oss-security - Re: GHOST gethostbyname() heap overflow in glibc (CVE-2015-0235)

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Message-ID: <87oapia86q.fsf@mid.deneb.enyo.de>
Date: Wed, 28 Jan 2015 22:47:57 +0100
From: Florian Weimer <fw@...eb.enyo.de>
To: oss-security@...ts.openwall.com
Subject: Re: GHOST gethostbyname() heap overflow in glibc (CVE-2015-0235)

> On Wed, 28 Jan 2015, Huzaifa Sidhpurwala wrote:
>
>> On 01/27/2015 11:35 PM, Florian Weimer wrote:
>>> * Marek Kroemeke:
>>>
>>>> We just noticed CVE-2015-0235 , and we thought we will drop this one
>>>> in - apologies for low quality , we didn't really have time yet to
>>>> analyse it, but it seems to be related, so it makes sense to patch
>>>> things once right ?
>>>
>>> It's not related, and we cannot patch it at the same time because
>>> packages for the gethostbyname issue are already ready, they just have
>>> to be released.  (When we change critical system components, we also
>>> need to be extra-careful with testing, which takes time.)
>>>
>>> Andreas Schwab fixed this in 2011:
>>>
>>>   <https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=2e96f1c7>
>>>
>>> If I'm not mistaken, this commit when into glibc 2.15.
>>>
>>> I have not yet found the corresponding glibc bug (if it exists).
>>>
>>> The bug only materializes if the getaddrinfo functions is called with
>>> the AI_IDN flag, and if glibc has been compiled with libidn support
>>> (but I haven't checked if you can switch that off these days).
>>>
>>
>> MITRE,
>>
>> This is a new flaw, can you please assign a CVE id to this?
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=797096
>>
>> Thanks!
>>
>> -- 
>> Huzaifa Sidhpurwala / Red Hat Product Security Team
>
> Use CVE-2012-6686 for "unbound alloca use in glob_in_dir" as covered
> by Red Hat Bugzilla ID 797096.

Oh, it seems Huzaifa posted the wrong Bugzilla reference.

We still need assignment for this fix:

  <https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=2e96f1c7>

The matching Red Hat Bugzilla bug is:

  <https://bugzilla.redhat.com/show_bug.cgi?id=981942>

I haven't yet seen an upstream bug for it; this change happened before
upstream required bugs being filed for all user-visible changes.

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