Staging Environment: Content and features may be unstable or change without notice.
Advisory details: ruby_advisory_db / gems/actionview/CVE-2020-5267
Advisory ID ruby_advisory_db/gems/actionview/CVE-2020-5267
Aliases CVE-2020-5267
GHSA-65cv-r6x7-79hv
Summary Possible XSS vulnerability in ActionView 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 ```
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3 4.0
Reference id Reference type URL
https://groups.google.com/forum/#!topic/rubyonrails-security/55reWMM_Pg8

No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.

There are no known vectors.

There are no SSVC decisions available.