ESB-2018.1810 - ALERT [Cisco] Cisco NX-OS: Multiple vulnerabilities 2018-06-21

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1810
          Cisco NX-OS Software Role-Based Access Control Elevated
                         Privileges Vulnerability
                               21 June 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco NX-OS
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Root Compromise      -- Remote/Unauthenticated
                   Increased Privileges -- Existing Account      
                   Denial of Service    -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0337 CVE-2018-0330 CVE-2018-0313
                   CVE-2018-0307 CVE-2018-0301 CVE-2018-0295
                   CVE-2018-0293 CVE-2018-0292 CVE-2018-0291

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxossnmp
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxos-rbaccess
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxosbgp
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nx-os-cli-injection
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxosigmp
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxos-bo
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nx-os-api-execution
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxosrbac
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nxos-nxapi

Comment: This bulletin contains nine (9) Cisco Systems security advisories.

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Cisco Security Advisory: Cisco NX-OS Software Authenticated Simple Network 
Management Protocol Denial of Service Vulnerability

Advisory ID: cisco-sa-20180620-nxossnmp

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0291

CVSS Score v(3): 7.7 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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Summary

=======

A vulnerability in the Simple Network Management Protocol (SNMP) input packet
processor of Cisco NX-OS Software could allow an authenticated, remote 
attacker to cause the SNMP application on an affected device to restart 
unexpectedly.

The vulnerability is due to improper validation of SNMP protocol data units 
(PDUs) in SNMP packets. An attacker could exploit this vulnerability by 
sending a crafted SNMP packet to an affected device. A successful exploit 
could allow the attacker to cause the SNMP application to restart multiple 
times, leading to a system-level restart and a denial of service (DoS) 
condition.

Cisco has released software updates that address this vulnerability. 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-20180620-nxossnmp

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco NX-OS Software Role-Based Access Arbitrary Command Execution 
Vulnerability

Advisory ID: cisco-sa-20180620-nxos-rbaccess

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0337

CVSS Score v(3): 6.7 CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

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Summary

=======

A vulnerability in the role-based access-checking mechanisms of Cisco NX-OS 
Software could allow an authenticated, local attacker to execute arbitrary 
commands on an affected device.

The vulnerability exists because the affected software lacks proper input and
validation checks for certain file systems. An attacker could exploit this 
vulnerability by issuing crafted commands in the CLI of an affected device. A
successful exploit could allow the attacker to cause other users to execute 
unwanted, arbitrary commands on the affected device.

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-20180620-nxos-rbaccess

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software Border Gateway Protocol Denial 
of Service Vulnerability

Advisory ID: cisco-sa-20180620-nxosbgp

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0295

CVSS Score v(3): 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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Summary

=======

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.

Cisco has released software updates that address this vulnerability. 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-20180620-nxosbgp

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software CLI Arbitrary Command Execution
Vulnerability

Advisory ID: cisco-sa-20180620-nx-os-cli-injection

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0307

CVSS Score v(3): 8.2 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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Summary

=======

A vulnerability in the CLI of Cisco NX-OS Software could allow an 
authenticated, local attacker to perform a command-injection attack on an 
affected device.

The vulnerability is due to insufficient input validation of command 
arguments. An attacker could exploit this vulnerability by injecting malicious
command arguments into a vulnerable CLI command. A successful exploit could 
allow the attacker, authenticated as a privileged user, to execute arbitrary 
commands with root privileges.

Note: On products that support multiple virtual device contexts (VDC), this 
vulnerability could allow an attacker to access files from any VDC.

Cisco has released software updates that address this vulnerability. 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-20180620-nx-os-cli-injection

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software Internet Group Management 
Protocol Snooping Remote Code Execution and Denial of Service Vulnerability

Advisory ID: cisco-sa-20180620-nxosigmp

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0292

CVSS Score v(3): 8.8 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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Summary

=======

A vulnerability in the Internet Group Management Protocol (IGMP) Snooping 
feature of Cisco NX-OS Software could allow an unauthenticated, adjacent 
attacker to execute arbitrary code and gain full control of an affected 
system. The attacker could also cause an affected system to reload, resulting
in a denial of service (DoS) condition.

