Fwd: [oss-security] Unsafe Query Generation Risk in Ruby on Rails
(CVE-2012-2660)
Eitan Adler
lists at eitanadler.com
Sat Jun 2 05:59:02 UTC 2012
A vulnerability has been found in a port you maintain. Please commit
an update and write up a VuXML report. If you need help feel free to
email ports-security at freebsd.org,
---------- Forwarded message ----------
From: Aaron Patterson <tenderlove at ruby-lang.org>
Date: 31 May 2012 15:15
Subject: [oss-security] Unsafe Query Generation Risk in Ruby on Rails
(CVE-2012-2660)
To: oss-security at lists.openwall.com
Unsafe Query Generation Risk in Ruby on Rails
There is a vulnerability when Active Record is used in conjunction
with parameter parsing from Rack via Action Pack. This vulnerability
has been assigned the CVE identifier CVE-2012-2660.
Versions Affected: ALL versions
Not affected: NONE
Fixed Versions: 3.2.4, 3.1.5, 3.0.13
Impact
------
Due to the way Active Record interprets parameters in combination with
the way that Rack parses query parameters, it is possible for an
attacker to issue unexpected database queries with "IS NULL" where
clauses. This issue does *not* let an attacker insert arbitrary
values into an SQL query, however they can cause the query to check
for NULL where most users wouldn't expect it.
For example, a system has password reset with token functionality:
unless params[:token].nil?
user = User.find_by_token(params[:token])
user.reset_password!
end
An attacker can craft a request such that `params[:token]` will return
`[nil]`. The `[nil]` value will bypass the test for nil, but will
still add an "IS NULL" clause to the SQL query.
All users running an affected release should either upgrade or use one
of the work arounds immediately.
Releases
--------
The FIXED releases are available at the normal locations.
Workarounds
-----------
This problem can be mitigated by testing for `[nil]`. For example:
unless params[:token].nil? || params[:token] == [nil]
user = User.find_by_token(params[:token])
user.reset_password!
end
Another possible workaround is to cast to a known type and test
against that type. For example:
unless params[:token].to_s.empty?
user = User.find_by_token(params[:token])
user.reset_password!
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.
* 3-0-null_param.patch - Patch for 3.0 series
* 3-1-null_param.patch - Patch for 3.1 series
* 3-2-null_param.patch - Patch for 3.2 series
Please note that only the 3.1.x and 3.2.x 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 Ben Murphy for reporting the vulnerability to us, and to
Chad Pyne of thoughtbot for helping us verify the fix.
--
Aaron Patterson
http://tenderlovemaking.com/
--
Eitan Adler
-------------- next part --------------
From c202638225519b5e1a03ebe523b109c948fb0e52 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson at gmail.com>
Date: Wed, 30 May 2012 15:13:03 -0700
Subject: [PATCH] Strip [nil] from parameters hash. Thanks to Ben Murphy for
reporting this!
CVE-2012-2660
Conflicts:
actionpack/lib/action_dispatch/http/request.rb
---
actionpack/lib/action_dispatch/http/request.rb | 22 ++++++++++++++++++++
.../dispatch/request/query_string_parsing_test.rb | 7 +++++-
2 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 7c8557b..985b730 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -257,5 +257,27 @@ module ActionDispatch
def local?
LOCALHOST.any? { |local_ip| local_ip === remote_addr && local_ip === remote_ip }
end
+
+ protected
+
+ # Remove nils from the params hash
+ def deep_munge(hash)
+ hash.each_value do |v|
+ case v
+ when Array
+ v.grep(Hash) { |x| deep_munge(x) }
+ when Hash
+ deep_munge(v)
+ end
+ end
+
+ keys = hash.keys.find_all { |k| hash[k] == [nil] }
+ keys.each { |k| hash[k] = nil }
+ hash
+ end
+
+ def parse_query(qs)
+ deep_munge(super)
+ end
end
end
diff --git a/actionpack/test/dispatch/request/query_string_parsing_test.rb b/actionpack/test/dispatch/request/query_string_parsing_test.rb
index 071d80c..c7ab700 100644
--- a/actionpack/test/dispatch/request/query_string_parsing_test.rb
+++ b/actionpack/test/dispatch/request/query_string_parsing_test.rb
@@ -81,7 +81,12 @@ class QueryStringParsingTest < ActionController::IntegrationTest
end
test "query string without equal" do
- assert_parses({ "action" => nil }, "action")
+ assert_parses({"action" => nil}, "action")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar][]")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo][]")
+ assert_parses({"action"=>{"foo"=>[{"bar"=>nil}]}}, "action[foo][][bar]")
end
test "query string with empty key" do
--
1.7.5.4
-------------- next part --------------
From 5b83bbfab7d5770ed56366d739ff62ac70425008 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson at gmail.com>
Date: Wed, 30 May 2012 15:13:03 -0700
Subject: [PATCH] Strip [nil] from parameters hash. Thanks to Ben Murphy for
reporting this!
