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-rw-r--r-- | recipes-devtools/python/python/CVE-2018-1060_CVE-2018-1061.patch | 149 | ||||
-rw-r--r-- | recipes-devtools/python/python_%.bbappend | 5 |
2 files changed, 154 insertions, 0 deletions
diff --git a/recipes-devtools/python/python/CVE-2018-1060_CVE-2018-1061.patch b/recipes-devtools/python/python/CVE-2018-1060_CVE-2018-1061.patch new file mode 100644 index 0000000..bb7aaf6 --- /dev/null +++ b/recipes-devtools/python/python/CVE-2018-1060_CVE-2018-1061.patch | |||
@@ -0,0 +1,149 @@ | |||
1 | From e052d40cea15f582b50947f7d906b39744dc62a2 Mon Sep 17 00:00:00 2001 | ||
2 | From: Benjamin Peterson <benjamin@python.org> | ||
3 | Date: Sat, 3 Mar 2018 22:18:17 -0800 | ||
4 | Subject: [PATCH] [2.7] bpo-32981: Fix catastrophic backtracking vulns | ||
5 | (GH-5955) | ||
6 | |||
7 | * Prevent low-grade poplib REDOS (CVE-2018-1060) | ||
8 | |||
9 | The regex to test a mail server's timestamp is susceptible to | ||
10 | catastrophic backtracking on long evil responses from the server. | ||
11 | |||
12 | Happily, the maximum length of malicious inputs is 2K thanks | ||
13 | to a limit introduced in the fix for CVE-2013-1752. | ||
14 | |||
15 | A 2KB evil response from the mail server would result in small slowdowns | ||
16 | (milliseconds vs. microseconds) accumulated over many apop calls. | ||
17 | This is a potential DOS vector via accumulated slowdowns. | ||
18 | |||
19 | Replace it with a similar non-vulnerable regex. | ||
20 | |||
21 | The new regex is RFC compliant. | ||
22 | The old regex was non-compliant in edge cases. | ||
23 | |||
24 | * Prevent difflib REDOS (CVE-2018-1061) | ||
25 | |||
26 | The default regex for IS_LINE_JUNK is susceptible to | ||
27 | catastrophic backtracking. | ||
28 | This is a potential DOS vector. | ||
29 | |||
30 | Replace it with an equivalent non-vulnerable regex. | ||
31 | |||
32 | Also introduce unit and REDOS tests for difflib. | ||
33 | |||
34 | CVE: CVE-2018-1060 CVE-2018-1061 | ||
35 | Upstream-Status: Backport | ||
36 | |||
37 | Co-authored-by: Tim Peters <tim.peters@gmail.com> | ||
38 | Co-authored-by: Christian Heimes <christian@python.org>. | ||
39 | (cherry picked from commit 0e6c8ee2358a2e23117501826c008842acb835ac) | ||
40 | Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com> | ||
41 | --- | ||
42 | Lib/difflib.py | 2 +- | ||
43 | Lib/poplib.py | 2 +- | ||
44 | Lib/test/test_difflib.py | 22 +++++++++++++++++++++- | ||
45 | Lib/test/test_poplib.py | 10 ++++++++++ | ||
46 | Misc/ACKS | 2 ++ | ||
47 | .../2018-03-02-10-24-52.bpo-32981.O_qDyj.rst | 4 ++++ | ||
48 | 6 files changed, 39 insertions(+), 3 deletions(-) | ||
49 | create mode 100644 Misc/NEWS.d/next/Security/2018-03-02-10-24-52.bpo-32981.O_qDyj.rst | ||
50 | |||
51 | diff --git a/Lib/difflib.py b/Lib/difflib.py | ||
52 | index 1c6fbdb..788a92d 100644 | ||
53 | --- a/Lib/difflib.py | ||
54 | +++ b/Lib/difflib.py | ||
55 | @@ -1103,7 +1103,7 @@ class Differ: | ||
56 | |||
57 | import re | ||
58 | |||
59 | -def IS_LINE_JUNK(line, pat=re.compile(r"\s*#?\s*$").match): | ||
60 | +def IS_LINE_JUNK(line, pat=re.compile(r"\s*(?:#\s*)?$").match): | ||
61 | r""" | ||
62 | Return 1 for ignorable line: iff `line` is blank or contains a single '#'. | ||
63 | |||
64 | diff --git a/Lib/poplib.py b/Lib/poplib.py | ||
65 | index b91e5f7..a238510 100644 | ||
66 | --- a/Lib/poplib.py | ||
67 | +++ b/Lib/poplib.py | ||
68 | @@ -274,7 +274,7 @@ class POP3: | ||
69 | return self._shortcmd('RPOP %s' % user) | ||
70 | |||
71 | |||
72 | - timestamp = re.compile(r'\+OK.*(<[^>]+>)') | ||
73 | + timestamp = re.compile(br'\+OK.[^<]*(<.*>)') | ||
74 | |||
75 | def apop(self, user, secret): | ||
76 | """Authorisation | ||
77 | diff --git a/Lib/test/test_difflib.py b/Lib/test/test_difflib.py | ||
