Headline
CVE-2021-4235: Add logic to catch cases of alias abuse. · go-yaml/yaml@bb4e33b
Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resources. If parsing user input, this may be used as a denial of service vector.
@@ -854,6 +854,18 @@ var unmarshalErrorTests = []struct { {"{{.}}", `yaml: invalid map key: map\[interface\ \{\}\]interface \{\}\{".":interface \{\}\(nil\)\}`}, {"b: *a\na: &a {c: 1}", `yaml: unknown anchor ‘a’ referenced`}, {"%TAG !%79! tag:yaml.org,2002:\n—\nv: !%79!int '1’", "yaml: did not find expected whitespace"}, { “a: &a [00,00,00,00,00,00,00,00,00]\n” + “b: &b [*a,*a,*a,*a,*a,*a,*a,*a,*a]\n” + “c: &c [*b,*b,*b,*b,*b,*b,*b,*b,*b]\n” + “d: &d [*c,*c,*c,*c,*c,*c,*c,*c,*c]\n” + “e: &e [*d,*d,*d,*d,*d,*d,*d,*d,*d]\n” + “f: &f [*e,*e,*e,*e,*e,*e,*e,*e,*e]\n” + “g: &g [*f,*f,*f,*f,*f,*f,*f,*f,*f]\n” + “h: &h [*g,*g,*g,*g,*g,*g,*g,*g,*g]\n” + "i: &i [*h,*h,*h,*h,*h,*h,*h,*h,*h]\n", "yaml: document contains excessive aliasing", }, }
func (s *S) TestUnmarshalErrors(c *C) {
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Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resources. If parsing user input, this may be used as a denial of service vector.