9516 firmware
Cisco Nexus 9508
Cisco x9636q-r
Cisco Nexus X9636Q-R
Cisco NX-OS<7.0\(3\)i4
Cisco NX-OS>=7.0\(3\)i5<7.0\(3\)i6\(2\)
Cisco NX-OS=7.0\(3\)i7
Cisco Nexus 172tq-xl
Cisco Nexus 3016Q Firmware
Cisco Nexus 3048 Firmware
Cisco Nexus 3064
Cisco Nexus 3064
Cisco Nexus 3064x
Cisco Nexus 3100V Firmware
Cisco Nexus 31128PQ
Cisco Nexus 3132C-Z Firmware
Cisco Nexus 3132Q-XL
Cisco Nexus 3132Q-X/3132Q-XL
Cisco Nexus 3132Q-XL Firmware
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172PQ/PQ-XL
Cisco Nexus 3172PQ-XL Firmware
Cisco Nexus 3172TQ Firmware
Cisco Nexus 3172TQ-XL
Cisco Nexus 3232C
Cisco Nexus 3264C-E Firmware
Cisco Nexus 3264Q Firmware
Cisco Nexus 34180YC Firmware
Cisco Nexus 3524-xl
Cisco Nexus 3524-XL Firmware
Cisco Nexus 3548-X/XL Firmware
Cisco Nexus 3548-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 3636C-R Firmware
Cisco Nexus 36180YC-R
Cisco Nexus 6001P Firmware
Cisco Nexus 6001T Firmware
Cisco NX-OS=7.0
Cisco Nexus 9500 Series

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2018-0295?

    The severity of CVE-2018-0295 is high due to the potential for denial of service attacks that can lead to unexpected device reloads.

  • How do I fix CVE-2018-0295?

    To fix CVE-2018-0295, Cisco recommends updating to the latest version of NX-OS that addresses the vulnerability.

  • What devices are affected by CVE-2018-0295?

    CVE-2018-0295 affects various versions of Cisco NX-OS running on multiple Cisco Nexus switches.

  • What kind of attacks can CVE-2018-0295 facilitate?

    CVE-2018-0295 can facilitate denial of service (DoS) attacks, causing devices to unexpectedly restart.

  • Is CVE-2018-0295 exploitable remotely?

    Yes, CVE-2018-0295 is exploitable by unauthenticated remote attackers.

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