Oracle Support Tools: Denial of Service -- Remote with User Interaction

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                         AUSCERT Security Bulletin

                               ASB-2018.0264
                           Oracle Support Tools
                              17 October 2018

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

Product:              Oracle Support Tools
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Denial of Service -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2018-0739  
Member content until: Friday, November 16 2018
Reference:            ASB-2018.0164
                      ASB-2018.0159
                      ESB-2018.2324
                      ESB-2018.2307

OVERVIEW

        A vulnerability has been identified in :
         o OSS Support Tools, versions prior to 18.4
        [1]


IMPACT

        The vendor has provided the following information regarding the
        vulnerability:
        
        "This Critical Patch Update contains 1 new security fix for Oracle
        Support Tools. This vulnerability is remotely exploitable without
        authentication, i.e., may be exploited over a network without
        requiring user credentials." [1]
        
        "CVE-2018-0739
        
        6.5
        
        AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
        
        Vulnerability in the OSS Support Tools component of Oracle Support 
        Tools (subcomponent: Services Tools Bundle (OpenSSL)). The supported
        version that is affected is Prior to 18.4. Easily exploitable 
        vulnerability allows unauthenticated attacker with network access 
        via HTTP to compromise OSS Support Tools. Successful attacks require
        human interaction from a person other than the attacker. Successful
        attacks of this vulnerability can result in unauthorized ability to
        cause a hang or frequently repeatable crash (complete DOS) of OSS 
        Support Tools."
        [2]


MITIGATION

        Oracle states:
        
        "Due to the threat posed by a successful attack, Oracle strongly
        recommends that customers apply CPU fixes as soon as possible. Until
        you apply the CPU fixes, it may be possible to reduce the risk of
        successful attack by blocking network protocols required by an
        attack. For attacks that require certain privileges or access to
        certain packages, removing the privileges or the ability to access
        the packages from users that do not need the privileges may help
        reduce the risk of successful attack. Both approaches may break
        application functionality, so Oracle strongly recommends that
        customers test changes on non-production systems. Neither approach
        should be considered a long-term solution as neither corrects the
        underlying problem." [1]


REFERENCES

        [1] Oracle Critical Patch Update Advisory - October 2018
            https://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

        [2] Text Form of Oracle Critical Patch Update - October 2018 Risk
            Matrices
            https://www.oracle.com/technetwork/security-advisory/cpuoct2018verbose-5170927.html

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.

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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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