GSD-2021-22903
Vulnerability from gsd - Updated: 2021-05-05 00:00Details
There is a possible Open Redirect Vulnerability in Action Pack. This
vulnerability has been assigned the CVE identifier CVE-2021-22903.
Versions Affected: >= v6.1.0.rc2
Not affected: < v6.1.0.rc2
Fixed Versions: 6.1.3.2
Impact
------
This is similar to CVE-2021-22881: 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.
Since rails/rails@9bc7ea5, strings in config.hosts that do not have a leading
dot are converted to regular expressions without proper escaping. This causes,
for example, config.hosts << "sub.example.com" to permit a request with a Host
header value of sub-example.com.
Workarounds
-----------
The following monkey patch put in an initializer can be used as a workaround:
```ruby
class ActionDispatch::HostAuthorization::Permissions
def sanitize_string(host)
if host.start_with?(".")
/\A(.+\.)?#{Regexp.escape(host[1..-1])}\z/i
else
/\A#{Regexp.escape host}\z/i
end
end
end
```
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-22903",
"description": "The actionpack ruby gem before 6.1.3.2 suffers from a possible 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. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts \u003c\u003c \"sub.example.com\"` to permit a request with a Host header value of `sub-example.com`.",
"id": "GSD-2021-22903",
"references": [
"https://www.suse.com/security/cve/CVE-2021-22903.html",
"https://security.archlinux.org/CVE-2021-22903"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "actionpack",
"purl": "pkg:gem/actionpack"
}
}
],
"aliases": [
"CVE-2021-22903",
"GHSA-5hq2-xf89-9jxq"
],
"details": "There is a possible Open Redirect Vulnerability in Action Pack. This\nvulnerability has been assigned the CVE identifier CVE-2021-22903.\n\nVersions Affected: \u003e= v6.1.0.rc2\nNot affected: \u003c v6.1.0.rc2\nFixed Versions: 6.1.3.2\n\nImpact\n------\nThis is similar to CVE-2021-22881: Specially crafted Host headers in\ncombination with certain \"allowed host\" formats can cause the Host\nAuthorization middleware in Action Pack to redirect users to a malicious\nwebsite.\n\nSince rails/rails@9bc7ea5, strings in config.hosts that do not have a leading\ndot are converted to regular expressions without proper escaping. This causes,\nfor example, config.hosts \u003c\u003c \"sub.example.com\" to permit a request with a Host\nheader value of sub-example.com.\n\nWorkarounds\n-----------\nThe following monkey patch put in an initializer can be used as a workaround:\n\n```ruby\nclass ActionDispatch::HostAuthorization::Permissions\n def sanitize_string(host)\n if host.start_with?(\".\")\n /\\A(.+\\.)?#{Regexp.escape(host[1..-1])}\\z/i\n else\n /\\A#{Regexp.escape host}\\z/i\n end\n end\nend\n```\n",
"id": "GSD-2021-22903",
"modified": "2021-05-05T00:00:00.000Z",
"published": "2021-05-05T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/g/rubyonrails-security/c/8TxqXEtgSF0"
}
],
"related": [
"CVE-2021-22881"
],
"schema_version": "1.4.0",
"severity": [
{
"score": 6.1,
"type": "CVSS_V3"
}
],
"summary": "Possible Open Redirect Vulnerability in Action Pack"
}
},
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"product": {
"product_data": [
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"product_name": "https://github.com/rails/rails",
"version": {
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"value": "The actionpack ruby gem before 6.1.3.2 suffers from a possible 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. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts \u003c\u003c \"sub.example.com\"` to permit a request with a Host header value of `sub-example.com`."
