Sass version 1.17.3 is a minor update from the previous stable version, 1.17.2, in the popular pure JavaScript implementation of the Sass stylesheet language. Both versions, licensed under MIT, offer a way to extend CSS with features like variables, nesting, and mixins. Targeted at developers seeking a robust CSS preprocessor, both rely on chokidar version 2.0.0 or higher for file watching capabilities, useful in development workflows where automatic recompilation on file changes is desired. The core functionality remains consistent, allowing developers to continue crafting streamlined and maintainable stylesheets.
The primary difference between the two versions lies in their distribution size and release date. Version 1.17.3, released on March 15, 2019, has an unpacked size of 674,043 bytes, slightly larger than version 1.17.2's 668,852 bytes released on February 23, 2019, suggesting minor internal changes or optimizations. While the file count remains the same at 4, the updated releaseDate points to bug fixes, performance improvements or dependency updates that might affect specific use-cases. Developers experiencing issues with version 1.17.2 might find 1.17.3 a worthwhile upgrade, as it probably includes backported fixes or improvements as the team kept working in the project. Check the CHANGELOG for more specific details of the changes between the versions.
All the vulnerabilities related to the version 1.17.3 of the package
Uncontrolled resource consumption in braces
The NPM package braces fails to limit the number of characters it can handle, which could lead to Memory Exhaustion. In lib/parse.js, if a malicious user sends "imbalanced braces" as input, the parsing will enter a loop, which will cause the program to start allocating heap memory without freeing it at any moment of the loop. Eventually, the JavaScript heap limit is reached, and the program will crash.
Regular Expression Denial of Service (ReDoS) in micromatch
The NPM package micromatch prior to version 4.0.8 is vulnerable to Regular Expression Denial of Service (ReDoS). The vulnerability occurs in micromatch.braces() in index.js because the pattern .* will greedily match anything. By passing a malicious payload, the pattern matching will keep backtracking to the input while it doesn't find the closing bracket. As the input size increases, the consumption time will also increase until it causes the application to hang or slow down. There was a merged fix but further testing shows the issue persisted prior to https://github.com/micromatch/micromatch/pull/266. This issue should be mitigated by using a safe pattern that won't start backtracking the regular expression due to greedy matching.
