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Re: CVE Request: libtiff: Heap-buffer overflow when processing a TIFF image with PixarLog Compression
From: Kurt Seifried <kseifried () redhat com>
Date: Tue, 25 Sep 2012 10:56:02 -0600

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On 09/25/2012 03:06 AM, Huzaifa Sidhpurwala wrote:
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!


Please use CVE-2012-4447 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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