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                         AUSCERT Security Bulletin

                               ASB-2021.0221
                   Oracle Essbase Critical Patch Update
                              20 October 2021

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

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

Product:          Essbase Administration Services
Operating System: Windows
                  UNIX variants (UNIX, Linux, OSX)
Impact/Access:    Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                  Modify Arbitrary Files          -- Existing Account      
                  Denial of Service               -- Remote/Unauthenticated
                  Access Confidential Data        -- Existing Account      
Resolution:       Patch/Upgrade
CVE Names:        CVE-2021-35655 CVE-2021-35654 CVE-2021-35653
                  CVE-2021-35652 CVE-2021-35651 

OVERVIEW

        Multiple vulnerabilities have been identified in :
         o Essbase Administration Services, versions prior to 11.1.2.4.46
        [1]


IMPACT

        The vendor has provided the following information regarding the
        vulnerabilities:
        
        "This Critical Patch Update contains 5 new security patches for
        Oracle Essbase. 3 of these vulnerabilities may be remotely
        exploitable without authentication, i.e., may be exploited over a
        network without requiring user credentials." [1]
        
        CVE-2021-35651
          8.5 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
        The supported version that is affected is Prior to 11.1.2.4.046.
        Easily exploitable vulnerability allows low privileged attacker with
        network access via HTTP to compromise Essbase Administration
        Services. While the vulnerability is in Essbase Administration
        Services, attacks may significantly impact additional products.
        Successful attacks of this vulnerability can result in unauthorized
        access to critical data or complete access to all Essbase
        Administration Services accessible data as well as unauthorized
        update, insert or delete access to some of Essbase Administration
        Services accessible data.
         Affects:
         o Essbase Administration Services Prior to 11.1.2.4.046
        
        CVE-2021-35653
          7.7 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
        The supported version that is affected is Prior to 11.1.2.4.046.
        Easily exploitable vulnerability allows low privileged attacker with
        network access via HTTP to compromise Essbase Administration
        Services. While the vulnerability is in Essbase Administration
        Services, attacks may significantly impact additional products.
        Successful attacks of this vulnerability can result in unauthorized
        access to critical data or complete access to all Essbase
        Administration Services accessible data.
         Affects:
         o Essbase Administration Services Prior to 11.1.2.4.046
        
        CVE-2021-35654
          7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
        The supported version that is affected is Prior to 11.1.2.4.046.
        Easily exploitable vulnerability allows unauthenticated attacker with
        network access via HTTP to compromise Essbase Administration
        Services. Successful attacks of this vulnerability can result in
        unauthorized ability to cause a hang or frequently repeatable crash
        (complete DOS) of Essbase Administration Services.
         Affects:
         o Essbase Administration Services Prior to 11.1.2.4.046
        
        CVE-2021-35655
          5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
        The supported version that is affected is Prior to 11.1.2.4.046.
        Easily exploitable vulnerability allows unauthenticated attacker with
        network access via HTTP to compromise Essbase Administration
        Services. Successful attacks of this vulnerability can result in
        unauthorized read access to a subset of Essbase Administration
        Services accessible data.
         Affects:
         o Essbase Administration Services Prior to 11.1.2.4.046
        
        CVE-2021-35652
          10.0 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
        The supported version that is affected is Prior to 11.1.2.4.046.
        Easily exploitable vulnerability allows unauthenticated attacker with
        network access via HTTP to compromise Essbase Administration
        Services. While the vulnerability is in Essbase Administration
        Services, attacks may significantly impact additional products.
        Successful attacks of this vulnerability can result in takeover of
        Essbase Administration Services.
         Affects:
         o Essbase Administration Services Prior to 11.1.2.4.046


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 2021
            https://www.oracle.com/security-alerts/cpuoct2021.html

        [2] Text Form of Oracle Critical Patch Update - October 2021 Risk
            Matrices
            https://www.oracle.com/security-alerts/cpuoct2021verbose.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.

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