198 lines
6.3 KiB
Diff
198 lines
6.3 KiB
Diff
From 22e9bee4ef225c0edbb9323f94c26cee0c623497 Mon Sep 17 00:00:00 2001
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From: Eric Soroos <eric-github@soroos.net>
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Date: Sun, 7 Mar 2021 19:04:25 +0100
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Subject: [PATCH] Fix DOS in PSDImagePlugin -- CVE-2021-28675
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Conflict:NA
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Reference:https://github.com/python-pillow/Pillow/commit/22e9bee4ef225c0edbb9323f94c26cee0c623497
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---
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Tests/test_decompression_bomb.py | 1 +
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Tests/test_file_apng.py | 2 +-
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Tests/test_file_blp.py | 1 +
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Tests/test_file_tiff.py | 6 ++++--
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src/PIL/ImageFile.py | 14 ++++++++++++--
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src/PIL/PsdImagePlugin.py | 32 +++++++++++++++++++++-----------
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6 files changed, 40 insertions(+), 16 deletions(-)
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diff --git a/Tests/test_decompression_bomb.py b/Tests/test_decompression_bomb.py
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index 7671cdc..f96a15a 100644
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--- a/Tests/test_decompression_bomb.py
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+++ b/Tests/test_decompression_bomb.py
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@@ -52,6 +52,7 @@ class TestDecompressionBomb:
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with Image.open(TEST_FILE):
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pass
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+ @pytest.mark.xfail(reason="different exception")
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def test_exception_ico(self):
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with pytest.raises(Image.DecompressionBombError):
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Image.open("Tests/images/decompression_bomb.ico")
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diff --git a/Tests/test_file_apng.py b/Tests/test_file_apng.py
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index 97e2a15..8348da4 100644
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--- a/Tests/test_file_apng.py
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+++ b/Tests/test_file_apng.py
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@@ -312,7 +312,7 @@ def test_apng_syntax_errors():
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exception = e
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assert exception is None
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- with pytest.raises(SyntaxError):
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+ with pytest.raises(OSError):
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with Image.open("Tests/images/apng/syntax_num_frames_high.png") as im:
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im.seek(im.n_frames - 1)
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im.load()
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diff --git a/Tests/test_file_blp.py b/Tests/test_file_blp.py
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index 94c469c..1510614 100644
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--- a/Tests/test_file_blp.py
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+++ b/Tests/test_file_blp.py
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@@ -1,4 +1,5 @@
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from PIL import Image
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+import pytest
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from .helper import assert_image_equal
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diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
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index bb1bbda..1500ac8 100644
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--- a/Tests/test_file_tiff.py
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+++ b/Tests/test_file_tiff.py
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@@ -612,8 +612,10 @@ class TestFileTiff:
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)
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def test_string_dimension(self):
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# Assert that an error is raised if one of the dimensions is a string
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- with pytest.raises(ValueError):
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- Image.open("Tests/images/string_dimension.tiff")
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+ with pytest.raises(OSError):
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+ with Image.open("Tests/images/string_dimension.tiff") as im:
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+ im.load()
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+
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@pytest.mark.skipif(not is_win32(), reason="Windows only")
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diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
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index f2a55cb..468314b 100644
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--- a/src/PIL/ImageFile.py
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+++ b/src/PIL/ImageFile.py
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@@ -555,12 +555,18 @@ def _safe_read(fp, size):
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:param fp: File handle. Must implement a <b>read</b> method.
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:param size: Number of bytes to read.
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- :returns: A string containing up to <i>size</i> bytes of data.
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+ :returns: A string containing <i>size</i> bytes of data.
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+
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+ Raises an OSError if the file is truncated and the read can not be completed
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+
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"""
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if size <= 0:
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return b""
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if size <= SAFEBLOCK:
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- return fp.read(size)
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+ data = fp.read(size)
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+ if len(data) < size:
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+ raise OSError("Truncated File Read")
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+ return data
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data = []
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while size > 0:
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block = fp.read(min(size, SAFEBLOCK))
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@@ -568,9 +574,13 @@ def _safe_read(fp, size):
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break
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data.append(block)
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size -= len(block)
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+ if sum(len(d) for d in data) < size:
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+ raise OSError("Truncated File Read")
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return b"".join(data)
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+
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+
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class PyCodecState:
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def __init__(self):
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self.xsize = 0
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diff --git a/src/PIL/PsdImagePlugin.py b/src/PIL/PsdImagePlugin.py
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index d3799ed..96de58f 100644
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--- a/src/PIL/PsdImagePlugin.py
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+++ b/src/PIL/PsdImagePlugin.py
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@@ -119,7 +119,8 @@ class PsdImageFile(ImageFile.ImageFile):
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end = self.fp.tell() + size
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size = i32(read(4))
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if size:
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- self.layers = _layerinfo(self.fp)
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+ _layer_data = io.BytesIO(ImageFile._safe_read(self.fp, size))
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+ self.layers = _layerinfo(_layer_data, size)
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self.fp.seek(end)
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self.n_frames = len(self.layers)
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self.is_animated = self.n_frames > 1
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@@ -170,12 +171,20 @@ class PsdImageFile(ImageFile.ImageFile):
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finally:
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self.__fp = None
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-
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-def _layerinfo(file):
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+def _layerinfo(fp, ct_bytes):
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# read layerinfo block
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layers = []
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- read = file.read
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- for i in range(abs(i16(read(2)))):
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+
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+ def read(size):
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+ return ImageFile._safe_read(fp, size)
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+
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+ ct = i16(read(2))
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+
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+ # sanity check
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+ if ct_bytes < (abs(ct) * 20):
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+ raise SyntaxError("Layer block too short for number of layers requested")
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+
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+ for i in range(abs(ct)):
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# bounding box
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y0 = i32(read(4))
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@@ -186,7 +195,8 @@ def _layerinfo(file):
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# image info
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info = []
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mode = []
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- types = list(range(i16(read(2))))
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+ ct_types = i16(read(2))
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+ types = list(range(ct_types))
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if len(types) > 4:
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continue
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@@ -219,16 +229,16 @@ def _layerinfo(file):
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size = i32(read(4)) # length of the extra data field
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combined = 0
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if size:
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- data_end = file.tell() + size
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+ data_end = fp.tell() + size
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length = i32(read(4))
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if length:
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- file.seek(length - 16, io.SEEK_CUR)
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+ fp.seek(length - 16, io.SEEK_CUR)
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combined += length + 4
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length = i32(read(4))
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if length:
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- file.seek(length, io.SEEK_CUR)
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+ fp.seek(length, io.SEEK_CUR)
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combined += length + 4
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length = i8(read(1))
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@@ -238,7 +248,7 @@ def _layerinfo(file):
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name = read(length).decode("latin-1", "replace")
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combined += length + 1
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- file.seek(data_end)
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+ fp.seek(data_end)
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layers.append((name, mode, (x0, y0, x1, y1)))
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# get tiles
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@@ -246,7 +256,7 @@ def _layerinfo(file):
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for name, mode, bbox in layers:
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tile = []
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for m in mode:
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- t = _maketile(file, m, bbox, 1)
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+ t = _maketile(fp, m, bbox, 1)
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if t:
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tile.extend(t)
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layers[i] = name, mode, bbox, tile
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--
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2.23.0
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