main/python3: fix CVE-2019-16056

ref #10795

2 files changed, 95 insertions, 2 deletions

diff --git a/main/python3/APKBUILD b/main/python3/APKBUILD
index a4926f1bd2a..86614add43d 100644
--- a/main/python3/APKBUILD
+++ b/main/python3/APKBUILD
@@ -5,7 +5,7 @@ pkgname=python3
 # the python2-tkinter's pkgver needs to be synchronized with this.
 pkgver=3.6.8
 _basever="${pkgver%.*}"
-pkgrel=0
+pkgrel=1
 pkgdesc="A high-level scripting language"
 url="http://www.python.org"
 arch="all"
@@ -19,10 +19,13 @@ source="http://www.python.org/ftp/python/$pkgver/Python-$pkgver.tar.xz
 	musl-find_library.patch
 	fix-xattrs-glibc.patch
 	CVE-2019-9636.patch
+	CVE-2019-16056.patch
 	"
 builddir="$srcdir/Python-$pkgver"
 
 # secfixes:
+#   3.6.8-r1:
+#   - CVE-2019-16056
 #   3.6.8-r0:
 #   - CVE-2018-14647
 #   - CVE-2018-20406
@@ -154,4 +157,5 @@ wininst() {
 sha512sums="b17867e451ebe662f50df83ed112d3656c089e7d750651ea640052b01b713b58e66aac9e082f71fd16f5b5510bc9b797f5ccd30f5399581e9aa406197f02938a  Python-3.6.8.tar.xz
 ab8eaa2858d5109049b1f9f553198d40e0ef8d78211ad6455f7b491af525bffb16738fed60fc84e960c4889568d25753b9e4a1494834fea48291b33f07000ec2  musl-find_library.patch
 37b6ee5d0d5de43799316aa111423ba5a666c17dc7f81b04c330f59c1d1565540eac4c585abe2199bbed52ebe7426001edb1c53bd0a17486a2a8e052d0f494ad  fix-xattrs-glibc.patch
-bf2ec0bdba63b714f99aa9783a31ab935b234cabe4dc482769462a55bd572c74e03f192fbc5e8a7e2b9a887a5eef7dc0c3819fb464b656f73b500d1b65b591ad  CVE-2019-9636.patch"
+bf2ec0bdba63b714f99aa9783a31ab935b234cabe4dc482769462a55bd572c74e03f192fbc5e8a7e2b9a887a5eef7dc0c3819fb464b656f73b500d1b65b591ad  CVE-2019-9636.patch
+e8708c4fef1b591dd7251b36a785f9bc6472f2a25fba11bc4116814e93e770230ebd0016285c28d9065c49c5bf2be10f72182e23fb2767e1875ef20c94b5c97c  CVE-2019-16056.patch"
diff --git a/main/python3/CVE-2019-16056.patch b/main/python3/CVE-2019-16056.patch
new file mode 100644
index 00000000000..b6b4d90385a
--- /dev/null
+++ b/main/python3/CVE-2019-16056.patch
@@ -0,0 +1,89 @@
+diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
+index 1fb8cb4..9815e4e 100644
+--- a/Lib/email/_header_value_parser.py
++++ b/Lib/email/_header_value_parser.py
+@@ -1561,6 +1561,8 @@ def get_domain(value):
+         token, value = get_dot_atom(value)
+     except errors.HeaderParseError:
+         token, value = get_atom(value)
++    if value and value[0] == '@':
++        raise errors.HeaderParseError('Invalid Domain')
+     if leader is not None:
+         token[:0] = [leader]
+     domain.append(token)
+diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
+index cdfa372..41ff6f8 100644
+--- a/Lib/email/_parseaddr.py
++++ b/Lib/email/_parseaddr.py
+@@ -379,7 +379,12 @@ class AddrlistClass:
+         aslist.append('@')
+         self.pos += 1
+         self.gotonext()
+-        return EMPTYSTRING.join(aslist) + self.getdomain()
++        domain = self.getdomain()
++        if not domain:
++            # Invalid domain, return an empty address instead of returning a
++            # local part to denote failed parsing.
++            return EMPTYSTRING
++        return EMPTYSTRING.join(aslist) + domain
+ 
+     def getdomain(self):
+         """Get the complete domain name from an address."""
+@@ -394,6 +399,10 @@ class AddrlistClass:
+             elif self.field[self.pos] == '.':
+                 self.pos += 1
+                 sdlist.append('.')
++            elif self.field[self.pos] == '@':
++                # bpo-34155: Don't parse domains with two `@` like
++                # `a@malicious.org@important.com`.
++                return EMPTYSTRING
+             elif self.field[self.pos] in self.atomends:
+                 break
+             else:
+diff --git a/Lib/test/test_email/test__header_value_parser.py b/Lib/test/test_email/test__header_value_parser.py
+index 676732b..577dc43 100644
+--- a/Lib/test/test_email/test__header_value_parser.py
++++ b/Lib/test/test_email/test__header_value_parser.py
+@@ -1418,6 +1418,16 @@ class TestParser(TestParserMixin, TestEmailBase):
+         self.assertEqual(addr_spec.domain, 'example.com')
+         self.assertEqual(addr_spec.addr_spec, 'star.a.star@example.com')
+ 
++    def test_get_addr_spec_multiple_domains(self):
++        with self.assertRaises(errors.HeaderParseError):
++            parser.get_addr_spec('star@a.star@example.com')
++
++        with self.assertRaises(errors.HeaderParseError):
++            parser.get_addr_spec('star@a@example.com')
++
++        with self.assertRaises(errors.HeaderParseError):
++            parser.get_addr_spec('star@172.17.0.1@example.com')
++
+     # get_obs_route
+ 
+     def test_get_obs_route_simple(self):
+diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
+index f97ccc6..68d0522 100644
+--- a/Lib/test/test_email/test_email.py
++++ b/Lib/test/test_email/test_email.py
+@@ -3035,6 +3035,20 @@ class TestMiscellaneous(TestEmailBase):
+         self.assertEqual(utils.parseaddr('<>'), ('', ''))
+         self.assertEqual(utils.formataddr(utils.parseaddr('<>')), '')
+ 
++    def test_parseaddr_multiple_domains(self):
++        self.assertEqual(
++            utils.parseaddr('a@b@c'),
++            ('', '')
++        )
++        self.assertEqual(
++            utils.parseaddr('a@b.c@c'),
++            ('', '')
++        )
++        self.assertEqual(
++            utils.parseaddr('a@172.17.0.1@c'),
++            ('', '')
++        )
++
+     def test_noquote_dump(self):
+         self.assertEqual(
+             utils.formataddr(('A Silly Person', 'person@dom.ain')),
+