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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1216
        Cisco StarOS IPsec Manager Denial of Service Vulnerability
                               19 April 2018

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

Product:           Cisco StarOS IPsec Manager
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0273  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-starosasr

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Cisco StarOS IPsec Manager Denial of Service Vulnerability

Medium

Advisory ID:      cisco-sa-20180418-starosasr

First Published:  2018 April 18 16:00 GMT

Version 1.0:      Final

Workarounds:      No workarounds available

Cisco Bug IDs:    CSCve29605
                  CVE-2018-0273
                  CWE-399

CVSS Score:       5.3

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X

Summary

  o A vulnerability in the IPsec Manager of Cisco StarOS for Cisco Aggregation
    Services Router (ASR) 5000 Series Routers and Virtualized Packet Core (VPC)
    System Software could allow an unauthenticated, remote attacker to
    terminate all active IPsec VPN tunnels and prevent new tunnels from being
    established, resulting in a denial of service (DoS) condition.

    The vulnerability is due to improper processing of corrupted Internet Key
    Exchange Version 2 (IKEv2) messages. An attacker could exploit this
    vulnerability by sending crafted IKEv2 messages toward an affected router.
    A successful exploit could allow the attacker to cause the ipsecmgr service
    to reload. A reload of this service could cause all IPsec VPN tunnels to be
    terminated and prevent new tunnels from being established until the service
    has restarted, 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-20180418-starosasr

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products when they are
    running Cisco StarOS:

      - Cisco Aggregation Services Router (ASR) 5000 Series Routers
      - Virtualized Packet Core (VPC) System Software

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

    Products Confirmed Not Vulnerable

    No other Cisco products are currently known to be affected by this
    vulnerability.

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o 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
    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 vulnerability that is
    described in this advisory.

Source

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

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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180418-starosasr

Revision History

  o 
    +----------+----------------------------+----------+---------+----------------+
    | Version  |        Description         | Section  | Status  |      Date      |
    +----------+----------------------------+----------+---------+----------------+
    | 1.0      | Initial public release.    | --       | Final   | 2018-April-18  |
    +----------+----------------------------+----------+---------+----------------+

- -------------------------------------------------------------------------------

Legal Disclaimer

  o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
    OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
    FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
    OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
    THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

    A standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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.

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