TITLE:
Edimax BR-6104K UPnP Shell Command Injection Vulnerability

SECUNIA ADVISORY ID:
SA20169

VERIFY ADVISORY:
http://secunia.com/advisories/20169/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

OPERATING SYSTEM:
EDIMAX BR-6104K Broadband Router
http://secunia.com/product/10080/

DESCRIPTION:
Armijn Hemel has reported a vulnerability in Edimax BR-6104K, which
can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially compromise a vulnerable device.

The vulnerability is caused due to missing authentication of UPnP
AddPortMapping requests and missing validation of the
NewInternalClient parameter of the request. This can be exploited by
hosts on the local network to execute shell commands e.g.
"/sbin/reboot" on the device via specially crafted UPnP
AddPortMapping requests containing shell commands in the
NewInternalClient parameter.

SOLUTION:
Disable the UPnP functionality if it is not required.

UPnP is reportedly disabled by default.

PROVIDED AND/OR DISCOVERED BY:
Armijn Hemel

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