Date: Tue, 16 Jun 2015 11:04:49 -0700 From: Aaron Patterson <tenderlove@...y-lang.org> To: security@...e.de, rubyonrails-security@...glegroups.com, oss-security@...ts.openwall.com, ruby-security-ann@...glegroups.com Subject: [CVE-2015-1840] CSRF Vulnerability in jquery-ujs and jquery-rails CSRF Vulnerability in jquery-ujs and jquery-rails There is an vulnerability in jquery-ujs and jquery-rails that can be used to bypass CSP protections and allows attackers to send CSRF tokens to attacker domains. This vulnerability has been assigned the CVE identifier CVE-2015-1840. Versions Affected: All. Not affected: Applications which don't use jquery-ujs or jquery-rails. Fixed Versions: jquery-rails versions 4.0.4 and 3.1.3 and jquery-ujs 1.0.4. Impact ------ 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 " https://attacker.com" (note the leading space) that will be passed to JQuery, who will see this as a same origin request, and send the user's CSRF token to the attacker domain. Releases -------- The FIXED releases are available at the normal locations. 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 Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the supported release series. They are in git-am format and consist of a single changeset. * 1-0-3-jquery_ujs_csrf.patch - Patch for jquery-ujs 1.0.3. * 3-1-2-jquery-rails-csrf.patch - Patch for jquery-rails 3.1.2. * 4-0-3-jquery-rails-csrf.patch - Patch for jquery-rails 4.0.3. Credits ------- Thanks to Ben Toews of GitHub for reporting the vulnerability to us, and working with us on a fix. -- Aaron Patterson http://tenderlovemaking.com/ View attachment "1-0-3-jquery_ujs_csrf.patch" of type "text/plain" (8042 bytes) View attachment "3-1-2-jquery-rails-csrf.patch" of type "text/plain" (3240 bytes) View attachment "4-0-3-jquery-rails-csrf.patch" of type "text/plain" (3241 bytes) Content of type "application/pgp-signature" skipped
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