Incidents
Suspicious files in /tmp Jun 16 2007 06:13PM
kladizkov.thehome (kladizkov thehome gmail com) (3 replies)
Re: Suspicious files in /tmp Jun 18 2007 05:12PM
Jamie Riden (jamie riden gmail com)
Re: Suspicious files in /tmp Jun 18 2007 05:08PM
Jamie Riden (jamie riden gmail com)
Re: Suspicious files in /tmp Jun 18 2007 04:47PM
Matt D. Harris (mdh solitox net) (5 replies)
Re: Suspicious files in /tmp Jun 21 2007 11:38AM
Remko Lodder (remko elvandar org) (1 replies)
Re: Suspicious files in /tmp Jun 21 2007 08:05PM
Cy Schubert (Cy Schubert komquats com)
Re: Suspicious files in /tmp Jun 19 2007 01:33AM
Robin Sheat (robin kallisti net nz) (1 replies)
Re: Suspicious files in /tmp Jun 20 2007 04:47PM
Valdis Kletnieks vt edu (1 replies)
RE: Suspicious files in /tmp Jun 20 2007 11:06PM
Thyago Braga da Silva (tbraga gasecurity com br) (1 replies)
RE: Suspicious files in /tmp Jun 21 2007 05:09PM
kaneda bohater net (1 replies)
Re: Suspicious files in /tmp Jun 22 2007 12:19AM
Eduardo Tongson (propolice gmail com)
Re: Suspicious files in /tmp Jun 19 2007 12:23AM
Rainer Duffner (rainer ultra-secure de)
Re: Suspicious files in /tmp Jun 19 2007 12:17AM
Rainer Duffner (rainer ultra-secure de)

Am 18.06.2007 um 18:47 schrieb Matt D. Harris:

> They're being executed despite filesystem mount options because the
> script isn't being executed, the perl interpretter is. The script
> is being read and interpretted by the perl interpretter.
> Interesting - I hadn't thought of this before. Some logic to check
> the underlying filesystem of a script before reading it would be a
> very cool addition to perl from a security standpoint. Wouldn't be
> a big performance hit at all just to check once every require, etc
> as well. It'd need to be somewhat platform specific. Anyways, it
> would be neat for someone to bring this up within the Perl
> community as a possible idea, and maybe consider python, ruby, and
> others as well. Then there're various shells... I tested bash and
> FreeBSD's /bin/sh, and neither of them respect the noexec mount
> flag on FreeBSD either. It seems like this should be a relatively
> easy problem to correct, at least for the most common platforms.
> It's a thought that I'm going to bring up with the FreeBSD guys and
> see what their reaction is. Thanks for bringing this up here.
> Take care, Matt
>

A quick google search turned up the hint to disallow access to perl
(chmod 700 /usr/local/bin/perl, probably) and/or to write a wrapper
for it.

If you don't need CGI-scripts, you can chmod 700 it.
If cronjobs etc. (not running as root) still need it, maybe use sudo.

It's really a nuisance, all in all.
If you've got a big installation, there might be literally hundrets
of old pre-joomla mambos, old coppermines, galleries, phpBBs etc.
waiting for exploitation.
Not to forget the BCC-injection susceptible mail-forms and the
"index.php?page=bla.html"-allow-furl-open=yes morons...

cheers,
Rainer
--
Rainer Duffner
CISSP, LPI, MCSE
rainer (at) ultra-secure (dot) de [email concealed]

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[ reply ]
Re: Suspicious files in /tmp Jun 18 2007 09:32PM
Michal Zalewski (lcamtuf dione ids pl) (1 replies)
Re: Suspicious files in /tmp Jun 19 2007 12:37AM
Matt D. Harris (mdh solitox net)


 

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