oss-sec mailing list archives
Re: CVE Request: libxml2 external parsed entities issue
From: Nicolas Grégoire <nicolas.gregoire () agarri fr>
Date: Mon, 28 Oct 2013 19:17:51 +0100
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
Current thread:
- Re: CVE Request: libxml2 external parsed entities issue Nicolas Grégoire (Oct 28)
- Re: CVE Request: libxml2 external parsed entities issue Huzaifa Sidhpurwala (Oct 28)
- Re: CVE Request: libxml2 external parsed entities issue Nicolas Grégoire (Oct 29)
- Re: CVE Request: libxml2 external parsed entities issue Kurt Seifried (Oct 29)
- Re: CVE Request: libxml2 external parsed entities issue Nicolas Grégoire (Oct 29)
- Re: CVE Request: libxml2 external parsed entities issue Huzaifa Sidhpurwala (Oct 28)