CVE-2024-4067 Regular Expression Denial of Service in micromatch

2024-05-1310:04:42

CWE-1333

Checkmarx

www.cve.org

cve-2024-4067

redos

micromatch

npm

vulnerability

index.js

backtracking

pattern matching

fix

testing

mitigation

greedy matching

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

0.0004 Low

EPSS

Percentile

15.7%

JSON

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.

CNA Affected

[
  {
    "collectionURL": "https://www.npmjs.com/package/micromatch",
    "defaultStatus": "unaffected",
    "packageName": "micromatch",
    "product": "micromatch",
    "programFiles": [
      "index.js"
    ],
    "programRoutines": [
      {
        "name": "micromatch.braces = (pattern, options) =>"
      }
    ],
    "repo": "https://github.com/micromatch/micromatch",
    "vendor": "micromatch",
    "versions": [
      {
        "lessThanOrEqual": "4.05",
        "status": "affected",
        "version": "0",
        "versionType": "git"
      }
    ]
  }
]