Cisco NX-OS Software Cisco Fabric Services Denial of Service Vulnerability

A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a buffer overflow, resulting in a denial of service (DoS) condition.

The vulnerability is due to insufficient validation of Cisco Fabric Services packets. An attacker could exploit this vulnerability by sending a crafted Cisco Fabric Services packet to an affected device. A successful exploit could allow the attacker to cause a buffer overflow, resulting in process crashes and a DoS condition 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-20190306-nxos-fabric-dos

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Security Impact Rating: High

CVE: CVE-2019-1616

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Cisco Enterprise Chat and Email Cross-Site Scripting Vulnerabilities

Multiple vulnerabilities in the web-based management interface of Cisco Enterprise Chat and Email could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of the affected software.

The vulnerabilities are due to insufficient validation of user-supplied input by the web-based management interface of the affected software. An attacker could exploit these vulnerabilities either by injecting malicious code in a chat window or by sending a crafted link to a user of the interface. In both cases, the attacker must persuade the user to click the crafted link or open the chat window that contains the attacker’s code. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

There are no workarounds that address these vulnerabilities.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-chatmail-xss

Security Impact Rating: Medium

CVE: CVE-2019-1702

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Cisco FXOS and NX-OS Software CLI Command Injection Vulnerability (CVE-2019-1611)

A vulnerability in the CLI of Cisco NX-OS Software and Cisco FXOS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device.

The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

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-20190306-nxos-cmdinj-1611

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

This bundle contains several similar CLI command injection vulnerabilities; they differ primarily in which products and software versions are affected. See Details for more information.

Security Impact Rating: High

CVE: CVE-2019-1611

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Action Recommended to Secure the Cisco Nexus PowerOn Auto Provisioning Feature

Cisco Nexus devices support an automatic provisioning or zero-touch deployment feature called PowerOn Auto Provisioning (POAP). This feature assists in automating the initial deployment and configuration of Nexus switches. POAP is enabled by default and activates on devices that have no startup configuration or when Perpetual POAP has been configured using the boot poap enable command.

As with other automatic provisioning technologies, such as Cisco Zero-Touch Provisioning or Cisco Smart Install, some basic assumptions are made about the initial deployment environment. First, that administrators know that the feature exists and is enabled by default. Second, that the Layer 2 (L2) network on which a device initially connects is secure.

By design, the POAP feature leverages several unauthenticated protocols to obtain the initial configuration file for a device. When a device with POAP boots and subsequently fails to locate a startup configuration, such as on the first startup after unboxing or after a restoration of factory defaults, the device enters POAP mode. The device will attempt to locate a DHCP server through a connected management interface1. Then the switch will listen for a DHCP response that includes at a minimum the following:

  • An IP address
  • A default gateway
  • Option 66 (TFTP server name) or Option 150 (TFTP server address)
  • Option 67 (boot file name)

If the Nexus device receives multiple DHCP responses that meet these requirements, the first DHCP response received will be accepted, and POAP will move to the next stage of the device configuration. If no DHCP responses that meet these requirements are received prior to the timeout period, the device will exit POAP mode.

If a DHCP response is accepted, the Nexus device will attempt to connect to the provided TFTP server to retrieve the Python or Tool Command Language (Tcl) POAP configuration script specified within the boot file option. The switch will then execute the script to retrieve the specified software and device configuration. The Nexus device software and configuration may be retrieved using Secure Copy Protocol (SCP), FTP, or SFTP. The downloaded Nexus software will be assigned as the active image, with the configuration file scheduled to be applied when the device restarts.

Several steps in the POAP configuration process rely on a secure network segment to obtain critical startup information. While the POAP feature disables itself after a configurationis applied to a device2, it is critical that customers properly secure the networks in which POAP may be utilized. Some customers may want to disable the POAP feature and use other methods to configure a Nexus device out of the box. To this end, Cisco has added multiple new commands to disable POAP that will persist across a reset to factory defaults and the removal of a configuration. For guidelines on securing a POAP environment, as well as information about disabling the feature, see the Details and Recommendations sections.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-info-poap

1On some Nexus chassis-based devices, the DHCP solicitation may also be sent using all front-panel Ethernet interfaces of the installed router processor.

2The POAP feature will not be disabled if Perpetual POAP has been configured using the boot poap enable command and will run on each reload of the device.

Security Impact Rating: Informational

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Cisco NX-OS Software CLI Command Injection Vulnerability (CVE-2019-1609)

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device.

The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

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-20190306-nxos-cmdinj-1609

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

This bundle contains several similar CLI command injection vulnerabilities; they differ primarily in which products and software versions are affected. See Details for more information.

Security Impact Rating: High

CVE: CVE-2019-1609

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Cisco DNA Center Access Contract Stored Cross-Site Scripting Vulnerability

A vulnerability in the web-based management interface of Cisco DNA Center could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of an affected device.

The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive browser-based information.

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-20190306-dna-xss

Security Impact Rating: Medium

CVE: CVE-2019-1707

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Cisco NX-OS Software CLI Command Injection Vulnerability (CVE-2019-1610)

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device.

The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

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-20190306-nxos-cmdinj-1610

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

This bundle contains several similar CLI command injection vulnerabilities; they differ primarily in which products and software versions are affected. See Details for more information.

Security Impact Rating: High

CVE: CVE-2019-1610

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Cisco NX-OS Software NX-API Arbitrary Code Execution Vulnerability

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary code as root.

The vulnerability is due to incorrect input validation in the NX-API feature. An attacker could exploit this vulnerability by sending a crafted HTTP or HTTPS request to an internal service on an affected device that has the NX-API feature enabled. A successful exploit could allow the attacker to cause a buffer overflow and execute arbitrary code as root.

Note: The NX-API feature 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-20190306-nxos-api-ex

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Security Impact Rating: High

CVE: CVE-2019-1605

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Cisco NX-OS Software CLI Command Injection Vulnerability (CVE-2019-1612)

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device.

The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

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-20190306-nxos-cmdinj-1612

This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

This bundle contains several similar CLI command injection vulnerabilities; they differ primarily in which products and software versions are affected. See Details for more information.

Security Impact Rating: High

CVE: CVE-2019-1612

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Cisco Nexus 5600 and 6000 Series Switches Fibre Channel over Ethernet Denial of Service Vulnerability

A vulnerability in the Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

The vulnerability is due to an incorrect allocation of an internal interface index. An adjacent attacker with the ability to submit a crafted FCoE packet that crosses affected interfaces could trigger this vulnerability. A successful exploit could allow the attacker to cause a packet loop and high throughput on the affected interfaces, 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-20190306-nexus-fbr-dos

Security Impact Rating: Medium

CVE: CVE-2019-1595

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