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             AUSCERT External Security Bulletin Redistribution

           Cisco Email Security Appliance Uncontrolled Resource
                         Exhaustion Vulnerability
                               6 March 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Email Security Appliances
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
                   Reduced Security  -- Remote/Unauthenticated
Resolution:        None
CVE Names:         CVE-2020-3181  

Original Bulletin: 

Revision History:  March 6 2020: Updated fixed and vulnerable release information
                   March 5 2020: Initial Release

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

Cisco Email Security Appliance Uncontrolled Resource Exhaustion Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-esa-resource-exhaust-D7RQAhnD

First Published: 2020 March 4 16:00 GMT

Last Updated:    2020 March 5 15:50 GMT

Version 1.1:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvr96489



CVSS Score:


  o A vulnerability in the malware detection functionality in Cisco Advanced
    Malware Protection (AMP) in Cisco AsyncOS Software for Cisco Email Security
    Appliances (ESAs) could allow an unauthenticated remote attacker to exhaust
    resources on an affected device.

    The vulnerability is due to insufficient control over system memory
    allocation. An attacker could exploit this vulnerability by sending a
    crafted email through the targeted device. A successful exploit could allow
    the attacker to cause an email attachment that contains malware to be
    delivered to a user and cause email processing delays.

    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:

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected Cisco AsyncOS
    Software for Cisco ESA releases earlier than Release 13.0.0.

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

    Products Confirmed Not Vulnerable

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


  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 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

    Fixed Releases

    At the time of publication, Cisco AsyncOS Software for Cisco ESA releases
    13.0.0 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.


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

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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

  o +---------+-------------------+------------------+--------+---------------+
    | Version |    Description    |     Section      | Status |     Date      |
    |         | Updated fixed and | Summary,         |        |               |
    | 1.1     | vulnerable        | Vulnerable       | Final  | 2020-March-05 |
    |         | release           | Products, Fixed  |        |               |
    |         | information.      | Releases         |        |               |
    | 1.0     | Initial public    | -                | Final  | 2020-March-04 |
    |         | release.          |                  |        |               |

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

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