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             AUSCERT External Security Bulletin Redistribution

       Cisco Email Security Appliance Header Injection Vulnerability
                              1 October 2019


        AusCERT Security Bulletin Summary

Product:           Cisco Email Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1955  

Original Bulletin: 

Revision History:  October 1 2019: Updated vulnerable product information
                   August  8 2019: Initial Release

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

Cisco Email Security Appliance Header Injection Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-20190807-esm-inject

First Published: 2019 August 7 16:00 GMT

Last Updated:    2019 September 26 20:01 GMT

Version 1.1:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvp27126



CVSS Score:


  o A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco
    AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an
    unauthenticated, remote attacker to bypass configured user filters on the

    The vulnerability is due to incomplete input and validation checking
    mechanisms for certain SPF messages that are sent to an affected device. An
    attacker could exploit this vulnerability by sending a customized SPF
    packet to an affected device. A successful exploit could allow the attacker
    to bypass the header filters that are configured for the affected device,
    which could allow malicious content to pass through the device.

    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.

    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

    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 Cisco would like to thank Marcel Maeder of Netcloud AG for reporting this

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        |
    | 1.1     | Updated vulnerable   | Affected  | Final  | 2019-September-26 |
    |         | product information. | Products  |        |                   |
    | 1.0     | Initial public       | -         | Final  | 2019-August-07    |
    |         | release.             |           |        |                   |

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

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