TestLink Open Source Test Management Insecure Direct Object Reference

TestLink Open Source Test Management versions prior to 1.9.17 suffer from an insecure direct object reference.

MD5 | 64c620e2f1d03d7aaf509219b7585ba8

SEC Consult Vulnerability Lab Security Advisory < 20180228-0 >
title: Insecure Direct Object Reference
product: TestLink Open Source Test Management
vulnerable version: <1.9.17
fixed version: 1.9.17 (after November 2017), and the current
"testlink_1_9" branch
CVE number: -
impact: Medium
homepage: http://testlink.org/
found: 2017-09-22
by: T. Weber (Office Vienna)
SEC Consult Vulnerability Lab

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Vendor description:
"TestLink is a web based test management and test execution system.
It enables quality assurance teams to create and manage their test
cases as well as to organize them into test plans. These test plans
allow team members to execute test cases and track test results

Source: https://github.com/TestLinkOpenSourceTRMS/testlink-code

Business recommendation:
SEC Consult advises to immediately install the available updates as attackers
might gain access to sensitive data belonging to other users.

A thorough security review performed by security professionals is highly
recommended in order to identify potential further security deficiencies.

Vulnerability overview/description:
1) Insecure Direct Object Reference
An unauthenticated user can gain access to referenced files which are produced by
different test cases. By using a simple ID iterator, all produced output
data can be gathered from the whole system.

The actual impact strongly depends on the classification of the produced data
which is referenced. Therefore, the risk can vary from low to critical
depending on the use case.

Proof of concept:
1) Insecure Direct Object Reference
An unauthenticated attacker can download data from the TestLink environment
by using the following url:

The tag <IP-Address> specifies the target address and can also include a sub-
folder where the hosted TestLink application is located.

Vulnerable / tested versions:
The following versions have been tested and are vulnerable. It is assumed that
older versions are affected as well, e.g.:
* 1.9.16
* 1.9.15
* 1.9.14

Vendor contact timeline:
2017-10-18: Contacting vendor through http://mantis.testlink.org
Vendor requested the information.
2017-10-19: Asked if the advisory should be uploaded to mantis directly.
2017-10-21: Contact agreed.
2017-10-23: Uploaded the advisory to mantis.
2017-11-01: Contact provided a fix for 1.9.16. Fixes will be created for
1.9.15 and 1.9.14 too. Vendor asked us for verification.
2017-11-07: Stated that verification is not possible at the moment (no test
instance) and that it can be verified easily with the PoC
2018-01-09: Asked for status update; No answer.
2018-01-29: Asked for status update; No answer.
2018-02-16: Asked for status update.
2018-02-17: Vendor responded that we can re-check the fix or release the
2018-02-19: Asked the vendor for reachable test-instance, reply: there is
no test instance
2018-02-28: Public release of security advisory

Check-out the current testlink-code on branch "testlink_1_9":

The following commit contains the fix since 2017-11-01:

Upgrade to 1.9.17 (after November 2017).

Restrict network access and do not expose the TestLink interface to the

Advisory URL:


SEC Consult Vulnerability Lab

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EOF T.Weber / @2018

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