Vulnerabilities affecting this package (0)
| Vulnerability |
Summary |
Fixed by |
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This package is not known to be affected by vulnerabilities.
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Vulnerabilities fixed by this package (1)
| Vulnerability |
Summary |
Aliases |
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VCID-v9mt-t1pb-hybk
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Cross site scripting vulnerability in ActionView
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.
### 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
```
### 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.
* [5-2-js-helper-xss.patch](https://gist.github.com/tenderlove/c042ff49f0347c37e99183a6502accc6#file-5-2-js-helper-xss-patch) - Patch for 5.2 series
* [6-0-js-helper-xss.patch](https://gist.github.com/tenderlove/c042ff49f0347c37e99183a6502accc6#file-6-0-js-helper-xss-patch) - Patch for 6.0 series
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
|
CVE-2020-5267
GHSA-65cv-r6x7-79hv
|