Wednesday, March 27, 2019

Cisco IOS and IOS XE Software Information Disclosure Vulnerability

Medium
Advisory ID:
cisco-sa-20190327-info
First Published:
2019 March 27 16:00 GMT
Version 1.0:
Workarounds:
No workarounds available
Cisco Bug IDs:
CVE-2019-1762
CWE-200
CVSS Score:
Base 4.4Click Icon to Copy Verbose Score
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
CVE-2019-1762
CWE-200

Summary

  • A vulnerability in the Secure Storage feature of Cisco IOS and IOS XE Software could allow an authenticated, local attacker to access sensitive system information on an affected device.

    The vulnerability is due to improper memory operations performed at encryption time, when affected software handles configuration updates. An attacker could exploit this vulnerability by retrieving the contents of specific memory locations of an affected device. A successful exploit could result in the disclosure of keying materials that are part of the device configuration, which can be used to recover critical system information.

    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-20190327-info

Affected Products

  • Vulnerable Products

    This vulnerability affects Cisco devices with the Secure Storage feature enabled that are running a vulnerable release of Cisco IOS or IOS XE Software.

    There are two bugs linked to this advisory that both address the same vulnerability:

    • Cisco bug CSCvg97571 was raised to address the code changes in Cisco IOS Software Release 15.6(3) M1 or subsequent releases.
    • Cisco bug CSCvi66418  was raised to address the code changes in Cisco IOS XE Software Release 16.6.1 or subsequent releases.

    For information about which Cisco IOS and IOS XE Software releases are vulnerable, see the Fixed Software section of this advisory.

    Determining Whether Secure Storage is Enabled

    There are two methods for determining whether the Secure Storage feature is enabled on a device:

    Option 1: Using the show running-config all | include service private-config-encryption Command.

    To determine whether a device is configured with the Secure Storage feature enabled, use the show running-config all | include service private-config-encryption privileged EXEC command on the device. The following example shows the output of the show running-config all | include service private-config-encryption command on a Cisco device that has the Secure Storage feature enabled.

    Router# show running-config all | include service private-config-encryption
    service private-config-encryption

    If this command does not exist, or if it produces any other output, the device is not affected by the vulnerability described in this advisory.

    Option 2: Using the show parser encrypt file status | include Feature Command.

    To determine whether the Secure Storage feature is enabled on a device, use the show parser encrypt file status | include Feature privileged EXEC command on the device. The following example shows the output of the show parser encrypt file status | include Feature command on a Cisco device that has the Secure Storage feature enabled.

    Router# show parser encrypt file status | include Feature
    Feature: Enabled

    If this command does not exist, or if it produces any other output, the device is not affected by the vulnerability described in this advisory.

    Determining the Cisco IOS Software Release

    To determine which Cisco IOS Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. If the device is running Cisco IOS Software, the system banner displays text similar to Cisco Internetwork Operating System Software or Cisco IOS Software. The banner also displays the installed image name in parentheses, followed by the Cisco IOS Software release number and release name. Some Cisco devices do not support the show version command or may provide different output.

    The following example shows the output of the command for a device that is running Cisco IOS Software Release 15.5(2)T1 and has an installed image name of C2951-UNIVERSALK9-M:

    Router> show version Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc. Compiled Mon 22-Jun-15 09:32 by prod_rel_team . . .

    For information about the naming and numbering conventions for Cisco IOS Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Determining the Cisco IOS XE Software Release

    To determine which Cisco IOS XE Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. If the device is running Cisco IOS XE Software, the system banner displays Cisco IOS Software, Cisco IOS XE Software, or similar text.

    The following example shows the output of the command for a device that is running Cisco IOS XE Software Release 16.2.1 and has an installed image name of CAT3K_CAA-UNIVERSALK9-M:

    ios-xe-device# show version Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2016 by Cisco Systems, Inc. Compiled Sun 27-Mar-16 21:47 by mcpre . . .

    For information about the naming and numbering conventions for Cisco IOS XE Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

    Cisco has confirmed that this vulnerability does not affect Cisco IOS XR Software or Cisco NX-OS Software.

Details

  • The Cisco IOS and IOS XE Software Secure Storage feature allows administrators to secure critical configuration information by storing it in an encrypted form. An affected software release may not perform a complete encryption buffer cleanup, which may result in the storage of an unencrypted version of the configuration file together with the encrypted version. An attacker can take advantage of this vulnerability by retrieving the contents of specific memory locations mapped to a storage device that is used to store the device configuration.

Workarounds

  • There are no workarounds that address this vulnerability.

Fixed Software

  • For detailed information about affected and fixed software releases, consult the Cisco IOS Software Checker.

    When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.

    In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

    Cisco IOS and IOS XE Software

    To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker, that identifies any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (“Combined First Fixed”).

    Customers can use this tool to perform the following tasks:

    • Initiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse
    • Enter the output of the show version command for the tool to parse
    • Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication

    To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS or IOS XE Software release—for example, 15.1(4)M2 or 3.13.8S—in the following field:

    By default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list.

    For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the Cisco IOS XE Software release.

Exploitation and Public Announcements

  • The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

  • This vulnerability was found during the resolution of a Cisco TAC support case.

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

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Revision History

  • Version Description Section Status Date
    1.0 Initial public release. — Final 2019-March-27
    Show Less

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications



from Cisco Security Advisory https://ift.tt/2WqZz3q
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