gsd-2021-22881
Vulnerability from gsd
Modified
2021-02-10 00:00
Details
There is a possible open redirect vulnerability in the Host Authorization
middleware in Action Pack. This vulnerability has been assigned the CVE
identifier CVE-2021-22881.
Versions Affected: >= 6.0.0
Not affected: < 6.0.0
Fixed Versions: 6.1.2.1, 6.0.3.5
Impact
------
Specially crafted "Host" headers in combination with certain "allowed host"
formats can cause the Host Authorization middleware in Action Pack to redirect
users to a malicious website.
Impacted applications will have allowed hosts with a leading dot. For
example, configuration files that look like this:
```
config.hosts << '.tkte.ch'
```
When an allowed host contains a leading dot, a specially crafted Host header
can be used to redirect to a malicious website.
Workarounds
-----------
In the case a patch can't be applied, the following monkey patch can be used
in an initializer:
```ruby
module ActionDispatch
class HostAuthorization
private
def authorized?(request)
valid_host = /
\A
(?<host>[a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9\.:]+\])
(:\d+)?
\z
/x
origin_host = valid_host.match(
request.get_header("HTTP_HOST").to_s.downcase)
forwarded_host = valid_host.match(
request.x_forwarded_host.to_s.split(/,\s?/).last)
origin_host && @permissions.allows?(origin_host[:host]) && (
forwarded_host.nil? || @permissions.allows?(forwarded_host[:host]))
end
end
end
```
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-22881",
"description": "The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.",
"id": "GSD-2021-22881",
"references": [
"https://www.suse.com/security/cve/CVE-2021-22881.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "actionpack",
"purl": "pkg:gem/actionpack"
}
}
],
"aliases": [
"CVE-2021-22881",
"GHSA-8877-prq4-9xfw"
],
"details": "There is a possible open redirect vulnerability in the Host Authorization\nmiddleware in Action Pack. This vulnerability has been assigned the CVE\nidentifier CVE-2021-22881.\n\nVersions Affected: \u003e= 6.0.0\nNot affected: \u003c 6.0.0\nFixed Versions: 6.1.2.1, 6.0.3.5\n\nImpact\n------\nSpecially crafted \"Host\" headers in combination with certain \"allowed host\"\nformats can cause the Host Authorization middleware in Action Pack to redirect\nusers to a malicious website.\n\nImpacted applications will have allowed hosts with a leading dot. For\nexample, configuration files that look like this:\n\n```\nconfig.hosts \u003c\u003c \u0027.tkte.ch\u0027\n```\n\nWhen an allowed host contains a leading dot, a specially crafted Host header\ncan be used to redirect to a malicious website.\n\nWorkarounds\n-----------\nIn the case a patch can\u0027t be applied, the following monkey patch can be used\nin an initializer:\n\n```ruby\nmodule ActionDispatch\n class HostAuthorization\n private\n def authorized?(request)\n valid_host = /\n \\A\n (?\u003chost\u003e[a-z0-9.-]+|\\[[a-f0-9]*:[a-f0-9\\.:]+\\])\n (:\\d+)?\n \\z\n /x\n\n origin_host = valid_host.match(\n request.get_header(\"HTTP_HOST\").to_s.downcase)\n forwarded_host = valid_host.match(\n request.x_forwarded_host.to_s.split(/,\\s?/).last)\n\n origin_host \u0026\u0026 @permissions.allows?(origin_host[:host]) \u0026\u0026 (\n forwarded_host.nil? || @permissions.allows?(forwarded_host[:host]))\n end\n end\nend\n```\n",
"id": "GSD-2021-22881",
"modified": "2021-02-10T00:00:00.000Z",
"published": "2021-02-10T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": 6.1,
"type": "CVSS_V3"
}
],
"summary": "Possible Open Redirect in Host Authorization Middleware"
}
},
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"vendor": {
"vendor_data": [
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"product": {
"product_data": [
{
"product_name": "https://github.com/rails/rails",
"version": {
"version_data": [
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"version_value": "Fixed in 6.1.2.1, 6.0.3.5"
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"value": "The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website."
