The default configuration of the PJL Access value in the File System External Access settings on HP LaserJet MFP printers, Color LaserJet MFP printers, and LaserJet 4100, 4200, 4300, 5100, 8150, and 9000 printers enables PJL commands that use the device’s filesystem, which allows remote attackers to read arbitrary files via a command inside a print job, as demonstrated by a directory traversal attack.
secunia.com/advisories/42238
securityreason.com/securityalert/8328
securitytracker.com/id?1024741
www.exploit-db.com/exploits/15631
www.itrc.hp.com/service/cki/docDisplay.do?docId=emr_na-c02004333
www.nruns.com/_downloads/SA-2010%20003-Hewlett-Packard.pdf
www.securityfocus.com/bid/44882
www.vupen.com/english/advisories/2010/2987
exchange.xforce.ibmcloud.com/vulnerabilities/63261