Operating System:

[Linux]

Published:

29 January 2019

Protect yourself against future threats.

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                         AUSCERT Security Bulletin

                               ASB-2019.0041
     McAfee Security Bulletin - Data Exchange Layer update fixes three
    vulnerabilities (CVE-2018-5391, CVE-2018-15473, and CVE-2018-0737)
                              29 January 2019

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

Product:              McAfee Data Exchange Layer Broker Platform
Operating System:     Linux variants
Impact/Access:        Access Privileged Data   -- Existing Account      
                      Denial of Service        -- Remote/Unauthenticated
                      Access Confidential Data -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2018-15473 CVE-2018-5391 CVE-2018-0737
Member content until: Thursday, February 28 2019
Reference:            ASB-2018.0311
                      ASB-2018.0272
                      ESB-2018.3904

OVERVIEW

        Multiple vulnerabilities have been identified in McAfee Data Exchange 
        Layer (DXL) Broker Platform in versions prior to 4.1.2 
        Hotfix 1 (HF1). [1]


IMPACT

        Details of the vulnerabilities can be found below:
        
        "CVE-2018-5391
        The Linux kernel, versions 3.9+, is vulnerable to a denial-of-service
        attack with low rates of specially modified packets targeting IP fragment
        re-assembly. An attacker may cause a denial of service condition by sending
        specially crafted IP fragments. Various vulnerabilities in IP fragmentation
        have been discovered and fixed over the years. The current vulnerability
        (CVE-2018-5391) became exploitable in the Linux kernel with the increase of
        the IP fragment reassembly queue size.
        https://nvd.nist.gov/vuln/detail/CVE-2018-5391
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5391
         
        CVE-2018-15473
        OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not
        delaying bailout for an invalid authenticating user until after the packet
        containing the request has been fully parsed, related to auth2-gss.c,
        auth2-hostbased.c, and auth2-pubkey.c.
        https://nvd.nist.gov/vuln/detail/CVE-2018-15473
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15473
         
        CVE-2018-0737
        The OpenSSL RSA Key generation algorithm has been shown to be vulnerable to
        a cache timing side channel attack. An attacker with sufficient access to
        mount cache timing attacks during the RSA key generation process could
        recover the private key. Fixed in OpenSSL 1.1.0i-dev (Affected
        1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2b-1.0.2o).
        https://nvd.nist.gov/vuln/detail/CVE-2018-0737
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-0737" [1]


MITIGATION

        McAfee recommends installing or updating to the following versions:
        
        "McAfee Data Exchange Layer Broker Platform 4.1.2 HF1" [1]


REFERENCES

        [1] McAfee Security Bulletin - Data Exchange Layer update fixes three
            vulnerabilities (CVE-2018-5391, CVE-2018-15473, and CVE-2018-0737)
            https://kc.mcafee.com/corporate/index?page=content&id=SB10266

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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