ESB-2018.3494 - [Cisco] Cisco Firepower: Unauthorised access - Remote/unauthenticated 2018-11-08

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3494
         Cisco Firepower System Software receives security update
                              8 November 2018

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

Product:           Cisco Firepower
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15443  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181107-fde-tcp-bypass

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Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass
Vulnerability

Priority: Medium
Advisory ID: cisco-sa-20181107-fde-tcp-bypass
First Published: 2018 November 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvk76547
 
CVE-2018-15443
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

Summary

  * 
    A vulnerability in the detection engine of Cisco Firepower System Software
    could allow an unauthenticated, remote attacker to bypass a configured
    Intrusion Prevention System (IPS) rule that inspects certain types of TCP
    traffic.

    The vulnerability is due to incorrect TCP retransmission handling. An
    attacker could exploit this vulnerability by sending a crafted TCP
    connection request through an affected device. A successful exploit could
    allow the attacker to bypass configured IPS rules and allow uninspected
    traffic onto 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-20181107-fde-tcp-bypass

Affected Products

  * Vulnerable Products

    This vulnerability affects Cisco Firepower System Software releases before
    the first fixed release where the device is configured with an IPS rule for
    TCP traffic inspection.

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

    Products Confirmed Not Vulnerable

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

Workarounds

  * There are no workarounds that address this vulnerability.

Fixed Software

  * 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

  * 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

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

URL

  * https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20181107-fde-tcp-bypass

Revision History

  * 
    +----------------------------------------------------------------------------+
    | Version |        Description        | Section | Status |       Date        |
    |---------+---------------------------+---------+--------+-------------------|
    | 1.0     | Initial public release.   | -       | Final  | 2018-November-07  |
    +----------------------------------------------------------------------------+

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