Bugzilla – Bug 1224255
VUL-0: CVE-2024-4067: TRACKERBUG: the npm package `micromatch` is vulnerable to Regular Expression Denial of Service (ReDoS)
Last modified: 2024-05-23 19:47:32 UTC
The NPM package `micromatch` 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 persists. This issue should be mitigated by using a safe pattern that won't start backtracking the regular expression due to greedy matching. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-4067 https://www.cve.org/CVERecord?id=CVE-2024-4067 https://devhub.checkmarx.com/cve-details/CVE-2024-4067/ https://github.com/micromatch/micromatch/blob/2c56a8604b68c1099e7bc0f807ce0865a339747a/index.js#L448 https://github.com/micromatch/micromatch/issues/243 https://github.com/micromatch/micromatch/pull/247
Upstream still argues whether this is really a vulnerability. No fix yet. So we have to wait.
In most cases micromatch is only pulled in by eslint for development and not even present in runtime packages. The CVE scores for micromatch and braces are certainly way too alarmistic here. See upstream discussion.