Full Disclosure mailing list archives
RE: Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover
From: lee.e.rian () census gov
Date: Wed, 23 Jul 2003 13:43:02 -0400
On July 22 Curt Purdy <purdy () tecman com> said
If the packet expires in transit i.e. ttl 1 to router 2 hops away means
it
never gets to that router. Not possible to fill a queue with a packet
that
is dropped by the previous router.
Someone said that having the TTL of an evil packet expire on a vulnerable router was enough to cause the problem. The reasoning made sense - the TTL expires so the packet gets bumped up to process level, put on the input queue and never comes off. But I haven't been able to duplicate that and was wondering if it was a bogus report or my testing was ummm... less that perfect. So... has anyone been able to verify that the problem occurs when the TTL expires without the packet being addressed to the router? Or is it a requirement that the evil packet be addressed to the router? Regards, Lee _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover lee . e . rian (Jul 21)
- RE: Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover Curt Purdy (Jul 22)
- <Possible follow-ups>
- Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover Shawn Bernard (Jul 22)
- RE: Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover lee . e . rian (Jul 23)
- RE: Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover Cedric Blancher (Jul 24)
- Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover Richard Johnson (Jul 24)
- RE: Re: Cisco IOS Denial of Service that affects most Cisco IOS routers- requires power cycle to recover Cedric Blancher (Jul 24)