There is a possible cross site scripting (XSS) vulnerability in ActionView's JavaScript literal escape helpers. Views that use the j or escape_javascript methods may be susceptible to XSS attacks.
<script>let a = `<%= j unknown_input %>`</script>
<script>let a = `<%= escape_javascript unknown_input %>`</script>
The 6.0.2.2 and 5.2.4.2 releases are available at the normal locations.
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
endPlease note that only the 5.2 and 6.0 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.
jessecampos Analyst
There is a possible cross site scripting (XSS) vulnerability in ActionView's JavaScript literal escape helpers. Views that use the
jorescape_javascriptmethods may be susceptible to XSS attacks.Impact
There is a possible XSS vulnerability in the
jandescape_javascriptmethods in ActionView. These methods are used for escaping JavaScript string literals. Impacted code will look something like this:or
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:
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.
Please note that only the 5.2 and 6.0 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 to Jesse Campos from Chef Secure
References