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  1. Simple execve template

    2022-10-13 By qld

    A single challenge tonight, busy day. This one went easier than expected, no fiddling with offsets or planting binaries. Have I shown you that piece of code I got ready just in case, thanks to man execve ?

    /* execve.c */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int
main …
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  2. Simple shellcode and automation

    2022-10-12 By qld

    So, time to step up, there was no real binary exploitation so far, just some staring at the binaries and scripting with pwntools. These are gentle introductions to binary exploitation.

    Arch:     i386-32-little
RELRO:    Partial RELRO
Stack:    No canary found
NX:       NX disabled
PIE:      No PIE (0x8048000)
RWX:      Has …
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  3. Basic gdb usage

    2022-10-11 By qld

    Key takeaways here are gdb command lines as radare, uh, requires too much remembering esoteric keystrokes. Usual friends plus ida were good enough to solve it all in one day.

    gdb -x /opt/gdbinit/gdbinit ./file
set disassembly-flavor intel
break main
disassemble main
stepi
x/s address
x/8 …
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