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python3-pillow: Fix CVE-2023-50447

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Pillow through 10.1.0 allows PIL.ImageMath.eval Arbitrary Code
Execution via the environment parameter, a different vulnerability
than CVE-2022-22817 (which was about the expression parameter).

References:
https://security-tracker.debian.org/tracker/CVE-2023-50447
https://github.com/python-pillow/Pillow/blob/10.2.0/CHANGES.rst

Signed-off-by: Rahul Janani Pandi <RahulJanani.Pandi@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
This commit is contained in:
Rahul Janani Pandi
2024-04-08 09:42:28 +00:00
committed by Armin Kuster
parent 0fffd4d422
commit 717462f811
5 changed files with 186 additions and 0 deletions
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56
meta-python/recipes-devtools/python/python3-pillow/CVE-2023-50447-3.patch Normal file
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@@ -0,0 +1,56 @@
From 0ca3c33c59927e1c7e0c14dbc1eea1dfb2431a80
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Sat, 28 Oct 2023 15:58:52 +1100
Subject: [PATCH] python3-pillow: Allow ops
CVE: CVE-2023-50447
Upstream-Status: Backport [https://github.com/python-pillow/Pillow/commit/0ca3c33c59927e1c7e0c14dbc1eea1dfb2431a80]
Signed-off-by: Rahul Janani Pandi <RahulJanani.Pandi@windriver.com>
---
Tests/test_imagemath.py | 5 +++++
src/PIL/ImageMath.py | 9 +++++----
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/Tests/test_imagemath.py b/Tests/test_imagemath.py
index fe7ac9a7a..ded8c0011 100644
--- a/Tests/test_imagemath.py
+++ b/Tests/test_imagemath.py
@@ -63,6 +63,11 @@ def test_prevent_exec(expression):
ImageMath.eval(expression)
+def test_prevent_double_underscores():
+ with pytest.raises(ValueError):
+ ImageMath.eval("1", {"__": None})
+
+
def test_logical():
assert pixel(ImageMath.eval("not A", images)) == 0
assert pixel(ImageMath.eval("A and B", images)) == "L 2"
diff --git a/src/PIL/ImageMath.py b/src/PIL/ImageMath.py
index 923a8eeae..c14598a4c 100644
--- a/src/PIL/ImageMath.py
+++ b/src/PIL/ImageMath.py
@@ -237,13 +237,14 @@ def eval(expression, _dict={}, **kw):
# build execution namespace
args = ops.copy()
- args.update(_dict)
- args.update(kw)
- for k, v in args.items():
- if '__' in k or hasattr(__builtins__, k):
+ for k in list(_dict.keys()) + list(kw.keys()):
+ if "__" in k or hasattr(__builtins__, k):
msg = f"'{k}' not allowed"
raise ValueError(msg)
+ args.update(_dict)
+ args.update(kw)
+ for k, v in args.items():
if hasattr(v, "im"):
args[k] = _Operand(v)
--
2.40.0