Headline
CVE-2022-40023: fix tag regexp to match quoted groups correctly · sqlalchemy/mako@9257602
Sqlalchemy mako before 1.2.2 is vulnerable to Regular expression Denial of Service when using the Lexer class to parse. This also affects babelplugin and linguaplugin.
@@ -1,5 +1,7 @@
import re
import pytest
from mako import compat
from mako import exceptions
from mako import parsetree
@@ -146,6 +148,10 @@ def test_noexpr_allowed(self):
“"”
assert_raises(exceptions.CompileException, Lexer(template).parse)
def test_tag_many_quotes(self):
template = “<%0” + ‘"’ * 3000
assert_raises(exceptions.SyntaxException, Lexer(template).parse)
def test_unmatched_tag(self):
template = “"”
<%namespace name="bar">
@@ -432,9 +438,16 @@ def test_expr_in_attribute(self):
),
)
def test_pagetag(self):
template = “"”
<%page cached="True", args="a, b"/>
@pytest.mark.parametrize("comma,numchars", [(",", 48), ("", 47)])
def test_pagetag(self, comma, numchars):
# note that the comma here looks like:
# <%page cached="True", args="a, b"/>
# that’s what this test has looked like for decades, however, the
# comma there is not actually the right syntax. When issue #366
# was fixed, the reg was altered to accommodate for this comma to allow
# backwards compat
template = f"""
<%page cached="True"{comma} args="a, b"/>
some template
“"”
@@ -453,7 +466,7 @@ def test_pagetag(self):
some template
""",
(2, 48),
(2, numchars),
),
],
),
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Sqlalchemy mako before 1.2.2 is vulnerable to Regular expression Denial of Service when using the Lexer class to parse. This also affects babelplugin and linguaplugin.