gsd-2021-41819
Vulnerability from gsd
Modified
2021-11-24 00:00
Details
The old versions of `CGI::Cookie.parse` applied URL decoding to cookie names. An attacker could exploit this vulnerability to spoof security prefixes in cookie names, which may be able to trick a vulnerable application. By this fix, `CGI::Cookie.parse` no longer decodes cookie names. Note that this is an incompatibility if cookie names that you are using include non-alphanumeric characters that are URL-encoded. This is the same issue of CVE-2020-8184. If you are using Ruby 2.7 or 3.0: * Please update the cgi gem to version 0.3.1, 0.2,1, and 0.1,1 or later. You can use `gem update cgi` to update it. If you are using bundler, please add `gem "cgi", ">= 0.3.1"`` to your `Gemfile`. * Alternatively, please update Ruby to 2.7.5 or 3.0.3. If you are using Ruby 2.6: * Please update Ruby to 2.6.9. You cannot use `gem update cgi` for Ruby 2.6 or prior.
Aliases
Aliases
CVE-2021-41819


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-41819",
    "description": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.",
    "id": "GSD-2021-41819",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-41819.html",
      "https://www.debian.org/security/2022/dsa-5066",
      "https://www.debian.org/security/2022/dsa-5067",
      "https://access.redhat.com/errata/RHSA-2022:0708",
      "https://access.redhat.com/errata/RHSA-2022:0582",
      "https://access.redhat.com/errata/RHSA-2022:0581",
      "https://access.redhat.com/errata/RHSA-2022:0544",
      "https://access.redhat.com/errata/RHSA-2022:0543",
      "https://ubuntu.com/security/CVE-2021-41819",
      "https://advisories.mageia.org/CVE-2021-41819.html",
      "https://security.archlinux.org/CVE-2021-41819",
      "https://linux.oracle.com/cve/CVE-2021-41819.html",
      "https://access.redhat.com/errata/RHSA-2022:5779",
      "https://access.redhat.com/errata/RHSA-2022:6447",
      "https://access.redhat.com/errata/RHSA-2022:6450",
      "https://access.redhat.com/errata/RHSA-2022:6855",
      "https://access.redhat.com/errata/RHSA-2022:6856"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "cgi",
            "purl": "pkg:gem/cgi"
          }
        }
      ],
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        "CVE-2021-41819",
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      "details": "The old versions of `CGI::Cookie.parse` applied URL decoding to cookie names.\nAn attacker could exploit this vulnerability to spoof security prefixes in\ncookie names, which may be able to trick a vulnerable application.\n\nBy this fix, `CGI::Cookie.parse` no longer decodes cookie names. Note that\nthis is an incompatibility if cookie names that you are using include\nnon-alphanumeric characters that are URL-encoded.\n\nThis is the same issue of CVE-2020-8184.\n\nIf you are using Ruby 2.7 or 3.0:\n\n* Please update the cgi gem to version 0.3.1, 0.2,1, and 0.1,1 or later. You\n  can use `gem update cgi` to update it. If you are using bundler, please add\n  `gem \"cgi\", \"\u003e= 0.3.1\"`` to your `Gemfile`.\n* Alternatively, please update Ruby to 2.7.5 or 3.0.3.\n\nIf you are using Ruby 2.6:\n\n* Please update Ruby to 2.6.9. You cannot use `gem update cgi` for Ruby 2.6 or\n  prior.",
      "id": "GSD-2021-41819",
      "modified": "2021-11-24T00:00:00.000Z",
      "published": "2021-11-24T00:00:00.000Z",
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        }
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      "schema_version": "1.4.0",
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      "description": "The old versions of `CGI::Cookie.parse` applied URL decoding to cookie names.\nAn attacker could exploit this vulnerability to spoof security prefixes in\ncookie names, which may be able to trick a vulnerable application.\n\nBy this fix, `CGI::Cookie.parse` no longer decodes cookie names. Note that\nthis is an incompatibility if cookie names that you are using include\nnon-alphanumeric characters that are URL-encoded.\n\nThis is the same issue of CVE-2020-8184.\n\nIf you are using Ruby 2.7 or 3.0:\n\n* Please update the cgi gem to version 0.3.1, 0.2,1, and 0.1,1 or later. You\n  can use `gem update cgi` to update it. If you are using bundler, please add\n  `gem \"cgi\", \"\u003e= 0.3.1\"`` to your `Gemfile`.\n* Alternatively, please update Ruby to 2.7.5 or 3.0.3.\n\nIf you are using Ruby 2.6:\n\n* Please update Ruby to 2.6.9. You cannot use `gem update cgi` for Ruby 2.6 or\n  prior.",
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      "related": {
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          "2020-8184"
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      "title": "Cookie Prefix Spoofing in CGI::Cookie.parse",
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          "date": "2022-09-10",
          "description": "CGI::Cookie.parse in Ruby mishandles security prefixes in cookie names. This also affects the CGI gem for Ruby.",
          "fixed_versions": [
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          "identifier": "CVE-2021-41819",
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          "not_impacted": "All versions before 0.1.0, all versions after 0.3.0",
          "package_slug": "gem/cgi",
          "pubdate": "2022-01-01",
          "solution": "Upgrade to version 0.3.1 or above.",
          "title": "Reliance on Cookies without Validation and Integrity Checking in a Security Decision",
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        "lastModified": "2024-01-24T05:15:11.853",
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}


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