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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1203
           Security Bulletins - Cisco Firepower System Software
                               19 April 2018

===========================================================================

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

Product:           Cisco Firepower System Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0254 CVE-2018-0244 CVE-2018-0243

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss1
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss2

Comment: This bulletin contains three (3) Cisco Systems security advisories.

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

Cisco Firepower System Software Server Message Block File Policy Bypass
Vulnerability

Medium
Advisory ID: cisco-sa-20180418-fss
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvg68807

CVE-2018-0243
CWE-693

CVSS Score: Base 5.8
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0243
CWE-693

Summary

  o A vulnerability in the detection engine of Cisco Firepower System Software
    could allow an unauthenticated, remote attacker to bypass a configured file
    action policy that is intended to drop the Server Message Block Version 2
    (SMB2) and SMB Version 3 (SMB3) protocols if malware is detected.

    The vulnerability is due to incorrect detection of an SMB2 or SMB3 file
    based on the total file length. An attacker could exploit this
    vulnerability by sending a crafted SMB2 or SMB3 transfer request through
    the targeted device. An exploit could allow the attacker to pass SMB2 or
    SMB3 files that could be malware even though the device is configured to
    block them. This vulnerability does not exist for SMB Version 1 (SMB1)
    files.

    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-fss

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Firepower System Software when one or more
    file action policies are configured. At the time of publication, this
    vulnerability affected all software releases prior to 6.2.3. For the latest
    and most detailed 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 At the time of publication, software release 6.2.3 contained the fix for
    this vulnerability. For the latest and most detailed 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.

Subscribe to Cisco Security Notifications

  o Subscribe

URL

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

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 Firepower System Software Server Message Block File Policy Bypass
Vulnerability

Medium
Advisory ID: cisco-sa-20180418-fss1
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvc20141

CVSS Score: Base 5.8
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0244
CWE-693

Summary

  o A vulnerability in the detection engine of Cisco Firepower System Software
    could allow an unauthenticated, remote attacker to bypass a configured file
    action policy to drop the Server Message Block (SMB) protocol if a malware
    file is detected.

    The vulnerability is due to how the SMB protocol handles a case in which a
    large file transfer fails. This case occurs when some pieces of the file
    are successfully transferred to the remote endpoint, but ultimately the
    file transfer fails and is reset. An attacker could exploit this
    vulnerability by sending a crafted SMB file transfer request through the
    targeted device. An exploit could allow the attacker to pass an SMB file
    that contains malware, which the device is configured to block.

    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-fss1

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Firepower System Software when one or more
    file action policies are configured. At the time of publication, this
    vulnerability affected all software releases prior to 6.2.3. For the latest
    and most detailed 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 At the time of publication, software release 6.2.3 contained the fix for
    this vulnerability. For the latest and most detailed 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.

Subscribe to Cisco Security Notifications

  o Subscribe

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss1

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 Firepower System Software Intelligent Application Bypass Vulnerability

Medium
Advisory ID: cisco-sa-20180418-fss2
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvf86435

CVSS Score: Base 5.8
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0254
CWE-693

Summary

  o A vulnerability in the detection engine of Cisco Firepower System Software
    could allow an unauthenticated, remote attacker to bypass configured file
    action policies if an Intelligent Application Bypass (IAB) with a drop
    percentage threshold is also configured.

    The vulnerability is due to incorrect counting of the percentage of dropped
    traffic. An attacker could exploit this vulnerability by sending network
    traffic to a targeted device. An exploit could allow the attacker to bypass
    configured file action policies, and traffic that should be dropped could
    be allowed into the network.

    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-fss2

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Firepower 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 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.

Subscribe to Cisco Security Notifications

  o Subscribe

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss2

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.

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

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