Tested with "Reflective SO injection". A library injection technique in which the concept of reflective programming is employed to perform the loading of a library from memory into a host process
https://github.com/infosecguerrilla/ReflectiveSOInjection
Download & compile injector
git clone https://github.com/infosecguerrilla/ReflectiveSOInjection
cd ReflectiveSOInjection/inject/src
gcc inject.c ptrace.c utils.c -ldl -o inject
launch a victim process, ex nc:
nc -l 6969
Inject sharedlib.so in nc (nc PID is 26558):
./inject -p 26558 /home/dreg/nasm_linux_x86_64_pure_sharedlib/sharedlib.so
[i] targeting process with pid 26558
[+] shared object mapped at 0x7fc8c7723000
[+] found dynamic segment at 0x7fc8c7725f50
[+] dynsym found at address 0x7fc8c7723218
[+] dynstr found at address 0x7fc8c7723260
[+] Resolved ReflectiveLoader offset to 0x1051
[i] Setting target registers to appropriate values
[i] Overwriting target memory region with shellcode
[+] Transfering execution to stage 0 shellcode
[+] Returned from Stage 0 shell code RIP of target is 0x5613de86c06e
[i] Stage 0 mmap returned memory address of 0x7fa898c22000.. verifying allocation succeeded..
[+] Okay.. mmap allocation was successful!
[+] Writing our shared object into the victim process address space MUAHAHAHA!!!
[+] Setting RIP to ReflectiveLoader function
[+] Calling ReflectiveLoader function! Let's hope this works ;D
ptrace(PTRACE_GETSIGINFO) failed
Just ignore the last failed msg
Done! you can see the injected SO code in nc terminal:
nc -l 6969
Hello Dreg from the sharedlib ASM from ReflectiveLoader
cd nasm_linux_x86_64_pure_sharedlib
chmod +x *
chmod +x withlibc/*
./build.sh
+ sudo apt-get install build-essential nasm
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
build-essential is already the newest version (12.9).
nasm is already the newest version (2.15.05-1).
0 upgraded, 0 newly installed, 0 to remove and 410 not upgraded.
+ rm -rf loader.o sharedlib.o sharedlib.so withlibc/sharedlib.so withlibc/loader
+ nasm -felf64 -o sharedlib.o sharedlib.asm
+ ld -lc --dynamic-linker /lib64/ld-linux-x86-64.so.2 -shared -soname sharedlib.so -o withlibc/sharedlib.so sharedlib.o -R .
+ gcc -nostdlib -ffreestanding -fno-builtin -no-pie -shared sharedlib.o -o sharedlib.so
+ gcc loader.c -ldl -o loader
+ cp loader withlibc/
cd nasm_linux_x86_64_pure_sharedlib
chmod +x *
chmod +x withlibc/*
./testlib.sh
testing no deps
+ objdump -x ./sharedlib.so
./sharedlib.so: file format elf64-x86-64
./sharedlib.so
architecture: i386:x86-64, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x0000000000001000
Program Header:
LOAD off 0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**12
filesz 0x0000000000000279 memsz 0x0000000000000279 flags r--
LOAD off 0x0000000000001000 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**12
filesz 0x00000000000000b8 memsz 0x00000000000000b8 flags r-x
LOAD off 0x0000000000002000 vaddr 0x0000000000002000 paddr 0x0000000000002000 align 2**12
filesz 0x0000000000000000 memsz 0x0000000000000000 flags r--
LOAD off 0x0000000000002f50 vaddr 0x0000000000002f50 paddr 0x0000000000002f50 align 2**12
filesz 0x00000000000000b0 memsz 0x00000000000000b0 flags rw-
DYNAMIC off 0x0000000000002f50 vaddr 0x0000000000002f50 paddr 0x0000000000002f50 align 2**3
filesz 0x00000000000000b0 memsz 0x00000000000000b0 flags rw-
NOTE off 0x00000000000001c8 vaddr 0x00000000000001c8 paddr 0x00000000000001c8 align 2**2
filesz 0x0000000000000024 memsz 0x0000000000000024 flags r--
RELRO off 0x0000000000002f50 vaddr 0x0000000000002f50 paddr 0x0000000000002f50 align 2**0
filesz 0x00000000000000b0 memsz 0x00000000000000b0 flags r--
Dynamic Section:
GNU_HASH 0x00000000000001f0
STRTAB 0x0000000000000260
SYMTAB 0x0000000000000218
STRSZ 0x0000000000000019
SYMENT 0x0000000000000018
Sections:
Idx Name Size VMA LMA File off Algn
0 .note.gnu.build-id 00000024 00000000000001c8 00000000000001c8 000001c8 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
1 .gnu.hash 00000028 00000000000001f0 00000000000001f0 000001f0 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .dynsym 00000048 0000000000000218 0000000000000218 00000218 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .dynstr 00000019 0000000000000260 0000000000000260 00000260 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .text 000000b8 0000000000001000 0000000000001000 00001000 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
5 .eh_frame 00000000 0000000000002000 0000000000002000 00002000 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .dynamic 000000b0 0000000000002f50 0000000000002f50 00002f50 2**3
CONTENTS, ALLOC, LOAD, DATA
SYMBOL TABLE:
0000000000000000 l df *ABS* 0000000000000000 sharedlib.asm
000000000000100f l .text 0000000000000000 msg
000000000000002e l *ABS* 0000000000000000 msglen
0000000000001047 l .text 0000000000000000 nxt
0000000000001060 l .text 0000000000000000 msg2
0000000000000038 l *ABS* 0000000000000000 msglen2
00000000000010a2 l .text 0000000000000000 sgt
00000000000010ac l .text 0000000000000000 ext
0000000000000000 l df *ABS* 0000000000000000
0000000000002f50 l O .dynamic 0000000000000000 _DYNAMIC
0000000000001000 g .text 0000000000000000 _start
0000000000001051 g F .text 0000000000000000 ReflectiveLoader
+ ldd ./sharedlib.so
statically linked
+ file ./sharedlib.so
./sharedlib.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped
+ ./loader
Hello from loader by Dreg
calling to ReflectiveLoader....
