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Network Security Incidents
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Re: Suspicious files in /tmp

Subject: Re: Suspicious files in /tmp
Date: Fri, 22 Jun 2007 08:19:03 +0800
On 6/22/07, kaneda@bohater.net <kaneda@bohater.net> wrote:
On Wed, 20 Jun 2007, Thyago Braga da Silva wrote:

:] A binary which you have NOT permission to execute but only to read, it can
:] be executed.

Morning...

On 2.6 kernel its not possible JUST run directly from noexec partition:
<...>

Don't be misinformed. Vanilla 2.6.xx is not completely protected. On
2.6.20 you can
still run files on noexec mounts with ld-linux. You only need read access.

Get http://rootshell.be/~tongson/hello.bin. Save to a noexec mount.
$ /lib/ld-linux.so.2 /dev/shm/hello.bin
Hello world!

Regards, E

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