mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-11-14 05:36:48 +03:00
c69dcc1c29
- Include CVE link in title (via @hugovk) - Retro-add release notes for 2.3.2, 2.5.2 for CVE-2014-3589
48 lines
1.2 KiB
ReStructuredText
48 lines
1.2 KiB
ReStructuredText
3.1.2
|
|
-----
|
|
|
|
Security
|
|
========
|
|
|
|
:cve:`2016-3076`: Buffer overflow in Jpeg2KEncode.c
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Pillow between 2.5.0 and 3.1.1 may overflow a buffer
|
|
when writing large Jpeg2000 files, allowing for code execution or other
|
|
memory corruption.
|
|
|
|
This occurs specifically in the function ``j2k_encode_entry``, at the line:
|
|
|
|
.. code-block:: c
|
|
|
|
state->buffer = malloc (tile_width * tile_height * components * prec / 8);
|
|
|
|
|
|
This vulnerability requires a particular value for ``height * width``
|
|
such that ``height * width * components * precision`` overflows, at
|
|
which point the malloc will be for a smaller value than expected. The
|
|
buffer that is allocated will be ``((height * width * components *
|
|
precision) mod (2^31) / 8)``, where components is 1-4 and precision is
|
|
either 8 or
|
|
16. Common values would be 4 components at precision 8 for a standard
|
|
``RGBA`` image.
|
|
|
|
The unpackers then split an image that is laid out::
|
|
|
|
RGBARGBARGBA....
|
|
|
|
into::
|
|
|
|
|
|
RRR.
|
|
GGG.
|
|
BBB.
|
|
AAA.
|
|
|
|
|
|
If this buffer is smaller than expected, the jpeg2k unpacker functions
|
|
will write outside the allocation and onto the heap, corrupting
|
|
memory.
|
|
|
|
This issue was found by Alyssa Besseling at Atlassian.
|