CVE-2012-2660
---
actionpack/lib/action_dispatch/http/request.rb | 22 ++++++++++++++++++++
.../dispatch/request/query_string_parsing_test.rb | 7 +++++-
2 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index c49cc56..9e1dc4b 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -267,6 +267,28 @@ module ActionDispatch
LOCALHOST.any? { |local_ip| local_ip === remote_addr && local_ip === remote_ip }
end
+ protected
+
+ # Remove nils from the params hash
+ def deep_munge(hash)
+ hash.each_value do |v|
+ case v
+ when Array
+ v.grep(Hash) { |x| deep_munge(x) }
+ when Hash
+ deep_munge(v)
+ end
+ end
+
+ keys = hash.keys.find_all { |k| hash[k] == [nil] }
+ keys.each { |k| hash[k] = nil }
+ hash
+ end
+
+ def parse_query(qs)
+ deep_munge(super)
+ end
+
private
def check_method(name)
diff --git a/actionpack/test/dispatch/request/query_string_parsing_test.rb b/actionpack/test/dispatch/request/query_string_parsing_test.rb
index f6a1475..181f51a 100644
--- a/actionpack/test/dispatch/request/query_string_parsing_test.rb
+++ b/actionpack/test/dispatch/request/query_string_parsing_test.rb
@@ -81,7 +81,12 @@ class QueryStringParsingTest < ActionDispatch::IntegrationTest
end
test "query string without equal" do
- assert_parses({ "action" => nil }, "action")
+ assert_parses({"action" => nil}, "action")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar][]")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo][]")
+ assert_parses({"action"=>{"foo"=>[{"bar"=>nil}]}}, "action[foo][][bar]")
end
test "query string with empty key" do
--
1.7.5.4
-------------- next part --------------
From dff6db18840e2fd1dd3f3e4ef0ae7a9a3986d01d Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson at gmail.com>
Date: Wed, 30 May 2012 15:13:03 -0700
Subject: [PATCH] Strip [nil] from parameters hash. Thanks to Ben Murphy for
reporting this!
CVE-2012-2660
---
actionpack/lib/action_dispatch/http/request.rb | 22 ++++++++++++++++++++
.../dispatch/request/query_string_parsing_test.rb | 7 +++++-
2 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 8209212..adbb5d1 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -247,6 +247,28 @@ module ActionDispatch
LOCALHOST.any? { |local_ip| local_ip === remote_addr && local_ip === remote_ip }
end
+ protected
+
+ # Remove nils from the params hash
+ def deep_munge(hash)
+ hash.each_value do |v|
+ case v
+ when Array
+ v.grep(Hash) { |x| deep_munge(x) }
+ when Hash
+ deep_munge(v)
+ end
+ end
+
+ keys = hash.keys.find_all { |k| hash[k] == [nil] }
+ keys.each { |k| hash[k] = nil }
+ hash
+ end
+
+ def parse_query(qs)
+ deep_munge(super)
+ end
+
private
def check_method(name)
diff --git a/actionpack/test/dispatch/request/query_string_parsing_test.rb b/actionpack/test/dispatch/request/query_string_parsing_test.rb
index f6a1475..181f51a 100644
--- a/actionpack/test/dispatch/request/query_string_parsing_test.rb
+++ b/actionpack/test/dispatch/request/query_string_parsing_test.rb
@@ -81,7 +81,12 @@ class QueryStringParsingTest < ActionDispatch::IntegrationTest
end
test "query string without equal" do
- assert_parses({ "action" => nil }, "action")
+ assert_parses({"action" => nil}, "action")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar]")
+ assert_parses({"action" => {"foo" => { "bar" => nil }}}, "action[foo][bar][]")
+ assert_parses({"action" => {"foo" => nil}}, "action[foo][]")
+ assert_parses({"action"=>{"foo"=>[{"bar"=>nil}]}}, "action[foo][][bar]")
end
test "query string with empty key" do
--
1.7.5.4
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 497 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-ruby/attachments/20120602/c77e15d3/attachment.pgp
More information about the freebsd-ruby
mailing list