[Adding [email protected] to CC]
Chris Lamb wrote:
> retitle 922027 CVE-2019-6975: Memory exhaustion in
> django.utils.numberformat.format()
> severity 922027 grave
> found 922027 1:1.10.7-2+deb9u3
> tags 922027 + security
> thanks
Security team, may I upload this to stretch-security? Diff attached.
Regards,
--
,''`.
: :' : Chris Lamb
`. `'` [email protected] 🍥 chris-lamb.co.uk
`-
diff --git a/debian/changelog b/debian/changelog
index fa89c8b21..55d1fc21b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+python-django (1:1.10.7-2+deb9u5) stretch-security; urgency=high
+
+ * CVE-2019-6975: Fix memory exhaustion in utils.numberformat.format().
+ (Closes: #922027)
+
+ -- Chris Lamb <[email protected]> Mon, 11 Feb 2019 15:01:30 +0100
+
python-django (1:1.10.7-2+deb9u4) stretch-security; urgency=high
* CVE-2019-3498: Prevent a content-spoofing vulnerability in the default
diff --git a/debian/patches/0019-CVE-2019-6795.patch
b/debian/patches/0019-CVE-2019-6795.patch
new file mode 100644
index 000000000..39c2f864c
--- /dev/null
+++ b/debian/patches/0019-CVE-2019-6795.patch
@@ -0,0 +1,69 @@
+From: Carlton Gibson <[email protected]>
+Date: Mon, 11 Feb 2019 11:15:45 +0100
+Subject: Fixed CVE-2019-6975 -- Fixed memory exhaustion in
+ utils.numberformat.format().
+
+Thanks Sjoerd Job Postmus for the report and initial patch.
+Thanks Michael Manfre, Tim Graham, and Florian Apolloner for review.
+
+Backport of 402c0caa851e265410fbcaa55318f22d2bf22ee2 from master.
+---
+ django/utils/numberformat.py | 15 ++++++++++++++-
+ tests/utils_tests/test_numberformat.py | 18 ++++++++++++++++++
+ 2 files changed, 32 insertions(+), 1 deletion(-)
+
+diff --git a/django/utils/numberformat.py b/django/utils/numberformat.py
+index 6667d82..8b4d228 100644
+--- a/django/utils/numberformat.py
++++ b/django/utils/numberformat.py
+@@ -27,7 +27,20 @@ def format(number, decimal_sep, decimal_pos=None,
grouping=0, thousand_sep='',
+ # sign
+ sign = ''
+ if isinstance(number, Decimal):
+- str_number = '{:f}'.format(number)
++ # Format values with more than 200 digits (an arbitrary cutoff) using
++ # scientific notation to avoid high memory usage in {:f}'.format().
++ _, digits, exponent = number.as_tuple()
++ if abs(exponent) + len(digits) > 200:
++ number = '{:e}'.format(number)
++ coefficient, exponent = number.split('e')
++ # Format the coefficient.
++ coefficient = format(
++ coefficient, decimal_sep, decimal_pos, grouping,
++ thousand_sep, force_grouping,
++ )
++ return '{}e{}'.format(coefficient, exponent)
++ else:
++ str_number = '{:f}'.format(number)
+ else:
+ str_number = six.text_type(number)
+ if str_number[0] == '-':
+diff --git a/tests/utils_tests/test_numberformat.py
b/tests/utils_tests/test_numberformat.py
+index 3dd1b06..769406c 100644
+--- a/tests/utils_tests/test_numberformat.py
++++ b/tests/utils_tests/test_numberformat.py
+@@ -60,6 +60,24 @@ class TestNumberFormat(TestCase):
+ self.assertEqual(nformat(Decimal('1234'), '.', grouping=2,
thousand_sep=',', force_grouping=True), '12,34')
+ self.assertEqual(nformat(Decimal('-1234.33'), '.', decimal_pos=1),
'-1234.3')
+ self.assertEqual(nformat(Decimal('0.00000001'), '.', decimal_pos=8),
'0.00000001')
++ # Very large & small numbers.
++ tests = [
++ ('9e9999', None, '9e+9999'),
++ ('9e9999', 3, '9.000e+9999'),
++ ('9e201', None, '9e+201'),
++ ('9e200', None, '9e+200'),
++ ('1.2345e999', 2, '1.23e+999'),
++ ('9e-999', None, '9e-999'),
++ ('1e-7', 8, '0.00000010'),
++ ('1e-8', 8, '0.00000001'),
++ ('1e-9', 8, '0.00000000'),
++ ('1e-10', 8, '0.00000000'),
++ ('1e-11', 8, '0.00000000'),
++ ('1' + ('0' * 300), 3, '1.000e+300'),
++ ('0.{}1234'.format('0' * 299), 3, '1.234e-300'),
++ ]
++ for value, decimal_pos, expected_value in tests:
++ self.assertEqual(nformat(Decimal(value), '.', decimal_pos),
expected_value)
+
+ def test_decimal_subclass(self):
+ class EuroDecimal(Decimal):
diff --git a/debian/patches/series b/debian/patches/series
index 5bda383eb..ad6685673 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -9,3 +9,4 @@ fix-test-middleware-classes-headers.patch
0016-CVE-2017-12794.patch
0006-Default-to-supporting-Spatialite-4.2.patch
0017-CVE-2019-3498.patch
+0018-CVE-2019-6975.patch
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