Operating System:

[Cisco]

Published:

21 January 2021

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0253
             Cisco StarOS IPv4 Denial of Service Vulnerability
                              21 January 2021

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

Product:           Cisco StarOS
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1353  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr-mem-leak-dos-MTWGHKk3

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Cisco StarOS IPv4 Denial of Service Vulnerability

Priority:        Medium
Advisory ID:     cisco-sa-asr-mem-leak-dos-MTWGHKk3
First Published: 2021 January 20 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvq83868 CSCvv69023
CVE Names:       CVE-2021-1353
CWEs:            CWE-401

Summary

  o A vulnerability in the IPv4 protocol handling of Cisco StarOS could allow
    an unauthenticated, remote attacker to cause a denial of service (DoS)
    condition on an affected device.

    The vulnerability is due to a memory leak that occurs during packet
    processing. An attacker could exploit this vulnerability by sending a
    series of crafted IPv4 packets through an affected device. A successful
    exploit could allow the attacker to exhaust the available memory and cause
    an unexpected restart of the npusim process, leading to a DoS condition on
    the affected 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-asr-mem-leak-dos-MTWGHKk3

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected the following Cisco
    products if they were running a release of Cisco StarOS earlier than
    Release 21.22.0 and had the Vector Packet Processing (VPP) feature enabled:

       ASR 5000 Series Aggregation Services Routers
       Virtualized Packet Core-Single Instance (VPC-SI)

    The VPP feature is disabled by default.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

    Determine the VPP Configuration

    To see if the VPP feature is enabled, use the show task table process
    vpp_main all command. If the command output lists the vpp_main process, the
    feature is enabled. The following is a sample output with the VPP feature
    enabled:

        [local]swch# show task table process vpp_main all
                task                                             parent
         cpu facility                 inst    pid pri node  facility      inst    pid
        ----   ----------------------------------------------  -------------------------
         1/0 vpp_main   1005729   5729   0  all  -                0      0

    Products Confirmed Not Vulnerable

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

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o When considering software upgrades , customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories 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.

    Fixed Releases

    At the time of publication, Cisco StarOS releases 21.22.0 and later
    contained the fix for this vulnerability.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

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 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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr-mem-leak-dos-MTWGHKk3

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-JAN-20  |
    +----------+---------------------------+----------+--------+--------------+

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