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| Subject: | Re: Systems compromised with ShellBOT perl script - part 2 |
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| Date: | Wed, 20 Oct 2004 23:26:32 +0200 |
On Wed, Oct 20, 2004 at 12:04:36AM -0500, security@kemhosting.com wrote:
They (somehow) copied it into /tmp and executed it. This confuses me because I have my /tmp directory mounted rw,noexec,nosuid. Does Perl somehow bypass this?
"noexec" is a protection against accidental execution or script kiddies. It could be circumvented by running $ /lib/ld-linux.so.2 /tmp/binary or in case of perl (or any other interpretter) $ perl /tmp/script.pl There is probably some patch (by Ulrich Drepper?) in linux-2.6 which makes it harder to circumvent "noexec" flag this way but my opinion is that flagging the file as not executable in no way guarantees that no one will read it and execute instructions written in it (in traditional DAC/unix environment) ... Martin Mačok IT Security Consultant
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