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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
===========================================================================
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.
- --------------------------BEGIN INCLUDED TEXT--------------------
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
+---------------------------------------------------------------------
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
+---------------------------------------------------------------------
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
+---------------------------------------------------------------------
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
+---------------------------------------------------------------------
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
+---------------------------------------------------------------------
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
+---------------------------------------------------------------------
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
- --------------------------END INCLUDED TEXT--------------------
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