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Message-ID: <50617418.5010308@redhat.com>
Date: Tue, 25 Sep 2012 14:36:32 +0530
From: Huzaifa Sidhpurwala <huzaifas@...hat.com>
To: oss-security@...ts.openwall.com, Kurt Seifried <kseifried@...hat.com>
Subject: CVE Request: libtiff: Heap-buffer overflow when processing a TIFF
image with PixarLog Compression
On 09/23/2012 08:29 AM, Solar Designer wrote:
> "libtiff 4.0.3 brings "various memory buffer access fixes". Does it fix
> more than CVE-2012-3401?"
>
> to which I have no answer. The change log does in fact mention
> "Various memory buffer access fixes." as the very first change listed
> for libtiff. Perhaps someone should review code changes.
>
I had a look at the libtiff-4.0.3 commit logs and found one issue which
seems to bring a possibility of heap-based buffer overflow when using a
tiff file with PixarLog compression format.
More details at:
https://bugzilla.redhat.com/show_bug.cgi?id=860198
Though memory overwrite outside the heap-buffer is only a few bytes, one
cannot really overwrite possible arbitrary code execution.
Can a CVE id be please assigned to the above flaw?
Found two other commits which seemed interesting, but i dont think
they could cause arbitrary code execution and i dont want to call
them security flaws.
1. OOB read crash tif_packbits.c
2. Memory not properly initialised in tif_fax3.c. Again this one was
partly fixed in 4.0.2 and completely fixed in 4.0.3
If anyone else wants to investigate these in more details, please be my
guest :)
Thanks!
--
Huzaifa Sidhpurwala / Red Hat Security Response Team
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