Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
BID:1010
Info
Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
| Bugtraq ID: | 1010 |
| Class: | Failure to Handle Exceptional Conditions |
| CVE: | |
| Remote: | Yes |
| Local: | No |
| Published: | Feb 25 2000 12:00AM |
| Updated: | Feb 25 2000 12:00AM |
| Credit: | The first 4 vulnerabilities were posted to the Bugtraq mailing list by Swift Griggs <[email protected]> on February 25, 2000. The second 3 were sent by Mike Wade <[email protected]> to the Bugtraq mailing list on February 25, 2000. |
| Vulnerable: |
Nortel Networks Netgear ISDN 348.0 RH Nortel Networks Netgear ISDN 328.0 RT |
| Not Vulnerable: | |
Discussion
Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
A number of vulnerabilities exist in the Netgear ISDN RH348 and RT328 routers, made by Nortel networks. These vulnerabilities can result in the denial of traffic flowing through the router, as well as prevent effective management of the router.
Denial of Service 1: It has been reported that SYN scanning the router, using a tool like NMAP, will render telnet connectivity to these routers nonexistent.
Denial of Service 2: Establishing a telnet connection to the router will prevent any other connections from taking place, regardless of whether or not the connecting user has authenticated.
Denial of Service 3: Sending a flood of ICMP redirects will cause the router to stop routing packets. It will take approximately 30 seconds for the router to recover, once the flood has stopped.
Denial of Service 4: The router will accept and apply RIP packets originating on both interfaces. This allows an attacker to cause packets to no longer route correctly, or possibly route traffic through another machine.
Denial of Service 5: Sending a single UDP packet of between 63000 and 65000 bytes will cause the router to stop routing packets for up to 30 seconds.
Denial of Service 6: Certain types of legitimate traffic behave poorly when running NAT. These services include things like IRC DCC and Real Audio/Video.
Denial of Service 7: Traffic is often dropped in NAT mode when the router has been connected for over 12 hours. Active connections will not be dropped, but new connections can not be established.
A number of vulnerabilities exist in the Netgear ISDN RH348 and RT328 routers, made by Nortel networks. These vulnerabilities can result in the denial of traffic flowing through the router, as well as prevent effective management of the router.
Denial of Service 1: It has been reported that SYN scanning the router, using a tool like NMAP, will render telnet connectivity to these routers nonexistent.
Denial of Service 2: Establishing a telnet connection to the router will prevent any other connections from taking place, regardless of whether or not the connecting user has authenticated.
Denial of Service 3: Sending a flood of ICMP redirects will cause the router to stop routing packets. It will take approximately 30 seconds for the router to recover, once the flood has stopped.
Denial of Service 4: The router will accept and apply RIP packets originating on both interfaces. This allows an attacker to cause packets to no longer route correctly, or possibly route traffic through another machine.
Denial of Service 5: Sending a single UDP packet of between 63000 and 65000 bytes will cause the router to stop routing packets for up to 30 seconds.
Denial of Service 6: Certain types of legitimate traffic behave poorly when running NAT. These services include things like IRC DCC and Real Audio/Video.
Denial of Service 7: Traffic is often dropped in NAT mode when the router has been connected for over 12 hours. Active connections will not be dropped, but new connections can not be established.
Exploit / POC
Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
Solution / Fix
Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
Solution:
Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
The Netgear routers can have ACL's applied to them. Applying ACL's to deny access to all ports on the router, except those explicitly allowed will help remove some of these problems. It should also be possible to disable RIP.
Solution:
Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].
The Netgear routers can have ACL's applied to them. Applying ACL's to deny access to all ports on the router, except those explicitly allowed will help remove some of these problems. It should also be possible to disable RIP.
References
Nortel Netgear ISDN RH348 and RT328 Denial Of Service Vulnerabilities
References:
References: