Date: Mon, 28 Oct 2013 19:17:51 +0100 From: Nicolas Grégoire <nicolas.gregoire@...rri.fr> To: oss-security@...ts.openwall.com Subject: Re: CVE Request: libxml2 external parsed entities issue >>libxml2 earlier than 2.9.0 fetches external parsed entities by >>default, with no way to disable the behaviour. >> >>Fixed by the following commit: >>https://git.gnome.org/browse/libxml2/commit/?id=4629ee02ac649c27f9c0cf98ba017c6b5526070f [...] > Hrm, I would have thought CVE-2013-0339 was for the entities expansion DoS issue > fixed by this commit: > > https://git.gnome.org/browse/libxml2/commit/?id=23f05e0c33987d6605387b300c4be5da2120a7ab > > The other one is for external entities expansion being enabled by default with > no way to turn it off. You would lump them together? It's still unclear to me what exactly CVE-2013-0339 covers. Patch for the entity expansion DoS: https://git.gnome.org/browse/libxml2/commit/?id=23f05e0c33987d6605387b300c4be5da2120a7ab Patch for not expanding external entities by default: https://git.gnome.org/browse/libxml2/commit/?id=4629ee02ac649c27f9c0cf98ba017c6b5526070f Are both patches covered? The second one is quite important as it kills the classic XXE vector <!ENTITY foo SYSTEM "/etc/passwd"> For Ubuntu, CVE-2013-0339 covers the XXE attack. https://bugs.launchpad.net/ubuntu/%2Bsource/libxml2/%2Bbug/1194410 For Debian, it's "large memory consumption" only: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702260 For RedHat, it covers both but "libxml2 already provides mechanisms to disable external entities which applications can use. Closing this flaw as 'wontfix'": https://bugzilla.redhat.com/show_bug.cgi?id=915149 And the official page for the CVE isn't helpful: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0339 Regards, Nicolas Grégoire
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