gsd-2020-5267
Vulnerability from gsd
Modified
2020-03-19 00:00
Details
There is a possible XSS vulnerability in ActionView's JavaScript literal
escape helpers. Views that use the `j` or `escape_javascript` methods
may be susceptible to XSS attacks.
Versions Affected: All.
Not affected: None.
Fixed Versions: 6.0.2.2, 5.2.4.2
Impact
------
There is a possible XSS vulnerability in the `j` and `escape_javascript`
methods in ActionView. These methods are used for escaping JavaScript string
literals. Impacted code will look something like this:
```erb
<script>let a = `<%= j unknown_input %>`</script>
```
or
```erb
<script>let a = `<%= escape_javascript unknown_input %>`</script>
```
Releases
--------
The 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.
Workarounds
-----------
For those that can't upgrade, the following monkey patch may be used:
```ruby
ActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!(
{
"`" => "\\`",
"$" => "\\$"
}
)
module ActionView::Helpers::JavaScriptHelper
alias :old_ej :escape_javascript
alias :old_j :j
def escape_javascript(javascript)
javascript = javascript.to_s
if javascript.empty?
result = ""
else
result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|\342\200\251|[\n\r"']|[`]|[$])/u, JS_ESCAPE_MAP)
end
javascript.html_safe? ? result.html_safe : result
end
alias :j :escape_javascript
end
```
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-5267",
"description": "In ActionView before versions 6.0.2.2 and 5.2.4.2, there is a possible XSS vulnerability in ActionView\u0027s JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS attacks. The issue is fixed in versions 6.0.2.2 and 5.2.4.2.",
"id": "GSD-2020-5267",
"references": [
"https://www.suse.com/security/cve/CVE-2020-5267.html",
"https://access.redhat.com/errata/RHSA-2020:4366"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "actionview",
"purl": "pkg:gem/actionview"
}
}
],
"aliases": [
"CVE-2020-5267",
"GHSA-65cv-r6x7-79hv"
],
"details": "There is a possible XSS vulnerability in ActionView\u0027s JavaScript literal\nescape helpers. Views that use the `j` or `escape_javascript` methods\nmay be susceptible to XSS attacks.\n\nVersions Affected: All.\nNot affected: None.\nFixed Versions: 6.0.2.2, 5.2.4.2\n\nImpact\n------\nThere is a possible XSS vulnerability in the `j` and `escape_javascript`\nmethods in ActionView. These methods are used for escaping JavaScript string\nliterals. Impacted code will look something like this:\n\n```erb\n\u003cscript\u003elet a = `\u003c%= j unknown_input %\u003e`\u003c/script\u003e\n```\n\nor\n\n```erb\n\u003cscript\u003elet a = `\u003c%= escape_javascript unknown_input %\u003e`\u003c/script\u003e\n```\n\nReleases\n--------\nThe 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.\n\nWorkarounds\n-----------\nFor those that can\u0027t upgrade, the following monkey patch may be used:\n\n```ruby\nActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!(\n {\n \"`\" =\u003e \"\\\\`\",\n \"$\" =\u003e \"\\\\$\"\n }\n)\n\nmodule ActionView::Helpers::JavaScriptHelper\n alias :old_ej :escape_javascript\n alias :old_j :j\n\n def escape_javascript(javascript)\n javascript = javascript.to_s\n if javascript.empty?\n result = \"\"\n else\n result = javascript.gsub(/(\\\\|\u003c\\/|\\r\\n|\\342\\200\\250|\\342\\200\\251|[\\n\\r\"\u0027]|[`]|[$])/u, JS_ESCAPE_MAP)\n end\n javascript.html_safe? ? result.html_safe : result\n end\n\n alias :j :escape_javascript\nend\n```\n",
"id": "GSD-2020-5267",
"modified": "2020-03-19T00:00:00.000Z",
"published": "2020-03-19T00:00:00.000Z",
"references": [
{
"type": "WEB",
"url": "https://groups.google.com/forum/#!topic/rubyonrails-security/55reWMM_Pg8"
}
],
"schema_version": "1.4.0",
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"score": 4.0,
"type": "CVSS_V3"
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"summary": "Possible XSS vulnerability in ActionView"
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"date": "2020-03-19",
"description": "There is a possible XSS vulnerability in ActionView\u0027s JavaScript literal\nescape helpers. Views that use the `j` or `escape_javascript` methods\nmay be susceptible to XSS attacks.\n\nVersions Affected: All.\nNot affected: None.\nFixed Versions: 6.0.2.2, 5.2.4.2\n\nImpact\n------\nThere is a possible XSS vulnerability in the `j` and `escape_javascript`\nmethods in ActionView. These methods are used for escaping JavaScript string\nliterals. Impacted code will look something like this:\n\n```erb\n\u003cscript\u003elet a = `\u003c%= j unknown_input %\u003e`\u003c/script\u003e\n```\n\nor\n\n```erb\n\u003cscript\u003elet a = `\u003c%= escape_javascript unknown_input %\u003e`\u003c/script\u003e\n```\n\nReleases\n--------\nThe 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.\n\nWorkarounds\n-----------\nFor those that can\u0027t upgrade, the following monkey patch may be used:\n\n```ruby\nActionView::Helpers::JavaScriptHelper::JS_ESCAPE_MAP.merge!(\n {\n \"`\" =\u003e \"\\\\`\",\n \"$\" =\u003e \"\\\\$\"\n }\n)\n\nmodule ActionView::Helpers::JavaScriptHelper\n alias :old_ej :escape_javascript\n alias :old_j :j\n\n def escape_javascript(javascript)\n javascript = javascript.to_s\n if javascript.empty?\n result = \"\"\n else\n result = javascript.gsub(/(\\\\|\u003c\\/|\\r\\n|\\342\\200\\250|\\342\\200\\251|[\\n\\r\"\u0027]|[`]|[$])/u, JS_ESCAPE_MAP)\n end\n javascript.html_safe? ? result.html_safe : result\n end\n\n alias :j :escape_javascript\nend\n```\n",
"framework": "rails",
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"description": "In ActionView there is a possible XSS vulnerability in ActionView\u0027s JavaScript literal escape helpers. Views that use the `j` or `escape_javascript` methods may be susceptible to XSS.",
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"package_slug": "gem/actionview",
"pubdate": "2020-03-19",
"solution": "Upgrade to versions 5.2.4.2, 6.0.2.2 or above.",
"title": "Cross-site Scripting",
"urls": [
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"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "NONE",
"baseScore": 3.5,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 6.8,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "LOW",
"userInteractionRequired": true
},
"baseMetricV3": {
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
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"userInteraction": "REQUIRED",
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"version": "3.1"
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"exploitabilityScore": 1.7,
"impactScore": 2.7
}
},
"lastModifiedDate": "2023-02-03T16:39Z",
"publishedDate": "2020-03-19T18:15Z"
}
}
}
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