The vulnerability is due to a buffer overflow condition in the IGMP Snooping 
subsystem. An attacker could exploit this vulnerability by sending crafted 
IGMP packets to an affected system. An exploit could allow the attacker to 
execute arbitrary code and gain full control of the affected system or cause 
the affected system to reload, resulting in a DoS condition.

Cisco has released software updates that address this vulnerability. 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-20180620-nxosigmp

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software NX-API Arbitrary Code Execution
Vulnerability

Advisory ID: cisco-sa-20180620-nxos-bo

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0301

CVSS Score v(3): 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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Summary

=======

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an 
unauthenticated, remote attacker to craft a packet to the management interface
on an affected system, causing a buffer overflow.

The vulnerability is due to incorrect input validation in the authentication 
module of the NX-API subsystem. An attacker could exploit this vulnerability 
by sending a crafted HTTP or HTTPS packet to the management interface of an 
affected system with the NX-API feature enabled. An exploit could allow the 
attacker to execute arbitrary code as root.

Note: NX-API is disabled by default.

Cisco has released software updates that address this vulnerability. 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-20180620-nxos-bo

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software NX-API Arbitrary Command 
Execution Vulnerability

Advisory ID: cisco-sa-20180620-nx-os-api-execution

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0313

CVSS Score v(3): 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

+---------------------------------------------------------------------

Summary

=======

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an 
authenticated, remote attacker to send a malicious packet to the management 
interface on an affected system and execute a command-injection exploit.

The vulnerability is due to incorrect input validation of user-supplied data 
to the NX-API subsystem. An attacker could exploit this vulnerability by 
sending a malicious HTTP or HTTPS packet to the management interface of an 
affected system that has the NX-API feature enabled. A successful exploit 
could allow the attacker to execute arbitrary commands with root privileges.

Note: NX-API is disabled by default.

Cisco has released software updates that address this vulnerability. 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-20180620-nx-os-api-execution

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software Role-Based Access Control 
Elevated Privileges Vulnerability

Advisory ID: cisco-sa-20180620-nxosrbac

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0293

CVSS Score v(3): 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

+---------------------------------------------------------------------

Summary

=======

A vulnerability in role-based access control (RBAC) for Cisco NX-OS Software 
could allow an authenticated, remote attacker to execute CLI commands that 
should be restricted for a nonadministrative user. The attacker would have to
possess valid user credentials for the device.

The vulnerability is due to incorrect RBAC privilege assignment for certain 
CLI commands. An attacker could exploit this vulnerability by authenticating 
to a device as a nonadministrative user and executing specific commands from 
the CLI. An exploit could allow the attacker to run commands that should be 
restricted to administrative users. These commands could modify the 
configuration or boot image on the device.

Cisco has released software updates that address this vulnerability. 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-20180620-nxosrbac

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security 

==============================================================================

Cisco Security Advisory: Cisco NX-OS Software NX-API Privilege Escalation 
Vulnerability

Advisory ID: cisco-sa-20180620-nxos-nxapi

Revision: 1.0

For Public Release: 2018 June 20 16:00 GMT

Last Updated: 2018 June 20 16:00 GMT

CVE ID(s): CVE-2018-0330

CVSS Score v(3): 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

+---------------------------------------------------------------------

Summary

=======

A vulnerability in the NX-API management application programming interface 
(API) in devices running, or based on, Cisco NX-OS Software could allow an 
authenticated, remote attacker to execute commands with elevated privileges.

The vulnerability is due to a failure to properly validate certain parameters
included within an NX-API request. An attacker that can successfully 
authenticate to the NX-API could submit a request designed to bypass NX-OS 
role assignment. A successful exploit could allow the attacker to execute 
commands with elevated privileges.

Cisco has released software updates that address this vulnerability. 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-20180620-nxos-nxapi

This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security
Advisory Collection, which includes 24 Cisco Security Advisories that describe
24 vulnerabilities. For a complete list of the advisories and links to them, 
see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security

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