gsd-2015-7576
Vulnerability from gsd
Modified
2016-01-25 00:00
Details
There is a timing attack vulnerability in the basic authentication support
in Action Controller. This vulnerability has been assigned the CVE
identifier CVE-2015-7576.
Versions Affected: All.
Not affected: None.
Fixed Versions: 5.0.0.beta1.1, 4.2.5.1, 4.1.14.1, 3.2.22.1
Impact
------
Due to the way that Action Controller compares user names and passwords in
basic authentication authorization code, it is possible for an attacker to
analyze the time taken by a response and intuit the password.
For example, this string comparison:
"foo" == "bar"
is possibly faster than this comparison:
"foo" == "fo1"
Attackers can use this information to attempt to guess the username and
password used in the basic authentication system.
You can tell you application is vulnerable to this attack by looking for
`http_basic_authenticate_with` method calls in your application.
All users running an affected release should either upgrade or use one of
the workarounds immediately.
Releases
--------
The FIXED releases are available at the normal locations.
Workarounds
-----------
If you can't upgrade, please use the following monkey patch in an initializer
that is loaded before your application:
```
$ cat config/initializers/basic_auth_fix.rb
module ActiveSupport
module SecurityUtils
def secure_compare(a, b)
return false unless a.bytesize == b.bytesize
l = a.unpack "C#{a.bytesize}"
res = 0
b.each_byte { |byte| res |= byte ^ l.shift }
res == 0
end
module_function :secure_compare
def variable_size_secure_compare(a, b)
secure_compare(::Digest::SHA256.hexdigest(a), ::Digest::SHA256.hexdigest(b))
end
module_function :variable_size_secure_compare
end
end
module ActionController
class Base
def self.http_basic_authenticate_with(options = {})
before_action(options.except(:name, :password, :realm)) do
authenticate_or_request_with_http_basic(options[:realm] || "Application") do |name, password|
# This comparison uses & so that it doesn't short circuit and
# uses `variable_size_secure_compare` so that length information
# isn't leaked.
ActiveSupport::SecurityUtils.variable_size_secure_compare(name, options[:name]) &
ActiveSupport::SecurityUtils.variable_size_secure_compare(password, options[:password])
end
end
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.
* 4-1-basic_auth.patch - Patch for 4.1 series
* 4-2-basic_auth.patch - Patch for 4.2 series
* 5-0-basic_auth.patch - Patch for 5.0 series
Please note that only the 4.1.x and 4.2.x 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
-------
Thank you to Daniel Waterworth for reporting the problem and working with us to
fix it.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2015-7576",
"description": "The http_basic_authenticate_with method in actionpack/lib/action_controller/metal/http_authentication.rb in the Basic Authentication implementation in Action Controller in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not use a constant-time algorithm for verifying credentials, which makes it easier for remote attackers to bypass authentication by measuring timing differences.",
"id": "GSD-2015-7576",
"references": [
"https://www.suse.com/security/cve/CVE-2015-7576.html",
"https://www.debian.org/security/2016/dsa-3464",
"https://access.redhat.com/errata/RHSA-2016:0455",
"https://access.redhat.com/errata/RHSA-2016:0454",
"https://access.redhat.com/errata/RHSA-2016:0296"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "actionpack",
"purl": "pkg:gem/actionpack"
}
}
],
"aliases": [
"CVE-2015-7576",
"GHSA-p692-7mm3-3fxg"
],
"details": "There is a timing attack vulnerability in the basic authentication support\nin Action Controller. This vulnerability has been assigned the CVE\nidentifier CVE-2015-7576.\n\nVersions Affected: All.\nNot affected: None.\nFixed Versions: 5.0.0.beta1.1, 4.2.5.1, 4.1.14.1, 3.2.22.1\n\nImpact\n------\nDue to the way that Action Controller compares user names and passwords in\nbasic authentication authorization code, it is possible for an attacker to\nanalyze the time taken by a response and intuit the password.\n\nFor example, this string comparison:\n\n \"foo\" == \"bar\"\n\nis possibly faster than this comparison:\n\n \"foo\" == \"fo1\"\n\nAttackers can use this information to attempt to guess the username and\npassword used in the basic authentication system.\n\nYou can tell you application is vulnerable to this attack by looking for\n`http_basic_authenticate_with` method calls in your application.\n\nAll users running an affected release should either upgrade or use one of\nthe workarounds immediately.\n\nReleases\n--------\nThe FIXED releases are available at the normal locations.