There is a possible remote code execution vulnerability in Action Pack.
This vulnerability has been assigned the CVE identifier CVE-2016-2098.
Versions Affected: 3.2.x, 4.0.x, 4.1.x, 4.2.x
Not affected: 5.0+
Fixed Versions: 3.2.22.2, 4.1.14.2, 4.2.5.2
Applications that pass unverified user input to the render
method in a
controller or a view may be vulnerable to a code injection.
Impacted code will look like this:
class TestController < ApplicationController
def show
render params[:id]
end
end
An attacker could use the request parameters to coerce the above example
to execute arbitrary ruby code.
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]
end
To this:
def index
render verify_template(params[:id])
end
private
def verify_template(name)
# add verification logic particular to your application here
end
To aid users who arenβt able to upgrade immediately we have provided a
patch for it. It is in git-am format and consist of a single changeset.
Thanks to both Tobias Kraze from makandra and joernchen of Phenoelit for
reporting this!
CPE | Name | Operator | Version |
---|---|---|---|
actionpack | lt | 5.0.0.beta1 | |
actionpack | le | 3.2.22.1 | |
actionpack | ge | 3.2.23.0 | |
actionpack | le | 4.2.5.1 | |
actionpack | ge | 4.2.6.0 | |
actionpack | le | 4.1.14.1 | |
actionpack | ge | 4.1.15.0 |