Date: Wed, 25 Aug 2010 09:45:50 +1000 From: Stephen Thorne <stephen@...rne.id.au> To: oss-security <oss-security@...ts.openwall.com> Cc: "Steven M. Christey" <coley@...us.mitre.org>, Amos Jeffries <amosjeffries@...id-cache.org>, Stephen Thorne <stephen@...rne.id.au> Subject: Re: CVE Request -- Squid v3.1.6 -- DoS (crash) while processing large DNS replies with no IPv6 resolver present On 2010-08-24, Jan Lieskovsky wrote: > Stephen Thorne reported a buffer overread flaw in the way Squid proxy caching server > processed large DNS replies in cases, when no IPv6 resolver was present. > A remote attacker could provide DNS reply with large amount of data, > leading to denial of service (squid server crash). Those references all look correct, but I have one small niggle, this was not a buffer overread flaw. What actually happens is that if a TCP DNS request is required, a logic error causes a sockopt to be set on the ipv6 resolver fd, which will be fatal if that resolver is not configured. -- Regards, Stephen Thorne Development Engineer Netbox Blue
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