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Bug 573958 (CVE-2016-0740) - <dev-python/pillow-3.1.1 - Buffer overflow in TiffDecode.c (CVE-2016-{0740,0775})
Summary: <dev-python/pillow-3.1.1 - Buffer overflow in TiffDecode.c (CVE-2016-{0740,07...
Alias: CVE-2016-0740
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: B2 [glsa cleanup]
Depends on: CVE-2016-9190
  Show dependency tree
Reported: 2016-02-05 19:33 UTC by Justin Lecher (RETIRED)
Modified: 2016-12-31 14:26 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Justin Lecher (RETIRED) gentoo-dev 2016-02-05 19:33:18 UTC

CVE-2016-0740 -- Buffer overflow in TiffDecode.c

Pillow 3.1.0 and earlier when linked against libtiff >= 4.0.0 on x64
may overflow a buffer when reading a specially crafted tiff file.

Specifically, libtiff >= 4.0.0 changed the return type of
``TIFFScanlineSize`` from ``int32`` to machine dependent
``int32|64``. If the scanline is sized so that it overflows an
``int32``, it may be interpreted as a negative number, which will then
pass the size check in ``TiffDecode.c`` line 236. To do this, the
logical scanline size has to be > 2gb, and for the test file, the
allocated buffer size is 64k against a roughly 4gb scan line size. Any
image data over 64k is written over the heap, causing a segfault.

This issue was found by security researcher FourOne.

CVE-2016-0775 -- Buffer overflow in FliDecode.c

In all versions of Pillow, dating back at least to the last PIL 1.1.7
release, FliDecode.c has a buffer overflow error.

Around line 192::

  case 16:
      /* COPY chunk */
      for (y = 0; y < state->ysize; y++) {
          UINT8* buf = (UINT8*) im->image[y];
          memcpy(buf+x, data, state->xsize);
          data += state->xsize;

The memcpy has error where ``x`` is added to the target buffer
address. ``X`` is used in several internal temporary variable roles,
but can take a value up to the width of the image.  ``Im->image[y]``
is a set of row pointers to segments of memory that are the size of
the row.  At the max ``y``, this will write the contents of the line
off the end of the memory buffer, causing a segfault.

This issue was found by Alyssa Besseling at Atlassian

CVE-2016-TBD -- Buffer overflow in PcdDecode.c

In all versions of Pillow, dating back at least to the last PIL 1.1.7
release, ``PcdDecode.c`` has a buffer overflow error.

The ``state.buffer`` for ``PcdDecode.c`` is allocated based on a 3
bytes per pixel sizing, where ``PcdDecode.c`` wrote into the buffer
assuming 4 bytes per pixel. This writes 768 bytes beyond the end of
the buffer into other Python object storage. In some cases, this
causes a segfault, in others an internal Python malloc error.

Integer overflow in Resample.c

If a large value was passed into the new size for an image, it is
possible to overflow an int32 value passed into malloc.
  kk = malloc(xsize * kmax * sizeof(float));
  xbounds = malloc(xsize * 2 * sizeof(int));

``xsize`` is trusted user input. These multiplications can overflow,
leading the malloc'd buffer to be undersized. These allocations are
followed by a loop that writes out of bounds. This can lead to
corruption on the heap of the Python process with attacker controlled
float data.

This issue was found by Ned Williamson.
Comment 1 Justin Lecher (RETIRED) gentoo-dev 2016-02-05 19:44:49 UTC
@arhces, please stabilize pillow-3.1.1
Comment 2 Jeroen Roovers (RETIRED) gentoo-dev 2016-02-06 08:08:55 UTC
Stable for HPPA.
Comment 3 Jeroen Roovers (RETIRED) gentoo-dev 2016-02-06 16:11:51 UTC
Stable for PPC64.
Comment 4 Tobias Klausmann (RETIRED) gentoo-dev 2016-02-09 13:08:13 UTC
Stable on alpha.
Comment 5 Agostino Sarubbo gentoo-dev 2016-02-11 12:28:24 UTC
amd64 stable
Comment 6 Markus Meier gentoo-dev 2016-02-14 17:27:20 UTC
arm stable
Comment 7 Agostino Sarubbo gentoo-dev 2016-03-15 16:39:52 UTC
x86 stable
Comment 8 Agostino Sarubbo gentoo-dev 2016-03-16 12:06:33 UTC
ppc stable
Comment 9 Agostino Sarubbo gentoo-dev 2016-03-19 11:36:25 UTC
sparc stable
Comment 10 Agostino Sarubbo gentoo-dev 2016-03-20 12:00:58 UTC
ia64 stable.

Maintainer(s), please cleanup.
Security, please add it to the existing request, or file a new one.
Comment 11 Aaron Bauman (RETIRED) gentoo-dev 2016-11-11 07:13:08 UTC
@maintainer(s), please cleanup the vulnerable versions.
Comment 12 GLSAMaker/CVETool Bot gentoo-dev 2016-12-31 14:26:00 UTC
This issue was resolved and addressed in
 GLSA 201612-52 at
by GLSA coordinator Thomas Deutschmann (whissi).