GSD-2020-8184
Vulnerability from gsd - Updated: 2020-06-15 00:00Details
It is possible to forge a secure or host-only cookie prefix in Rack using
an arbitrary cookie write by using URL encoding (percent-encoding) on the
name of the cookie. This could result in an application that is dependent on
this prefix to determine if a cookie is safe to process being manipulated
into processing an insecure or cross-origin request.
This vulnerability has been assigned the CVE identifier CVE-2020-8184.
Versions Affected: rack < 2.2.3, rack < 2.1.4
Not affected: Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process
Fixed Versions: rack >= 2.2.3, rack >= 2.1.4
Impact
------
An attacker may be able to trick a vulnerable application into processing an
insecure (non-SSL) or cross-origin request if they can gain the ability to write
arbitrary cookies that are sent to the application.
Workarounds
-----------
If your application is impacted but you cannot upgrade to the released versions or apply
the provided patch, this issue can be temporarily addressed by adding the following workaround:
```
module Rack
module Utils
module_function def parse_cookies_header(header)
return {} unless header
header.split(/[;] */n).each_with_object({}) do |cookie, cookies|
next if cookie.empty?
key, value = cookie.split('=', 2)
cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)
end
end
end
end
```
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8184",
"description": "A reliance on cookies without validation/integrity check security vulnerability exists in rack \u003c 2.2.3, rack \u003c 2.1.4 that makes it is possible for an attacker to forge a secure or host-only cookie prefix.",
"id": "GSD-2020-8184",
"references": [
"https://www.suse.com/security/cve/CVE-2020-8184.html",
"https://access.redhat.com/errata/RHSA-2020:4366",
"https://ubuntu.com/security/CVE-2020-8184",
"https://advisories.mageia.org/CVE-2020-8184.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "rack",
"purl": "pkg:gem/rack"
}
}
],
"aliases": [
"CVE-2020-8184",
"GHSA-j6w9-fv6q-3q52"
],
"details": "It is possible to forge a secure or host-only cookie prefix in Rack using\nan arbitrary cookie write by using URL encoding (percent-encoding) on the\nname of the cookie. This could result in an application that is dependent on\nthis prefix to determine if a cookie is safe to process being manipulated\ninto processing an insecure or cross-origin request.\nThis vulnerability has been assigned the CVE identifier CVE-2020-8184.\n\nVersions Affected: rack \u003c 2.2.3, rack \u003c 2.1.4\nNot affected: Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process\nFixed Versions: rack \u003e= 2.2.3, rack \u003e= 2.1.4\n\nImpact\n------\n\nAn attacker may be able to trick a vulnerable application into processing an\ninsecure (non-SSL) or cross-origin request if they can gain the ability to write\narbitrary cookies that are sent to the application.\n\nWorkarounds\n-----------\n\nIf your application is impacted but you cannot upgrade to the released versions or apply\nthe provided patch, this issue can be temporarily addressed by adding the following workaround:\n\n```\nmodule Rack\n module Utils\n module_function def parse_cookies_header(header)\n return {} unless header\n header.split(/[;] */n).each_with_object({}) do |cookie, cookies|\n next if cookie.empty?\n key, value = cookie.split(\u0027=\u0027, 2)\n cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)\n end\n end\n end\nend\n```\n",
"id": "GSD-2020-8184",
"modified": "2020-06-15T00:00:00.000Z",
"published": "2020-06-15T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": 7.5,
"type": "CVSS_V3"
}
],
"summary": "Percent-encoded cookies can be used to overwrite existing prefixed cookie names"
}
},
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}
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"refsource": "MISC",
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"name": "[debian-lts-announce] 20200710 [SECURITY] [DLA 2275-1] ruby-rack security update",
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"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2023/01/msg00038.html"
}
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},
"github.com/rubysec/ruby-advisory-db": {
"cve": "2020-8184",
"cvss_v3": 7.5,
"date": "2020-06-15",
"description": "It is possible to forge a secure or host-only cookie prefix in Rack using\nan arbitrary cookie write by using URL encoding (percent-encoding) on the\nname of the cookie. This could result in an application that is dependent on\nthis prefix to determine if a cookie is safe to process being manipulated\ninto processing an insecure or cross-origin request.\nThis vulnerability has been assigned the CVE identifier CVE-2020-8184.\n\nVersions Affected: rack \u003c 2.2.3, rack \u003c 2.1.4\nNot affected: Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process\nFixed Versions: rack \u003e= 2.2.3, rack \u003e= 2.1.4\n\nImpact\n------\n\nAn attacker may be able to trick a vulnerable application into processing an\ninsecure (non-SSL) or cross-origin request if they can gain the ability to write\narbitrary cookies that are sent to the application.\n\nWorkarounds\n-----------\n\nIf your application is impacted but you cannot upgrade to the released versions or apply\nthe provided patch, this issue can be temporarily addressed by adding the following workaround:\n\n```\nmodule Rack\n module Utils\n module_function def parse_cookies_header(header)\n return {} unless header\n header.split(/[;] */n).each_with_object({}) do |cookie, cookies|\n next if cookie.empty?\n key, value = cookie.split(\u0027=\u0027, 2)\n cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)\n end\n end\n end\nend\n```\n",
"gem": "rack",
"ghsa": "j6w9-fv6q-3q52",
"patched_versions": [
"~\u003e 2.1.4",
"\u003e= 2.2.3"
],
"title": "Percent-encoded cookies can be used to overwrite existing prefixed cookie names",
"url": "https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak"
},
"gitlab.com": {
"advisories": [
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"cwe_ids": [
"CWE-1035",
"CWE-20",
"CWE-937"
],
"date": "2020-10-05",
"description": "A reliance on cookies without `validation/integrity` check security vulnerability exists in rack that makes it is possible for an attacker to forge a secure or host-only cookie prefix.",
"fixed_versions": [
"2.1.4",
"2.2.3"
],
"identifier": "CVE-2020-8184",
"identifiers": [
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"not_impacted": "All versions starting from 2.1.4 before 2.2.0, all versions starting from 2.2.3",
"package_slug": "gem/rack",
"pubdate": "2020-06-19",
"solution": "Upgrade to versions 2.1.4, 2.2.3 or above.",
"title": "Improper Input Validation",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-8184"
],
"uuid": "b960a2e0-c5c1-4117-b443-bf772494bcb7"
}
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"authentication": "NONE",
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"baseScore": 5.0,
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"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"lastModifiedDate": "2023-02-16T19:24Z",
"publishedDate": "2020-06-19T17:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- 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
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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.
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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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