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Message-ID: <4F68BC00.9010301@redhat.com>
Date: Tue, 20 Mar 2012 11:18:56 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Jan Lieskovsky <jlieskov@...hat.com>
Subject: Re: Re: Bugs in "file" program VU#621745
On 03/20/2012 11:11 AM, Jan Lieskovsky wrote:
>
> Hi Kurt, vendors,
>
>> Date: Wed, 29 Feb 2012 16:54:49 -0500 (EST)
>> From: Kurt Seifried <kseifrie@...hat.com>
>> To: oss-security@...ts.openwall.com
>> Cc: Florian Weimer <fw@...eb.enyo.de>
>> Subject: Re: Bugs in "file" program VU#621745
>>
>> On 02/29/2012 10:52 AM, Florian Weimer wrote:
>>> * Kurt Seifried:
>>>
>>>>> We recently pointed the CERT BFF at the ubiquitous "file" command
>>>>> and found a few bugs. While we've not proven the bugs to be
>>>>> exploitable, we've also not ruled out the possibility that they
>>>>> could be.
>>>>>
>>>>> Fixes were committed on Feb 16, 2012:
>>>>> https://github.com/glensc/file/commits/master
>>>
>>>> If any of these are security issues please let me know and I will
>>>> assign CVE #'s.
>>>
>>> file also provides a library, libmagic. This could lead to crashes of
>>> server processes which use libmagic. Debian will likely release a fix
>>> as a security update.
>>
>> Fair enough but I'd like some details before issuing CVE's, like what
>> are the actual security issues that have been fixed?
>
> Based on further investigation, I am able to tell the issues here
> are out-of heap-based buffer reads and / or invalid pointer dereferences
> by processing various parts of CDF (Composite Document Files) header.
>
> Out-of heap-based buffer reads:
> i) either by attempt to access field at invalid index,
> ii) or by attempt to access field out of allocated array bounds.
>
> Invalid pointer dereferences:
> iii) by attempt to access pointer value, being modified in
> a for loop cycle.
>
> Anyway, the file executable is terminated in each case yet by attempt
> to read the location, thus these seem to be able to cause just file
> executable crashes.
>
> Relevant Red Hat Bugzilla record is here:
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=805197
>
> Though issues having lower impact, would it be possible to allocate
> one CVE identifier to these? (one should be enough, since the reason
> is always the same and the underlying code is parsing CDF file header).
>
> Thank you && Regards, Jan.
> --
> Jan iankko Lieskovsky / Red Hat Security Response Team
Please use CVE-2012-1571 for these issues.
--
Kurt Seifried Red Hat Security Response Team (SRT)
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