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The sanitize_css method in lib/action_controller/vendor/html-scanner/html/sanitizer.rb in the Action Pack component in Ruby on Rails before 2.3.18, 3.0.x and 3.1.x before 3.1.12, and 3.2.x before 3.2.13 does not properly handle \n (newline) characters, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences.
Source: MITRE View Analysis Description
Source: MITRE
Base Score: 4.3 MEDIUM Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N) (V2 legend) Impact Subscore: 2.9 Exploitability Subscore: 8.6
Access Vector (AV): Network Access Complexity (AC): Medium Authentication (AU): None Confidentiality (C): None Integrity (I): Partial Availability (A): None Additional Information: Victim must voluntarily interact with attack mechanismAllows unauthorized modification
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OR *cpe:2.3:o:redhat:enterprise_linux:6:*:*:*:*:*:*:*
OR *cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
Configuration 1 OR *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.17:*:*:*:*:*:*:* (and previous) *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.11:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.12:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.10:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.14:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.13:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:2.3.16
Configuration 1 OR *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.12:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.8:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.7:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.0:rc1:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.0:rc2:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.11:*:*:*:*:*:*:* *cpe:2.3:a:rubyonrails:ruby_on_rails:3.2.0:*:*:*:*:*:*:*
http://rhn.redhat.com/errata/RHSA-2014-1863.html