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Edimax BR-6104K UPnP Shell Command Injection Vulnerability
Secunia Advisory: SA20169
Release Date: 2006-05-22
Last Update: 2006-05-26
Popularity: 6,998 views

Critical:
Moderately critical
Impact: DoS
System access
Where: From local network
Solution Status: Unpatched

OS:EDIMAX BR-6104K Broadband Router

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CVE reference:CVE-2006-2561


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

Changelog:
2006-05-26: Added CVE reference.


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