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96 lines
3.9 KiB
96 lines
3.9 KiB
2 years ago
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diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
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index 737951e4b1b1..bc9c9b6241d4 100644
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--- a/Lib/email/_header_value_parser.py
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+++ b/Lib/email/_header_value_parser.py
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@@ -1561,6 +1561,8 @@ def get_domain(value):
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token, value = get_dot_atom(value)
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except errors.HeaderParseError:
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token, value = get_atom(value)
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+ if value and value[0] == '@':
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+ raise errors.HeaderParseError('Invalid Domain')
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if leader is not None:
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token[:0] = [leader]
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domain.append(token)
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diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
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index cdfa3729adc7..41ff6f8c000d 100644
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--- a/Lib/email/_parseaddr.py
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+++ b/Lib/email/_parseaddr.py
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@@ -379,7 +379,12 @@ def getaddrspec(self):
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aslist.append('@')
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self.pos += 1
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self.gotonext()
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- return EMPTYSTRING.join(aslist) + self.getdomain()
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+ domain = self.getdomain()
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+ if not domain:
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+ # Invalid domain, return an empty address instead of returning a
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+ # local part to denote failed parsing.
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+ return EMPTYSTRING
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+ return EMPTYSTRING.join(aslist) + domain
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def getdomain(self):
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"""Get the complete domain name from an address."""
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@@ -394,6 +399,10 @@ def getdomain(self):
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elif self.field[self.pos] == '.':
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self.pos += 1
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sdlist.append('.')
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+ elif self.field[self.pos] == '@':
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+ # bpo-34155: Don't parse domains with two `@` like
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+ # `a@malicious.org@important.com`.
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+ return EMPTYSTRING
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elif self.field[self.pos] in self.atomends:
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break
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else:
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diff --git a/Lib/test/test_email/test__header_value_parser.py b/Lib/test/test_email/test__header_value_parser.py
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index a2c900fa7fd2..02ef3e1006c6 100644
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--- a/Lib/test/test_email/test__header_value_parser.py
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+++ b/Lib/test/test_email/test__header_value_parser.py
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@@ -1418,6 +1418,16 @@ def test_get_addr_spec_dot_atom(self):
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self.assertEqual(addr_spec.domain, 'example.com')
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self.assertEqual(addr_spec.addr_spec, 'star.a.star@example.com')
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+ def test_get_addr_spec_multiple_domains(self):
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+ with self.assertRaises(errors.HeaderParseError):
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+ parser.get_addr_spec('star@a.star@example.com')
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+
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+ with self.assertRaises(errors.HeaderParseError):
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+ parser.get_addr_spec('star@a@example.com')
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+
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+ with self.assertRaises(errors.HeaderParseError):
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+ parser.get_addr_spec('star@172.17.0.1@example.com')
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+
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# get_obs_route
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def test_get_obs_route_simple(self):
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diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
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index f97ccc6711cc..68d052279987 100644
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--- a/Lib/test/test_email/test_email.py
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+++ b/Lib/test/test_email/test_email.py
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@@ -3035,6 +3035,20 @@ def test_parseaddr_empty(self):
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self.assertEqual(utils.parseaddr('<>'), ('', ''))
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self.assertEqual(utils.formataddr(utils.parseaddr('<>')), '')
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+ def test_parseaddr_multiple_domains(self):
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+ self.assertEqual(
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+ utils.parseaddr('a@b@c'),
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+ ('', '')
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+ )
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+ self.assertEqual(
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+ utils.parseaddr('a@b.c@c'),
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+ ('', '')
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+ )
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+ self.assertEqual(
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+ utils.parseaddr('a@172.17.0.1@c'),
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+ ('', '')
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+ )
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+
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def test_noquote_dump(self):
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self.assertEqual(
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utils.formataddr(('A Silly Person', 'person@dom.ain')),
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diff --git a/Misc/NEWS.d/next/Security/2019-05-04-13-33-37.bpo-34155.MJll68.rst b/Misc/NEWS.d/next/Security/2019-05-04-13-33-37.bpo-34155.MJll68.rst
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new file mode 100644
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index 000000000000..50292e29ed1d
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Security/2019-05-04-13-33-37.bpo-34155.MJll68.rst
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@@ -0,0 +1 @@
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+Fix parsing of invalid email addresses with more than one ``@`` (e.g. a@b@c.com.) to not return the part before 2nd ``@`` as valid email address. Patch by maxking & jpic.
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