English/pages_MacUS/wls_set_content.html on the Canon MG3100, MG5300, MG6100, MP495, MX340, MX870, MX890, MX920, and MX922 printers shows the Wi-Fi PSK passphrase in cleartext, which allows physically proximate attackers to obtain sensitive information by reading the screen of an unattended workstation.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-4614
• https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/canon_wireless.rb
• http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0146.html
• http://www.mattandreko.com/2013/06/canon-y-u-no-security.html