Hello Dreg from the sharedlib ASM from ReflectiveLoader
+ ./sharedlib.so
Hello Dreg from the sharedlib ASM from _start
+ /lib64/ld-linux-x86-64.so.2 ./sharedlib.so
Hello Dreg from the sharedlib ASM from _start
+ ldd ./sharedlib.so
statically linked
cd nasm_linux_x86_64_pure_sharedlib
chmod +x *
chmod +x withlibc/*
./testwithlibc.sh
testing with libc dep
+ cd withlibc
+ pwd
/home/dreg/nasm_linux_x86_64_pure_sharedlib/withlibc
+ objdump -x ./sharedlib.so
./sharedlib.so: file format elf64-x86-64
./sharedlib.so
architecture: i386:x86-64, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x0000000000001000
Program Header:
LOAD off 0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**12
filesz 0x000000000000024a memsz 0x000000000000024a flags r--
LOAD off 0x0000000000001000 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**12
filesz 0x00000000000000b8 memsz 0x00000000000000b8 flags r-x
LOAD off 0x0000000000002000 vaddr 0x0000000000002000 paddr 0x0000000000002000 align 2**12
filesz 0x0000000000000000 memsz 0x0000000000000000 flags r--
LOAD off 0x0000000000002f10 vaddr 0x0000000000002f10 paddr 0x0000000000002f10 align 2**12
filesz 0x00000000000000f0 memsz 0x00000000000000f0 flags rw-
DYNAMIC off 0x0000000000002f10 vaddr 0x0000000000002f10 paddr 0x0000000000002f10 align 2**3
filesz 0x00000000000000f0 memsz 0x00000000000000f0 flags rw-
RELRO off 0x0000000000002f10 vaddr 0x0000000000002f10 paddr 0x0000000000002f10 align 2**0
filesz 0x00000000000000f0 memsz 0x00000000000000f0 flags r--
Dynamic Section:
NEEDED libc.so.6
SONAME sharedlib.so
RUNPATH .
HASH 0x0000000000000190
GNU_HASH 0x00000000000001a8
STRTAB 0x0000000000000218
SYMTAB 0x00000000000001d0
STRSZ 0x0000000000000032
SYMENT 0x0000000000000018
Sections:
Idx Name Size VMA LMA File off Algn
0 .hash 00000018 0000000000000190 0000000000000190 00000190 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
1 .gnu.hash 00000028 00000000000001a8 00000000000001a8 000001a8 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .dynsym 00000048 00000000000001d0 00000000000001d0 000001d0 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .dynstr 00000032 0000000000000218 0000000000000218 00000218 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .text 000000b8 0000000000001000 0000000000001000 00001000 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
5 .eh_frame 00000000 0000000000002000 0000000000002000 00002000 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .dynamic 000000f0 0000000000002f10 0000000000002f10 00002f10 2**3
CONTENTS, ALLOC, LOAD, DATA
SYMBOL TABLE:
0000000000000000 l df *ABS* 0000000000000000 sharedlib.asm
000000000000100f l .text 0000000000000000 msg
000000000000002e l *ABS* 0000000000000000 msglen
0000000000001047 l .text 0000000000000000 nxt
0000000000001060 l .text 0000000000000000 msg2
0000000000000038 l *ABS* 0000000000000000 msglen2
00000000000010a2 l .text 0000000000000000 sgt
00000000000010ac l .text 0000000000000000 ext
0000000000000000 l df *ABS* 0000000000000000
0000000000002f10 l O .dynamic 0000000000000000 _DYNAMIC
0000000000001051 g F .text 0000000000000000 ReflectiveLoader
0000000000001000 g .text 0000000000000000 _start
+ ldd ./sharedlib.so
linux-vdso.so.1 (0x00007ffdd53e7000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fb183bed000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb183de3000)
+ file ./sharedlib.so
./sharedlib.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped
+ ./loader
Hello from loader by Dreg
calling to ReflectiveLoader....
Hello Dreg from the sharedlib ASM from ReflectiveLoader
+ ./sharedlib.so
Hello Dreg from the sharedlib ASM from _start
+ /lib64/ld-linux-x86-64.so.2 ./sharedlib.so
Hello Dreg from the sharedlib ASM from _start
+ ldd ./sharedlib.so
linux-vdso.so.1 (0x00007fff801ce000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f11dc070000)
/lib64/ld-linux-x86-64.so.2 (0x00007f11dc266000)
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