Date: Sat, 26 May 2018 06:53:09 -0700 From: Bryan Pendleton <bpendleton.derby@...il.com> To: Tomas Hoger <thoger@...hat.com> Cc: oss-security@...ts.openwall.com, security <security@...che.org>, gregory draperi <gregory.draperi@...il.com> Subject: Re: [ANNOUNCE] CVE-2018-1313: Apache Derby externally-controlled input vulnerability Yes, Tomas, that is a very good point; I agree completely. Thank you for the follow-ups and discussion! bryan On Mon, May 21, 2018 at 5:57 AM, Tomas Hoger <thoger@...hat.com> wrote: > On Mon, 14 May 2018 21:04:58 -0700 Bryan Pendleton wrote: > >> Hi Tomas, thank you for getting in touch, and for the excellent questions. >> >> I think the problem here is primarily my lack of skill in clearly writing >> disclosure information about vulnerabilities, so let me try to do my best >> to clarify. >> >> Indeed, allowing the Derby server to open an untrusted database is >> of serious concern, and, due to Derby's rich extensibility features, can >> allow the execution of arbitrary *Java* code directly in Derby. So this >> is an important concern. >> >> And yes, you are correct that the selection of 10.3.1.4 as the first >> affected release is because the default security policy dates from >> that release, and you are also correct that the "ping with arguments" >> pre-dates that. We certainly hope that nobody is running such 11-year-old >> software any more; if possible, we would really like them to upgrade. >> >> Regarding the question of which fix is the "actual security fix," I find >> this a challenging question. In order to exploit the vulnerability, the >> ping command must allow the specially crafted request packet, *and* >> the security policy must allow the access to the untrusted database. >> Closing *either* of those holes is enough to prevent that exploit; we chose >> to close *both* of them with the 10.14.2.0 release. >> >> The Derby development team's primary recommendation is that >> any Derby Network Server deployed in a production environment >> should use an explicitly-developed custom security policy, and not >> depend on the default policy; still, the new security policy that is >> installed by default by 10.14.2.0 is considerably more secure than >> the policy that was previously in place. >> >> I hope this helps. If I have misunderstood the intent of any of your >> questions, please let me know. > > Thank you for your detailed reply. It addresses my questions. > > FWIW, in this case, the change of the ping command handling is what I'd > view as the security fix. The change of the default security policy > would not be sufficient in deployments where custom security policy is > used and that policy is less restrictive than the new default policy > (even though it's maybe more restrictive than the old default). > > -- > Tomas Hoger / Red Hat Product Security
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