NOTE: rails-ujs is part of Rails/actionview since 5.1.0.
There is a potential DOM based cross-site scripting issue in rails-ujs
which leverages the Clipboard API to target HTML elements that are
assigned the contenteditable attribute. This has the potential to
occur when pasting malicious HTML content from the clipboard that
includes a data-method, data-remote or data-disable-with attribute.
This vulnerability has been assigned the CVE identifier CVE-2023-23913.
Impact
If the specified malicious HTML clipboard content is provided to a
contenteditable element, this could result in the arbitrary execution
of javascript on the origin in question.
Releases
The FIXED releases are available at the normal locations.
Workarounds
We recommend that all users upgrade to one of the FIXED versions.
In the meantime, users can attempt to mitigate this vulnerability
by removing the contenteditable attribute from elements in pages
that rails-ujs will interact with.
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.
rails-ujs-data-method-contenteditable-6-1.patch - Patch for 6.1 series
rails-ujs-data-method-contenteditable-7-0.patch - Patch for 7.0 series
Please note that only the 7.0.Z and 6.1.Z series are
supported at present, and 6.0.Z for severe vulnerabilities.
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
We would like to thank ryotak 15 for reporting this!
There is a potential Cross-Site Scripting (XSS) vulnerability in Action
View's translation helpers. Views that allow the user to control the
default (not found) value of the t and translate helpers could be
susceptible to XSS attacks.
Impact
When an HTML-unsafe string is passed as the default for a missing
translation key named html or ending in _html,
the default string is incorrectly marked as HTML-safe and not escaped.
Vulnerable code may look like the following examples:
<%# The welcome_html translation is not defined for the current locale: %>
<%= t("welcome_html", default: untrusted_user_controlled_string) %>
<%# Neither the title.html translation nor the missing.html translation is defined for the current locale: %>
<%= t("title.html", default: [:"missing.html", untrusted_user_controlled_string]) %>
Workarounds
Impacted users who can’t upgrade to a patched Rails version can avoid
this issue by manually escaping default translations with the
html_escape helper (aliased as h):
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:
<script>let a = `<%= j unknown_input %>`</script>
or
<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:
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
There is an vulnerability in rails-ujs that allows attackers to send
CSRF tokens to wrong domains.
Versions Affected: rails <= 6.0.3
Not affected: Applications which don't use rails-ujs.
Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1
Impact
This is a regression of CVE-2015-1840.
In the scenario where an attacker might be able to control the href attribute of an anchor tag or
the action attribute of a form tag that will trigger a POST action, the attacker can set the
href or action to a cross-origin URL, and the CSRF token will be sent.
Workarounds
To work around this problem, change code that allows users to control the href attribute of an anchor
tag or the action attribute of a form tag to filter the user parameters.
For example, code like this:
link_to params
to code like this:
link_to filtered_params
def filtered_params
# Filter just the parameters that you trust
end
There is a possible XSS vulnerability in Action View tag helpers. Passing
untrusted input as hash keys can lead to a possible XSS vulnerability. This
vulnerability has been assigned the CVE identifier CVE-2022-27777.
Versions Affected: ALL
Not affected: NONE
Fixed Versions: 7.0.2.4, 6.1.5.1, 6.0.4.8, 5.2.7.1
Impact
If untrusted data is passed as the hash key for tag attributes, there is a
possibility that the untrusted data may not be properly escaped which can
lead to an XSS vulnerability.
NOTE: rails-ujs is part of Rails/actionview since 5.1.0.
There is a potential DOM based cross-site scripting issue in rails-ujs
which leverages the Clipboard API to target HTML elements that are
assigned the contenteditable attribute. This has the potential to
occur when pasting malicious HTML content from the clipboard that
includes a data-method, data-remote or data-disable-with attribute.
This vulnerability has been assigned the CVE identifier CVE-2023-23913.
Impact
If the specified malicious HTML clipboard content is provided to a
contenteditable element, this could result in the arbitrary execution
of javascript on the origin in question.
Releases
The FIXED releases are available at the normal locations.
Workarounds
We recommend that all users upgrade to one of the FIXED versions.
In the meantime, users can attempt to mitigate this vulnerability
by removing the contenteditable attribute from elements in pages
that rails-ujs will interact with.
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.
rails-ujs-data-method-contenteditable-6-1.patch - Patch for 6.1 series
rails-ujs-data-method-contenteditable-7-0.patch - Patch for 7.0 series
Please note that only the 7.0.Z and 6.1.Z series are
supported at present, and 6.0.Z for severe vulnerabilities.
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
We would like to thank ryotak 15 for reporting this!
