GSD-2021-41819
Vulnerability from gsd - Updated: 2021-11-24 00:00Details
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
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"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"
},
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"name": "cgi",
"purl": "pkg:gem/cgi"
}
}
],
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"GHSA-4vf4-qmvg-mh7h"
],
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"id": "GSD-2021-41819",
"modified": "2021-11-24T00:00:00.000Z",
"published": "2021-11-24T00:00:00.000Z",
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"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
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}
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"cve": "2021-41819",
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"date": "2021-11-24",
"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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"ghsa": "4vf4-qmvg-mh7h",
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"~\u003e 0.2.1",
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"title": "Cookie Prefix Spoofing in CGI::Cookie.parse",
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
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"cwe_ids": [
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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.",
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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",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-41819",
"https://hackerone.com/reports/910552",
"https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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