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Advisory ID:               SYSS-2023-005
Product:                   Omnis Studio
Manufacturer:              Omnis Software Ltd.
Affected Version(s):       10.22.00
Tested Version(s):         10.22.00
Vulnerability Type:        Expected Behavior Violation (CWE-440)
Risk Level:                Low
Solution Status:           Open
Manufacturer Notification: 2023-03-30
Solution Date:             -
Public Disclosure:         2023-07-20
CVE Reference:             CVE-2023-38335
Author of Advisory:        Matthias Deeg (SySS GmbH)

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Overview:

Omnis Studio is a rapid application development tool for developing
cross-platform software applications.

The manufacturer describes the product as follows:

"Omnis Studio is a powerful development environment that lets you deploy
apps to virtually any device, on any platform, including tablets,
smartphones, and desktop computers." [1]

Due to implementation issues, "always private" Omnis libraries can be
opened by the Omnis Studio browser.

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Vulnerability Details:

Omnis Studio supports a feature for making Omnis libraries "always
private".

Making an Omnis library "always private" is supposed to be an
irreversible operation according to the Omnis Studio software.

However, during a security analysis of an application developed with
Omnis Studio using this feature, Matthias Deeg found out that it is
still possible to load "always private" Omnis libraries with the Omnis
Studio browser by simply bypassing a specific check.

This violates the expected behavior of an "irreversible operation".

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC):

For demonstrating the described security issue, Matthias Deeg developed
a proof-of-concept software tool which allows loading private Omnis
libraries in the Omnis Studio browser.

>OmnisUnlocker.exe
                _____________________________________________________________
               /    _____       _____ _____                                  \
              /    /  ___|     /  ___/  ___|                                  \
             |     \ `--. _   _\ `--.\ `--.                                    |
             |      `--. \ | | |`--. \`--. \                                   |
             |     /\__/ / |_| /\__/ /\__/ /                                   |
              \    \____/ \__, \____/\____/   ... unlocks Omnis Studio!       /
               \          __/ |                                              /
               /         |___/    __________________________________________/
              / _________________/
        (__) /_/
        (oo)
  /------\/
 / |____||
*  ||   ||
   ^^   ^^
SySS Omnis Unlocker v1.0 by Matthias Deeg <matthias.deeg@syss.de> - (c) 2023

[+] The Omnis Studio process was patched successfully.
    Now you can:
        * load private Omnis libraries in the browser, and
        * analyze locked classes.

This security issue is also demonstrated in our SySS Proof of Concept 
Video "Reversing the Irreversible - Part I" on our YouTube channel [3].

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

SySS GmbH is not aware of a solution for the described security issue.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2023-03-30: Vulnerability reported to manufacturer
2023-04-06: Vulnerability reported to manufacturer again
2023-07-20: Public release of security advisory

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References:

[1] Product website for Omnis Studio
    https://www.omnis.net/
[2] SySS Security Advisory SYSS-2023-005
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2023-005.txt
[3] SySS Proof of Concept Video: Reversing the Irreversible - Part I
    https://www.youtube.com/watch?v=2fjMgPqjobQ
[4] SySS GmbH, SySS Responsible Disclosure Policy
    https://www.syss.de/en/responsible-disclosure-policy

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Credits:

This security vulnerability was found by Matthias Deeg of SySS GmbH.

E-Mail: matthias.deeg (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Matthias_Deeg.asc
Key Fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB

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Disclaimer:

The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS website.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en

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