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Had anyone suggested and/or implemented something like building a tiny wrapper for bash that would clean environment and then execve("/bin/bash.vulnerable", argv, cleaned_envp)?



In the red hat links (already in the comments here) there is an LD_PRELOAD file which cleans the environment for _all_ your processes.


    $ /usr/bin/env - /usr/local/bin/bash -c set sh
    BASH=/usr/local/bin/bash
    ...




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