\n\nWorkarounds\n-----------\nIf you can\u0027t upgrade, please use the following monkey patch in an initializer\nthat is loaded before your application:\n\n```\n$ cat config/initializers/basic_auth_fix.rb\nmodule ActiveSupport\n module SecurityUtils\n def secure_compare(a, b)\n return false unless a.bytesize == b.bytesize\n\n l = a.unpack \"C#{a.bytesize}\"\n\n res = 0\n b.each_byte { |byte| res |= byte ^ l.shift }\n res == 0\n end\n module_function :secure_compare\n\n def variable_size_secure_compare(a, b)\n secure_compare(::Digest::SHA256.hexdigest(a), ::Digest::SHA256.hexdigest(b))\n end\n module_function :variable_size_secure_compare\n end\nend\n\nmodule ActionController\n class Base\n def self.http_basic_authenticate_with(options = {})\n before_action(options.except(:name, :password, :realm)) do\n authenticate_or_request_with_http_basic(options[:realm] || \"Application\") do |name, password|\n # This comparison uses \u0026 so that it doesn\u0027t short circuit and\n # uses `variable_size_secure_compare` so that length information\n # isn\u0027t leaked.\n ActiveSupport::SecurityUtils.variable_size_secure_compare(name, options[:name]) \u0026\n ActiveSupport::SecurityUtils.variable_size_secure_compare(password, options[:password])\n end\n end\n end\n end\nend\n```\n\n\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches for\nthe two supported release series. They are in git-am format and consist of a\nsingle changeset.\n\n* 4-1-basic_auth.patch - Patch for 4.1 series\n* 4-2-basic_auth.patch - Patch for 4.2 series\n* 5-0-basic_auth.patch - Patch for 5.0 series\n\nPlease note that only the 4.1.x and 4.2.x series are supported at present. Users\nof earlier unsupported releases are advised to upgrade as soon as possible as we\ncannot guarantee the continued availability of security fixes for unsupported\nreleases.\n\nCredits\n-------\n\nThank you to Daniel Waterworth for reporting the problem and working with us to\nfix it.\n",
"id": "GSD-2015-7576",
"modified": "2016-01-25T00:00:00.000Z",
"published": "2016-01-25T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/forum/#!topic/rubyonrails-security/ANv0HDHEC3k"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": 4.3,
"type": "CVSS_V2"
},
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}
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"summary": "Timing attack vulnerability in basic authentication in Action Controller."
}
},
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"ID": "CVE-2015-7576",
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{
"product": {
"product_data": [
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"value": "The http_basic_authenticate_with method in actionpack/lib/action_controller/metal/http_authentication.rb in the Basic Authentication implementation in Action Controller in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not use a constant-time algorithm for verifying credentials, which makes it easier for remote attackers to bypass authentication by measuring timing differences."
}
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"value": "n/a"
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"reference_data": [
{
"name": "[oss-security] 20160125 [CVE-2015-7576] Timing attack vulnerability in basic authentication in Action Controller.",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2016/01/25/8"
},
{
"name": "FEDORA-2016-3ede04cd79",
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"url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178068.html"
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},
{
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"url": "http://www.securityfocus.com/bid/81803"
},
{
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"refsource": "FEDORA",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178067.html"
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{
"name": "[ruby-security-ann] 20160125 [CVE-2015-7576] Timing attack vulnerability in basic authentication in Action Controller.",
"refsource": "MLIST",
"url": "https://groups.google.com/forum/message/raw?msg=ruby-security-ann/ANv0HDHEC3k/T8Hgq-hYEgAJ"
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},
"github.com/rubysec/ruby-advisory-db": {
"cve": "2015-7576",
"cvss_v2": 4.3,
"cvss_v3": 3.7,
"date": "2016-01-25",
