ESB-2018.0920 - [Cisco] Cisco IOS XE: Root compromise - Existing account 2018-03-29

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0920
        Cisco IOS XE Software CLI Command Injection Vulnerabilities
                               29 March 2018

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

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

Product:           Cisco IOS XE
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0194 CVE-2018-0193 CVE-2018-0185
                   CVE-2018-0182  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-cmdinj

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco IOS XE Software CLI Command Injection Vulnerabilities

Medium

Advisory ID:     cisco-sa-20180328-cmdinj

First Published: 2018 March 28 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:
CSCuz03145
CSCuz56419
CSCva31971
CSCvb09542

CVE-2018-0182
CVE-2018-0185
CVE-2018-0193
CVE-2018-0194

CWE-78

CVSS Score:
5.3  AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X

Summary

  o Multiple vulnerabilities in the CLI parser of Cisco IOS XE Software could
    allow an authenticated, local attacker to inject arbitrary commands into
    the CLI of the affected software, which could allow the attacker to gain
    access to the underlying Linux shell of an affected device and execute
    commands with root privileges on the device.

    The vulnerabilities exist because the affected software does not
    sufficiently sanitize command arguments before passing commands to the
    Linux shell for execution. An attacker could exploit these vulnerabilities
    by submitting a malicious CLI command to the affected software. A
    successful exploit could allow the attacker to break from the CLI of the
    affected software, which could allow the attacker to gain access to the
    underlying Linux shell on an affected device and execute arbitrary commands
    with root privileges on the device.

    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-20180328-cmdinj

Affected Products

  o Vulnerable Products

    These vulnerabilities affect Cisco devices that are running a vulnerable
    release of Cisco IOS XE Software.

    For information about which Cisco IOS XE Software releases are vulnerable,
    consult the Cisco bug ID(s) at the top of this advisory.

    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

    No other Cisco products are currently known to be affected by these
    vulnerabilities.

    Cisco has confirmed that these vulnerabilities do not affect Cisco IOS
    Software, Cisco IOS XR Software, or Cisco NX-OS Software.

Workarounds

  o There are no workarounds that address these vulnerabilities.

Fixed Software

  o For detailed information about fixed software releases, consult the Cisco
    bug ID(s) at the top of this advisory.

    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.

    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.

Exploitation and Public Announcements

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

Source

  o These vulnerabilities were found during internal security testing.

Cisco Security Vulnerability Policy

  o 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

  o Subscribe

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-cmdinj

Revision History

  o 
    +----------+----------------------------+----------+---------+----------------+
    | Version  |        Description         | Section  | Status  |      Date      |
    +----------+----------------------------+----------+---------+----------------+
    | 1.0      | Initial public release.    | --       | Final   | 2018-March-28  |
    +----------+----------------------------+----------+---------+----------------+

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=3frh
-----END PGP SIGNATURE-----

« Back to bulletins