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Message-ID: <87y6bp7ekl.fsf@mid.deneb.enyo.de>
Date: Sun, 29 Aug 2010 15:07:06 +0200
From: Florian Weimer <fw@...eb.enyo.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request: BGP protocol vulnerability
* Kurt Seifried:
>> The BGP protocol and its various extensions require that BGP peering
>> sessions are terminated when a peer receives a BGP update message
>> which it considers semantically incorrect, leading to a persistent
>> denial-of-service condition if the update is received again after the
>> terminated session is reestablished.
>>
>> (This is not something new at all---we just need to get up, treat it
>> as a vulnerability, and fix it.)
>
> This sounds like CVE-2010-3035
> http://www.cisco.com/warp/public/707/cisco-sa-20100827-bgp.shtml
In this context, I don't like that the peer on the receiving end
resets the session. It's got a significant impact on availability,
and the resulting UPDATE churn hurts everybody a little bit.
In short, I think there are two bugs: IOS XR producing bad data, and
other implementations dealing badly with it.
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