feat: PoC write on target stdout and resume
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parent
67cd814c99
commit
2a9ce2e8c7
2 changed files with 47 additions and 18 deletions
57
src/main.rs
57
src/main.rs
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@ -1,9 +1,9 @@
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mod syscalls;
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use std::ffi::c_void;
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use nix::{Result, {sys::{ptrace, wait::waitpid}, unistd::Pid}};
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use nix::{Result, {sys::{ptrace, wait::waitpid}, unistd::Pid}, libc::{PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON}};
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use clap::Parser;
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use syscalls::prepare_exit;
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use syscalls::{prepare_mmap, prepare_write};
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#[derive(Parser, Debug)]
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#[command(author, version, about, long_about = None)]
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@ -16,19 +16,42 @@ struct NeedleArgs {
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word: u32,
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}
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pub fn write_buffer(pid: Pid, addr: usize, payload: &[u8], word:u32) -> Result<()> {
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let mut buffer = payload.to_vec();
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pub fn send_str(pid: Pid, syscall_addr: u64, data: &str) -> Result<usize> {
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let mut regs = ptrace::getregs(pid)?;
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regs.rip = syscall_addr;
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prepare_mmap(&mut regs, 0, data.len(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, 0xFFFFFFFFFFFFFFFF, 0);
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ptrace::setregs(pid, regs)?;
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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let zone_addr = ptrace::getregs(pid)?.rax as usize;
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write_buffer(pid, zone_addr, data.as_bytes(), 32)?; // TODO word size!
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Ok(zone_addr)
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}
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while buffer.len() % word as usize != 0 {
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buffer.push(0); // pad with zeros because we copy chunks of size 'word'
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pub fn read_buffer(pid: Pid, addr: usize, size: usize, word: u32) -> Result<Vec<u8>> {
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let mut out = vec![];
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for i in (0..size).step_by((word/8) as usize) {
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let data = ptrace::read(pid, (addr + i) as *mut c_void)?;
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for j in 0..(word/8) as usize {
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out.push(((data >> (j * 8)) & 0xFF) as u8);
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}
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}
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for i in (0..buffer.len()).step_by(word as usize) {
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unsafe {
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let offset = (addr + i) as *mut c_void;
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let data = (buffer.as_ptr().add(i)) as *mut c_void;
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ptrace::write(pid, offset, data)?;
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Ok(out)
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}
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pub fn write_buffer(pid: Pid, addr: usize, payload: &[u8], word:u32) -> Result<()> {
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let step = word / 8;
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let mut at = addr;
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for chunk in payload.chunks(step as usize) {
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let mut buf : u64 = 0;
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for (i, c) in chunk.iter().enumerate() {
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buf |= (*c as u64) << (i * 8);
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}
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unsafe { ptrace::write(pid, at as *mut c_void, buf as *mut c_void)?; }
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at += step as usize;
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}
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Ok(())
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@ -40,6 +63,7 @@ pub fn pwn(pid: Pid, _word_size: usize) -> Result<()> {
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let mut insn_addr;
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let mut curr_instr;
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// seek to syscall
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loop {
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prev_regs = ptrace::getregs(pid)?;
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insn_addr = prev_regs.rip;
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@ -64,19 +88,24 @@ pub fn pwn(pid: Pid, _word_size: usize) -> Result<()> {
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// ptrace::write(pid, insn_addr, syscall_insn.as_slice().as_ptr() as *mut c_void)?;
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// }
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let msg = send_str(pid, insn_addr, "injected!\n\0")?;
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let mut call_regs = prev_regs.clone();
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// call_regs.rip = insn_addr;
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prepare_exit(&mut call_regs, 69);
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call_regs.rip = insn_addr;
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prepare_write(&mut call_regs, 1, msg, 10);
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ptrace::setregs(pid, call_regs)?;
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ptrace::step(pid, None)?;
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waitpid(pid, None)?;
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// println!("Written payload to stdout on tracee");
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// restore code and registers
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// unsafe {
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// ptrace::write(pid, insn_addr, prev_instr.as_ptr() as *mut c_void)?;
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// }
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// ptrace::setregs(pid, prev_regs)?;
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ptrace::setregs(pid, prev_regs)?;
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Ok(())
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}
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@ -11,8 +11,8 @@ fn prepare_for_syscall(regs: &mut user_regs_struct, rax: u64, rdi: u64, rsi: u64
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}
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#[allow(unused)]
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pub fn prepare_mmap(regs: &mut user_regs_struct, addr: u64, len: u64, prot: u64, flags: u64, fd: u64, off: u64) {
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prepare_for_syscall(regs, 9, addr, len, prot, flags, fd, off);
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pub fn prepare_mmap(regs: &mut user_regs_struct, addr: u64, len: usize, prot: i32, flags: i32, fd: u64, off: u64) {
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prepare_for_syscall(regs, 9, addr, len as u64, prot as u64, flags as u64, fd, off);
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}
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#[allow(unused)]
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@ -21,8 +21,8 @@ pub fn prepare_open(regs: &mut user_regs_struct, filename: &str, flags: u64, mod
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}
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#[allow(unused)]
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pub fn prepare_write(regs: &mut user_regs_struct, fd: u64, buf: &str, count: usize) {
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prepare_for_syscall(regs, 1, fd, buf.as_ptr() as u64, count as u64, 0, 0, 0);
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pub fn prepare_write(regs: &mut user_regs_struct, fd: u64, buf: usize, count: usize) {
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prepare_for_syscall(regs, 1, fd, buf as u64, count as u64, 0, 0, 0);
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}
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#[allow(unused)]
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