ESB-2018.1826.2 - UPDATE [Cisco] Cisco 5000 Series and Cisco UCS E-Series: Unauthorised access - Console/physical 2018-07-06

Printable version
PGP/GPG verifiable version

Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

Cisco 5000 Series Enterprise Network Compute System and Cisco UCS E-Series
             Servers BIOS Authentication Bypass Vulnerability
                                6 July 2018


        AusCERT Security Bulletin Summary

Product:           Cisco 5000 Series
                   Cisco UCS E-Series
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Console/Physical
Resolution:        Mitigation
CVE Names:         CVE-2018-0362  

Original Bulletin:

Revision History:  July  6 2018: A workaround has been added.
                   June 21 2018: Initial Release

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

Cisco 5000 Series Enterprise Network Compute System and Cisco UCS E-Series
Servers BIOS Authentication Bypass Vulnerability


Advisory ID:     cisco-sa-20180620-encs-ucs-bios-auth-bypass
First Published: 2018 June 20 16:00 GMT
Version 1.0:     Final
Workarounds:     Yes
Cisco Bug IDs:   CSCvh83260
CVSS Score:
Base 4.3


  * A vulnerability in BIOS authentication management of Cisco 5000 Series
    Enterprise Network Compute System and Cisco Unified Computing (UCS)
    E-Series Servers could allow an unauthenticated, local attacker to bypass
    the BIOS authentication and execute actions as an unprivileged user.

    The vulnerability is due to improper security restrictions that are
    imposed by the affected system. An attacker could exploit this
    vulnerability by submitting an empty password value to an affected
    device's BIOS authentication prompt. An exploit could allow the attacker
    to have access to a restricted set of user-level BIOS commands.

    There is a workaround that addresses this vulnerability.

    This advisory is available at the following link:

Affected Products

  * Vulnerable Products

    This vulnerability affects Cisco 5000 Series Enterprise Network Compute
    System and Cisco UCS E-Series Servers. For information about affected
    software releases, consult the Cisco bug ID(s) at the top of this

    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 UCS
    B-Series Blade Servers or Cisco UCS C-Series Servers.


  * Administrators can change the default, user-level BIOS password to a
    desired string. After updating the password, an empty password will no
    longer be accepted.

Fixed Software

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

    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

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.


  * This vulnerability was found during internal security testing.



Revision History

    | Version |         Description         |   Section   | Status |     Date     |
    | 1.1     | Updated the Workarounds     | Workarounds | Final  | 2018-July-05 |
    |         | section.                    |             |        |              |
    | 1.0     | Initial public release.     | ?           | Final  | 2018-June-20 |

- --------------------------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
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:

Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email:
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.


« Back to bulletins