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Date: Wed, 03 Apr 2013 17:07:58 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request: glibc getaddrinfo() stack overflow
On 04/03/2013 04:55 PM, Sebastian Krahmer wrote:
> glibc resolver surprisingly seems to accept indeed larger
> UDP packets than DNS servers would send without EDNS0.
> But depending on setup its probably hard to get such large
> packets through your local recursive DNS, not to speak
> about the firewall. Maybe its possible to signal truncation
> and force a TCP connect?
Yes, this is with the TCP transport. With a suitably prepared zone, I
can get up to
$ getent hosts ... | wc -l
4093
A records (over DNS, just to be clear).
--
Florian Weimer / Red Hat Product Security Team
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