}
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"lang": "eng",
"value": "Open Redirect (CWE-601)"
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"name": "https://hackerone.com/reports/1148025",
"refsource": "MISC",
"url": "https://hackerone.com/reports/1148025"
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"name": "https://discuss.rubyonrails.org/t/cve-2021-22903-possible-open-redirect-vulnerability-in-action-pack/77867",
"refsource": "MISC",
"url": "https://discuss.rubyonrails.org/t/cve-2021-22903-possible-open-redirect-vulnerability-in-action-pack/77867"
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},
"github.com/rubysec/ruby-advisory-db": {
"cve": "2021-22903",
"cvss_v3": 6.1,
"date": "2021-05-05",
"description": "There is a possible Open Redirect Vulnerability in Action Pack. This\nvulnerability has been assigned the CVE identifier CVE-2021-22903.\n\nVersions Affected: \u003e= v6.1.0.rc2\nNot affected: \u003c v6.1.0.rc2\nFixed Versions: 6.1.3.2\n\nImpact\n------\nThis is similar to CVE-2021-22881: Specially crafted Host headers in\ncombination with certain \"allowed host\" formats can cause the Host\nAuthorization middleware in Action Pack to redirect users to a malicious\nwebsite.\n\nSince rails/rails@9bc7ea5, strings in config.hosts that do not have a leading\ndot are converted to regular expressions without proper escaping. This causes,\nfor example, config.hosts \u003c\u003c \"sub.example.com\" to permit a request with a Host\nheader value of sub-example.com.\n\nWorkarounds\n-----------\nThe following monkey patch put in an initializer can be used as a workaround:\n\n```ruby\nclass ActionDispatch::HostAuthorization::Permissions\n def sanitize_string(host)\n if host.start_with?(\".\")\n /\\A(.+\\.)?#{Regexp.escape(host[1..-1])}\\z/i\n else\n /\\A#{Regexp.escape host}\\z/i\n end\n end\nend\n```\n",
"framework": "rails",
"gem": "actionpack",
"ghsa": "5hq2-xf89-9jxq",
"patched_versions": [
"\u003e= 6.1.3.2"
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"related": {
"cve": [
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"title": "Possible Open Redirect Vulnerability in Action Pack",
"unaffected_versions": [
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"url": "https://groups.google.com/g/rubyonrails-security/c/8TxqXEtgSF0"
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"gitlab.com": {
"advisories": [
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"affected_versions": "All versions before 6.1.3.2",
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"cwe_ids": [
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"CWE-601",
"CWE-937"
],
"date": "2021-06-22",
"description": "The actionpack ruby gem suffers from a possible 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.",
"fixed_versions": [
"6.1.3.2"
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"identifier": "CVE-2021-22903",
"identifiers": [
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"not_impacted": "All versions starting from 6.1.3.2",
"package_slug": "gem/actionpack",
"pubdate": "2021-06-11",
"solution": "Upgrade to version 6.1.3.2 or above.",
"title": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-22903",
"https://hackerone.com/reports/1148025"
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"uuid": "669f8ad3-cea6-4de6-9b47-08c1d9aff085"
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{
"affected_range": "\u003e=6.1.0 \u003c=6.1.3.2",
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"cwe_ids": [
"CWE-1035",
"CWE-601",
"CWE-937"
],
"date": "2021-10-21",
"description": "This is similar to CVE-2021-22881. 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.",
"fixed_versions": [
"6.1.4"
],
"identifier": "CVE-2021-22903",
"identifiers": [
"CVE-2021-22903"
],
"not_impacted": "All versions before 6.1.0, all versions after 6.1.3.2",
"package_slug": "gem/rails",
"pubdate": "2021-06-11",
"solution": "Upgrade to version 6.1.4 or above.",
"title": "URL Redirection to Untrusted Site (Open Redirect)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-22903",
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"uuid": "d83ed165-0122-4c11-a5e2-218de9bb42a6"
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"impact": {
"baseMetricV2": {
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"authentication": "NONE",
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"baseScore": 5.8,
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"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
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}
},
"lastModifiedDate": "2021-10-21T14:32Z",
"publishedDate": "2021-06-11T16:15Z"
}
}
}
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