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[R1] Trend Micro Smart Protection Server Denial of Service

High

Synopsis

While investigating CVE-2017-11398, Tenable found a new denial of service vector in Trend Micro Smart Protection Server (TMSPS). The vulnerability allows an unauthenticated remote attacker to create "BF" files on the target by sending crafted HTTP requests to http://<target>/tmcss/. The created "BF" file has a name in the form of incdiff_<older_version>_<version> and is stored in /var/tmcss/pattern/<version>. Each file is approximately 17 MB. An attacker can fill the remote target's disk by sending a large number of HTTP requests with different <older_version> parameters.

The following curl command serves as a proof of concept:

curl -so /tmp/incdiff_1712200300_1812200300  'http://<tmsps_host>/tmcss/?OldBF=1712200300&NewBF=1812200300'

On our test host the proof of concept generates the following file in /var/tmcss/patterns/1812200300/:

[[email protected] 1812200300]# ls -l incdiff*
-rw-r-----. 1 webserv webserv 17825852 Mar  2 00:18 incdiff_1712200300.1812200300

Solution

Patches have been released for Trend Micro Smart Protection Server versions 3.0-3.3. For more information see Trend Micro's advisory.

Disclosure Timeline

03-03-2018 - Vulnerability discovered
03-05-2018 - Vulnerability reported to [email protected]
03-05-2018 - Trend Micro replies with an automated response
03-06-2018 - Trend Micro disputes the vulnerability. Suggests the vulnerability as described isn't possible.
03-06-2018 - Tenable explains further why the vulnerability is real
03-07-2018 - Trend Micro indicates the details are being sent to development
03-28-2018 - Tenable checks in with Trend Micro
03-30-2018 - Trend Micro says the fix is still in development
05-02-2018 - Trend Micro releases an advisory

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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