}
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"problemtype": {
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"value": "Open Redirect (CWE-601)"
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"url": "https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130"
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"name": "https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/",
"refsource": "MISC",
"url": "https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/"
},
{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/"
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{
"name": "[oss-security] 20210505 [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2021/05/05/2"
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{
"name": "[oss-security] 20210819 [CVE-2021-22942] Possible Open Redirect in Host Authorization Middleware",
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"url": "http://www.openwall.com/lists/oss-security/2021/08/20/1"
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{
"name": "[oss-security] 20211214 [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware",
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"github.com/rubysec/ruby-advisory-db": {
"cve": "2021-22881",
"cvss_v3": 6.1,
"date": "2021-02-10",
"description": "There is a possible open redirect vulnerability in the Host Authorization\nmiddleware in Action Pack. This vulnerability has been assigned the CVE\nidentifier CVE-2021-22881.\n\nVersions Affected: \u003e= 6.0.0\nNot affected: \u003c 6.0.0\nFixed Versions: 6.1.2.1, 6.0.3.5\n\nImpact\n------\nSpecially crafted \"Host\" headers in combination with certain \"allowed host\"\nformats can cause the Host Authorization middleware in Action Pack to redirect\nusers to a malicious website.\n\nImpacted applications will have allowed hosts with a leading dot. For\nexample, configuration files that look like this:\n\n```\nconfig.hosts \u003c\u003c \u0027.tkte.ch\u0027\n```\n\nWhen an allowed host contains a leading dot, a specially crafted Host header\ncan be used to redirect to a malicious website.\n\nWorkarounds\n-----------\nIn the case a patch can\u0027t be applied, the following monkey patch can be used\nin an initializer:\n\n```ruby\nmodule ActionDispatch\n class HostAuthorization\n private\n def authorized?(request)\n valid_host = /\n \\A\n (?\u003chost\u003e[a-z0-9.-]+|\\[[a-f0-9]*:[a-f0-9\\.:]+\\])\n (:\\d+)?\n \\z\n /x\n\n origin_host = valid_host.match(\n request.get_header(\"HTTP_HOST\").to_s.downcase)\n forwarded_host = valid_host.match(\n request.x_forwarded_host.to_s.split(/,\\s?/).last)\n\n origin_host \u0026\u0026 @permissions.allows?(origin_host[:host]) \u0026\u0026 (\n forwarded_host.nil? || @permissions.allows?(forwarded_host[:host]))\n end\n end\nend\n```\n",
"framework": "rails",
"gem": "actionpack",
"ghsa": "8877-prq4-9xfw",
"patched_versions": [
"~\u003e 6.0.3, \u003e= 6.0.3.5",
"\u003e= 6.1.2.1"
],
"title": "Possible Open Redirect in Host Authorization Middleware",
"unaffected_versions": [
"\u003c 6.0.0"
],
"url": "https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E"
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003e=6.0.0 \u003c6.0.3.5||\u003e=6.1.0 \u003c6.1.2.1||=33",
"affected_versions": "All versions starting from 6.0.0 before 6.0.3.5, all versions starting from 6.1.0 before 6.1.2.1, version 33",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
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"cwe_ids": [
"CWE-1035",
"CWE-601",
"CWE-937"
],
"date": "2021-09-21",
"description": "The Host Authorization middleware in Action Pack suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.",
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"6.1.2.1"
],
"identifier": "CVE-2021-22881",
"identifiers": [
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"not_impacted": "All versions before 6.0.0, all versions starting from 6.0.3.5 before 6.1.0, all versions starting from 6.1.2.1 before 33, all versions after 33",
"package_slug": "gem/actionpack",
"pubdate": "2021-02-11",
"solution": "Upgrade to versions 6.0.3.5, 6.1.2.1 or above.",
"title": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-22881"
],
"uuid": "b6b7cac1-ed1c-448d-921f-79262ac7d9e4"
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"cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-601",
"CWE-937"
],
"date": "2022-01-04",
"description": "The Host Authorization middleware in Action Pack suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.",
"fixed_versions": [
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"6.1.2.1"
],
"identifier": "CVE-2021-22881",
"identifiers": [
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"package_slug": "gem/rails",
"pubdate": "2021-02-11",
"solution": "Upgrade to versions 6.0.3.5, 6.1.2.1 or above.",
"title": "URL Redirection to Untrusted Site (Open Redirect)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-22881",
"https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130"
],
"uuid": "155d2c71-7cce-497d-97e0-82f2c90e1e54"
}
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"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.8,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 4.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": true
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 2.7
}
},
"lastModifiedDate": "2022-01-04T16:38Z",
"publishedDate": "2021-02-11T18:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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