"description": "There is a timing attack vulnerability in the basic authentication support\nin Action Controller. This vulnerability has been assigned the CVE\nidentifier CVE-2015-7576.\n\nVersions Affected: All.\nNot affected: None.\nFixed Versions: 5.0.0.beta1.1, 4.2.5.1, 4.1.14.1, 3.2.22.1\n\nImpact\n------\nDue to the way that Action Controller compares user names and passwords in\nbasic authentication authorization code, it is possible for an attacker to\nanalyze the time taken by a response and intuit the password.\n\nFor example, this string comparison:\n\n \"foo\" == \"bar\"\n\nis possibly faster than this comparison:\n\n \"foo\" == \"fo1\"\n\nAttackers can use this information to attempt to guess the username and\npassword used in the basic authentication system.\n\nYou can tell you application is vulnerable to this attack by looking for\n`http_basic_authenticate_with` method calls in your application.\n\nAll users running an affected release should either upgrade or use one of\nthe workarounds immediately.\n\nReleases\n--------\nThe FIXED releases are available at the normal locations.\n\nWorkarounds\n-----------\nIf you can\u0027t upgrade, please use the following monkey patch in an initializer\nthat is loaded before your application:\n\n```\n$ cat config/initializers/basic_auth_fix.rb\nmodule ActiveSupport\n module SecurityUtils\n def secure_compare(a, b)\n return false unless a.bytesize == b.bytesize\n\n l = a.unpack \"C#{a.bytesize}\"\n\n res = 0\n b.each_byte { |byte| res |= byte ^ l.shift }\n res == 0\n end\n module_function :secure_compare\n\n def variable_size_secure_compare(a, b)\n secure_compare(::Digest::SHA256.hexdigest(a), ::Digest::SHA256.hexdigest(b))\n end\n module_function :variable_size_secure_compare\n end\nend\n\nmodule ActionController\n class Base\n def self.http_basic_authenticate_with(options = {})\n before_action(options.except(:name, :password, :realm)) do\n authenticate_or_request_with_http_basic(options[:realm] || \"Application\") do |name, password|\n # This comparison uses \u0026 so that it doesn\u0027t short circuit and\n # uses `variable_size_secure_compare` so that length information\n # isn\u0027t leaked.\n ActiveSupport::SecurityUtils.variable_size_secure_compare(name, options[:name]) \u0026\n ActiveSupport::SecurityUtils.variable_size_secure_compare(password, options[:password])\n end\n end\n end\n end\nend\n```\n\n\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches for\nthe two supported release series. They are in git-am format and consist of a\nsingle changeset.\n\n* 4-1-basic_auth.patch - Patch for 4.1 series\n* 4-2-basic_auth.patch - Patch for 4.2 series\n* 5-0-basic_auth.patch - Patch for 5.0 series\n\nPlease note that only the 4.1.x and 4.2.x series are supported at present. Users\nof earlier unsupported releases are advised to upgrade as soon as possible as we\ncannot guarantee the continued availability of security fixes for unsupported\nreleases.\n\nCredits\n-------\n\nThank you to Daniel Waterworth for reporting the problem and working with us to\nfix it.\n",
"framework": "rails",
"gem": "actionpack",
"ghsa": "p692-7mm3-3fxg",
"patched_versions": [
"\u003e= 5.0.0.beta1.1",
"~\u003e 4.2.5, \u003e= 4.2.5.1",
"~\u003e 4.1.14, \u003e= 4.1.14.1",
"~\u003e 3.2.22.1"
],
"title": "Timing attack vulnerability in basic authentication in Action Controller.",
"url": "https://groups.google.com/forum/#!topic/rubyonrails-security/ANv0HDHEC3k"
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003e=5.0.0.alpha \u003c5.0.0.beta1.1||\u003e=4.2.0.alpha \u003c4.2.5.1||\u003e=4.0.0.alpha \u003c4.1.14.1||\u003c3.2.22.1",
"affected_versions": "All versions starting from 5.0.0.alpha before 5.0.0.beta1.1, all versions starting from 4.2.0.alpha before 4.2.5.1, all versions starting from 4.0.0.alpha before 4.1.14.1, all versions before 3.2.22.1",
"credit": "Daniel Waterworth",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
"cvss_v3": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-254",
"CWE-937"
],
"date": "2019-08-08",
"description": "Due to the way that Action Controller compares user names and passwords in basic authentication authorization code, it is possible for an attacker to analyze the time taken by a response and intuit the password. You can tell you application is vulnerable to this attack by looking for `http_basic_authenticate_with` method calls in your application. ",
"fixed_versions": [
"3.2.22.1",
"4.1.14.1",
"4.2.5.1",
"5.0.0.beta1.1"
],
"identifier": "CVE-2015-7576",
"identifiers": [
"CVE-2015-7576"
],
"package_slug": "gem/actionpack",
"pubdate": "2016-02-15",
"solution": "Upgrade to latest, apply patches or use workaround. See provided link.",
"title": "Timing attack vulnerability in basic authentication",
"urls": [
"https://groups.google.com/forum/#!topic/rubyonrails-security/ANv0HDHEC3k"
],
"uuid": "3460469f-62d8-4337-98df-e740e0ab1d28"
}
]
},
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"name": "[ruby-security-ann] 20160125 [CVE-2015-7576] Timing attack vulnerability in basic authentication in Action Controller.",
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"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
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},
"lastModifiedDate": "2019-08-08T15:43Z",
"publishedDate": "2016-02-16T02:59Z"
}
}
}
Loading…
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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.
- 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.