VAR-200605-0267
Vulnerability from variot - Updated: 2025-04-03 22:16Edimax BR-6104K router allows remote attackers to bypass access restrictions and conduct unauthorized operations via a UPnP request with a modified InternalClient parameter (possibly within NewInternalClient), which is not validated, as demonstrated by using AddPortMapping to forward arbitrary traffic. For example, use AddPortMapping to forward arbitrary traffic. Br 6104K is prone to a security bypass vulnerability.
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
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/secunia_security_advisories/
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