78 | index 35f2c36..d8277b7 100644 | ||
79 | --- a/Lib/test/test_difflib.py | ||
80 | +++ b/Lib/test/test_difflib.py | ||
81 | @@ -269,13 +269,33 @@ class TestOutputFormat(unittest.TestCase): | ||
82 | self.assertEqual(fmt(3,6), '4,6') | ||
83 | self.assertEqual(fmt(0,0), '0') | ||
84 | |||
85 | +class TestJunkAPIs(unittest.TestCase): | ||
86 | + def test_is_line_junk_true(self): | ||
87 | + for line in ['#', ' ', ' #', '# ', ' # ', '']: | ||
88 | + self.assertTrue(difflib.IS_LINE_JUNK(line), repr(line)) | ||
89 | + | ||
90 | + def test_is_line_junk_false(self): | ||
91 | + for line in ['##', ' ##', '## ', 'abc ', 'abc #', 'Mr. Moose is up!']: | ||
92 | + self.assertFalse(difflib.IS_LINE_JUNK(line), repr(line)) | ||
93 | + | ||
94 | + def test_is_line_junk_REDOS(self): | ||
95 | + evil_input = ('\t' * 1000000) + '##' | ||
96 | + self.assertFalse(difflib.IS_LINE_JUNK(evil_input)) | ||
97 | + | ||
98 | + def test_is_character_junk_true(self): | ||
99 | + for char in [' ', '\t']: | ||
100 | + self.assertTrue(difflib.IS_CHARACTER_JUNK(char), repr(char)) | ||
101 | + | ||
102 | + def test_is_character_junk_false(self): | ||
103 | + for char in ['a', '#', '\n', '\f', '\r', '\v']: | ||
104 | + self.assertFalse(difflib.IS_CHARACTER_JUNK(char), repr(char)) | ||
105 | |||
106 | def test_main(): | ||
107 | difflib.HtmlDiff._default_prefix = 0 | ||
108 | Doctests = doctest.DocTestSuite(difflib) | ||
109 | run_unittest( | ||
110 | TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs, | ||
111 | - TestOutputFormat, Doctests) | ||
112 | + TestOutputFormat, TestJunkAPIs) | ||
113 | |||
114 | if __name__ == '__main__': | ||
115 | test_main() | ||
116 | diff --git a/Lib/test/test_poplib.py b/Lib/test/test_poplib.py | ||
117 | index 23d6887..d214375 100644 | ||
118 | --- a/Lib/test/test_poplib.py | ||
119 | +++ b/Lib/test/test_poplib.py | ||
120 | @@ -211,6 +211,16 @@ class TestPOP3Class(TestCase): | ||
121 | def test_rpop(self): | ||
122 | self.assertOK(self.client.rpop('foo')) | ||
123 | |||
124 | + def test_apop_REDOS(self): | ||
125 | + # Replace welcome with very long evil welcome. | ||
126 | + # NB The upper bound on welcome length is currently 2048. | ||
127 | + # At this length, evil input makes each apop call take | ||
128 | + # on the order of milliseconds instead of microseconds. | ||
129 | + evil_welcome = b'+OK' + (b'<' * 1000000) | ||
130 | + with test_support.swap_attr(self.client, 'welcome', evil_welcome): | ||
131 | + # The evil welcome is invalid, so apop should throw. | ||
132 | + self.assertRaises(poplib.error_proto, self.client.apop, 'a', 'kb') | ||
133 | + | ||
134 | def test_top(self): | ||
135 | expected = ('+OK 116 bytes', | ||
136 | ['From: postmaster@python.org', 'Content-Type: text/plain', | ||
137 | diff --git a/Misc/NEWS.d/next/Security/2018-03-02-10-24-52.bpo-32981.O_qDyj.rst b/Misc/NEWS.d/next/Security/2018-03-02-10-24-52.bpo-32981.O_qDyj.rst | ||
138 | new file mode 100644 | ||
139 | index 0000000..9ebabb4 | ||
140 | --- /dev/null | ||
141 | +++ b/Misc/NEWS.d/next/Security/2018-03-02-10-24-52.bpo-32981.O_qDyj.rst | ||
142 | @@ -0,0 +1,4 @@ | ||
143 | +Regexes in difflib and poplib were vulnerable to catastrophic backtracking. | ||
144 | +These regexes formed potential DOS vectors (REDOS). They have been | ||
145 | +refactored. This resolves CVE-2018-1060 and CVE-2018-1061. | ||
146 | +Patch by Jamie Davis. | ||
147 | -- | ||
148 | 1.9.1 | ||
149 | |||
diff --git a/recipes-devtools/python/python_%.bbappend b/recipes-devtools/python/python_%.bbappend new file mode 100644 index 0000000..b111f1a --- /dev/null +++ b/recipes-devtools/python/python_%.bbappend | |||
@@ -0,0 +1,5 @@ | |||
1 | FILESEXTRAPATHS_prepend := "${THISDIR}/python:" | ||
2 | |||
3 | SRC_URI += "file://CVE-2018-1060_CVE-2018-1061.patch \ | ||
4 | " | ||
5 | |||