ghsa-5hq2-xf89-9jxq
Vulnerability from github
There is a possible Open Redirect Vulnerability in Action Pack.
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.
Releases
The fixed releases are available at the normal locations.
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
Patches
To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.
- 6-1-open-redirect.patch - Patch for 6.1 series
Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.
Credits
Thanks Jonathan Hefner (https://hackerone.com/jonathanhefner) for reporting this bug!
{
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "actionpack"
},
"ranges": [
{
"events": [
{
"introduced": "6.1.0.rc2"
},
{
"fixed": "6.1.3.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-22903"
],
"database_specific": {
"cwe_ids": [
"CWE-601"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-05T19:47:50Z",
"nvd_published_at": "2021-06-11T16:15:00Z",
"severity": "MODERATE"
},
"details": "There is a possible Open Redirect Vulnerability in Action Pack.\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 combination with certain \"allowed host\" formats can cause the Host Authorization 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 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.\n\n\nReleases\n--------\nThe fixed releases are available at the normal locations.\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\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.\n\n* 6-1-open-redirect.patch - Patch for 6.1 series\n\nPlease note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.\n\nCredits\n-------\n\nThanks Jonathan Hefner (https://hackerone.com/jonathanhefner) for reporting this bug!",
"id": "GHSA-5hq2-xf89-9jxq",
"modified": "2023-08-08T15:56:26Z",
"published": "2021-05-05T19:48:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22903"
},
{
"type": "WEB",
"url": "https://hackerone.com/reports/1148025"
},
{
"type": "WEB",
"url": "https://discuss.rubyonrails.org/t/cve-2021-22903-possible-open-redirect-vulnerability-in-action-pack/77867"
},
{
"type": "WEB",
"url": "https://github.com/rails/rails/releases/tag/v6.1.3.2"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22903.yml"
},
{
"type": "WEB",
"url": "https://groups.google.com/g/rubyonrails-security/c/8TxqXEtgSF0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "Possible Open Redirect Vulnerability in Action Pack"
}
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.
- 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.