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Sourced from json's changelog.

10.0.0

• Backward incompatible and security-related change to parsing "lookup" strings.

  This version restricts the supported syntax for bracketed "lookup" strings to fix a possible vulnerability (CVE-2020-7712). With a carefully crafted lookup string, command injection was possible. See #144 for a repro. If you use json (the CLI or as a node.js module) and run arbitrary user-provided strings as a "lookup", then you should upgrade.

  For the json CLI, a "lookup" string is the 'foo' in:

    echo ...some json... | json foo
  

  which allows you to lookup fields on the given JSON, e.g.:

    $ echo '{"foo": {"bar": "baz"}}' | json foo.bar
    baz
  

  If one of the lookup fields isn't a valid JS identifier, then the JS array notation is supported:

    $ echo '{"https://example.com": "my-value"}' | json '["https://example.com"]'
    my-value
  

  Before this change, json would effectively exec the string between the brackets as JS code such that things like the following were possible:

    $ echo '{"foo3": "bar"}' | json '["foo" + 3]'
    bar
  

  This change limits supported bracket syntax in lookups to a simple quoted string:

    ["..."]
    ['...']
    [`...`]      # no variable interpolation
  

  Otherwise generating an error of the form:

    json: error: invalid bracketed lookup string: "[\"foo\" + 3]" (must be of the form ['...'], ["..."], or [`...`])
  

• cc47981 BREAKING CHANGE: limit syntax for bracketed lookup strings to fix vuln (#145)
• 8d3cf25 Update README.md
• See full diff in compare view

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