[SYSS-2017-006] agorum core Pro - Insecure Direct Object Reference

Advisory ID: SYSS-2017-006
Product: agorum core Pro
Manufacturer: agorum Software GmbH
Affected Version(s): 7.8.1.4-251
Tested Version(s): 7.8.1.4-251
Vulnerability Type: Insecure Direct Object Reference (CWE-932)
Risk Level: High
Solution Status: Open
Manufacturer Notification: 2017-02-06
Solution Date: 2017-04-06
Public Disclosure: 2017-04-12
CVE Reference: Not yet assigned
Author of Advisory: Dr. Erlijn van Genuchten & Sascha Grimmeisen, SySS GmbH

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Overview:

agorum core Pro is a module based Document Management System. It allows
the customer to buy only required modules and can be extended when
needed.

Due to the possibility to access these modules using the correct URL,
the DMS is vulnerable to insecure direct object reference, causing
unauthorized access to functions and content.

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Vulnerability Details:

SySS GmbH found out that nonadministrative users can obtain unauthorized
access to modules and content by entering the correct URL.

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Proof of Concept (PoC):

A nonadministrative user is able to access modules and content that
should only be accessible by administrative users. For example, the
DocForm module can be accessed using the following URL:

https://[HOST]/roiwebui/docform_module/?_nc=[VALUE]

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Solution:

Update to agorum core 7.11.3. [4]

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Disclosure Timeline:

2017-01-30: Vulnerability discovered
2017-02-06: Vulnerability reported to manufacturer
2017-04-06: Public disclosure
2017-04-06: Fix confirmed by manufacturer
2017-04-12: Vulnerability published

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References:

[1] Product website for agorum Software GmbH
    http://mein-dms.agorum.com/
[2] SySS Security Advisory SYSS-2017-006
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2017-006.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/
[4] Agorum Change Log
    https://d4w.agorum.com/roiwebui/files/520986548/Changelog.html

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Credits:

This security vulnerability was found by Dr. Erlijn van Genuchten and
Sascha Grimmeisen of SySS GmbH.

E-Mail: erlijn.vangenuchten@syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Erlijn_van_Genuchten.asc
Key ID: 0xBD96FF2A
Key Fingerprint: 17BB 4CED 755A CBB3 2D47 C563 0CA5 8637 BD96 FF2A

E-Mail: sascha.grimmeisen@syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Sascha_Grimmeisen.asc
Key ID: 0xD3D9C868
Key Fingerprint: 4937 7FCF BA8E 3D80 1AAD 4AC4 7C1D E510 D3D9 C868

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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 Web
site.

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Copyright:

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