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[CVE-2016-2097] Possible Information Leak Vulnerability in Action View #193

thesp0nge opened this issue Mar 1, 2016 · 0 comments


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@thesp0nge thesp0nge commented Mar 1, 2016

Possible Information Leak Vulnerability in Action View.

There is a possible directory traversal and information leak vulnerability in
Action View. This was meant to be fixed on CVE-2016-0752. However the 3.2 patch was not covering
all the scenarios. This vulnerability has been assigned the CVE identifier

Versions Affected: 3.2.x, 4.0.x, 4.1.x
Not affected: 4.2+
Fixed Versions:,


Applications that pass unverified user input to the render method in a
controller may be vulnerable to an information leak vulnerability.

Impacted code will look something like this:

def index
  render params[:id]

Carefully crafted requests can cause the above code to render files from
unexpected places like outside the application's view directory, and can
possibly escalate this to a remote code execution attack.

All users running an affected release should either upgrade or use one of the
workarounds immediately.


The FIXED releases are available at the normal locations.


A workaround to this issue is to not pass arbitrary user input to the render
method. Instead, verify that data before passing it to the render method.

For example, change this:

def index
  render params[:id]

To this:

def index
  render verify_template(params[:id])

def verify_template(name)
  # add verification logic particular to your application here


To aid users who aren't able to upgrade immediately we have provided patches for
it. It is in git-am format and consist of a single changeset.

  • 3-2-render_data_leak_2.patch - Patch for 3.2 series
  • 4-1-render_data_leak_2.patch - Patch for 4.1 series


Thanks to both Jyoti Singh and Tobias Kraze from makandra for reporting this and working with us in the patch!

@thesp0nge thesp0nge added the bug label Mar 1, 2016
@thesp0nge thesp0nge self-assigned this Mar 1, 2016
thesp0nge added a commit that referenced this issue Mar 1, 2016
…eak Vulnerability in Action View
@thesp0nge thesp0nge closed this Mar 1, 2016
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