Bluehammer Vulnerability Poc

by reason-machines2384a003145aNo license83 starsListed Oct 8, 2026Updated Oct 8, 2026Repository updated 3 months ago

Skill for working with the BlueHammer vulnerability proof-of-concept repository, covering build, usage, and code patterns.

Instructions onlySecurity

AI-generated overview

Guides building, running, and analyzing the BlueHammer C vulnerability proof-of-concept in an isolated lab.

What it does: This skill provides instructions for obtaining, building, running, and debugging the BlueHammer C proof-of-concept vulnerability repository. It covers PGP signature verification, GCC build flags, payload construction, and debugging with GDB, strace, and pwntools. It also lists common C coding bugs to look for when the PoC does not work as expected.
When to use it: Use it when working with the BlueHammer proof-of-concept repository, such as building or running it, understanding its code, or troubleshooting a non-working exploit. It is intended for authorized, isolated lab environments only.
Requirements: Requires the BlueHammer repository, a C compiler such as GCC, and optionally GDB, strace, ltrace, binutils, pwntools, Docker, and GnuPG for signature verification. Network access is needed to clone the repository and fetch PGP keys. No scripts ship with the skill.

BlueHammer Vulnerability PoC

Skill by ara.so — Daily 2026 Skills collection.

⚠️ Important Notice

BlueHammer is a proof-of-concept vulnerability repository intended for security research, education, and defensive purposes only. Use only in authorized, isolated lab environments. The author notes there are known bugs in the PoC that may prevent it from working as-is.

What BlueHammer Does

BlueHammer is a C-based proof-of-concept demonstrating a specific vulnerability. The repository is primarily a research artifact — it documents the vulnerability, provides a PoC exploit, and is signed with a PGP key for authenticity verification.

Getting the Code

Verify PGP Signature (Recommended)

The README is PGP signed. To verify authenticity:

bash

# Import the author's key (key ID from signature: FFoRCS0/SbA)gpg --keyserver keys.openpgp.org --recv-keys 494EF01FFC059584028479BEC5168442 4B4FD26C
# Verify the signed block in README.mdgpg --verify README.md

# Import the author's key (key ID from signature: FFoRCS0/SbA)gpg --keyserver keys.openpgp.org --recv-keys 494EF01FFC059584028479BEC5168442 4B4FD26C
# Verify the signed block in README.mdgpg --verify README.md

Building the PoC

Since the project is written in C with no build system documented, standard patterns apply:

Single-file build

bash

# If there is a single main source filegcc -o bluehammer bluehammer.c -Wall -Wextra
# With debug symbols for analysisgcc -g -O0 -o bluehammer_dbg bluehammer.c -Wall -Wextra
# If the project uses a Makefilemakemake clean && make

# If there is a single main source filegcc -o bluehammer bluehammer.c -Wall -Wextra
# With debug symbols for analysisgcc -g -O0 -o bluehammer_dbg bluehammer.c -Wall -Wextra
# If the project uses a Makefilemakemake clean && make

Common C build flags for vulnerability PoCs

bash

# Disable mitigations for testing (lab only)gcc -o bluehammer bluehammer.c \    -fno-stack-protector \    -z execstack \    -no-pie \    -Wall
# With address sanitizer for debugging crashesgcc -o bluehammer bluehammer.c \    -fsanitize=address \    -g -O1

# Disable mitigations for testing (lab only)gcc -o bluehammer bluehammer.c \    -fno-stack-protector \    -z execstack \    -no-pie \    -Wall
# With address sanitizer for debugging crashesgcc -o bluehammer bluehammer.c \    -fsanitize=address \    -g -O1

Running the PoC

bash

# Basic execution./bluehammer
# With a target argument (common pattern)./bluehammer <target>
# With verbose/debug output if supported./bluehammer -v <target>
# Check usage/help./bluehammer --help./bluehammer -h

# Basic execution./bluehammer
# With a target argument (common pattern)./bluehammer <target>
# With verbose/debug output if supported./bluehammer -v <target>
# Check usage/help./bluehammer --help./bluehammer -h

Code Patterns — Working with C Vulnerability PoCs

Reading and understanding the vulnerability trigger

#include <stdio.h>#include <stdlib.h>#include <string.h>
// Common pattern: controlled buffer to trigger the conditionvoid trigger_vulnerability(const char *input, size_t len) {    char buf[256];    // Inspect what the PoC does with input    memcpy(buf, input, len);  // potential overflow if len > 256    // ... vulnerability logic}
int main(int argc, char *argv[]) {    if (argc < 2) {        fprintf(stderr, "Usage: %s <payload>\n", argv[0]);        return 1;    }    trigger_vulnerability(argv[1], strlen(argv[1]));    return 0;}

#include <stdio.h>#include <stdlib.h>#include <string.h>
// Common pattern: controlled buffer to trigger the conditionvoid trigger_vulnerability(const char *input, size_t len) {    char buf[256];    // Inspect what the PoC does with input    memcpy(buf, input, len);  // potential overflow if len > 256    // ... vulnerability logic}
int main(int argc, char *argv[]) {    if (argc < 2) {        fprintf(stderr, "Usage: %s <payload>\n", argv[0]);        return 1;    }    trigger_vulnerability(argv[1], strlen(argv[1]));    return 0;}

Analyzing the PoC for bugs (author noted known bugs)

// When inspecting the PoC, look for these common issues:
// 1. Off-by-one errorschar buf[64];// Bug: should be < 64, not <= 64for (int i = 0; i <= 64; i++) buf[i] = 'A';
// Fix:for (int i = 0; i < 64; i++) buf[i] = 'A';
// 2. Missing null terminatorchar buf[8];strncpy(buf, "longinput", 8);  // no null terminator// Fix:strncpy(buf, "longinput", 7);buf[7] = '\0';
// 3. Incorrect size calculationint *arr = malloc(10);           // Bug: should be 10 * sizeof(int)int *arr_fixed = malloc(10 * sizeof(int));  // Fix
// 4. Wrong offset in exploit payloadsize_t offset = 128;  // may need adjustment per target binary/environment

// When inspecting the PoC, look for these common issues:
// 1. Off-by-one errorschar buf[64];// Bug: should be < 64, not <= 64for (int i = 0; i <= 64; i++) buf[i] = 'A';
// Fix:for (int i = 0; i < 64; i++) buf[i] = 'A';
// 2. Missing null terminatorchar buf[8];strncpy(buf, "longinput", 8);  // no null terminator// Fix:strncpy(buf, "longinput", 7);buf[7] = '\0';
// 3. Incorrect size calculationint *arr = malloc(10);           // Bug: should be 10 * sizeof(int)int *arr_fixed = malloc(10 * sizeof(int));  // Fix
// 4. Wrong offset in exploit payloadsize_t offset = 128;  // may need adjustment per target binary/environment

Sending a crafted payload

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>
#define PAYLOAD_SIZE 512#define OFFSET       264   // adjust based on binary analysis
int main(void) {    unsigned char payload[PAYLOAD_SIZE];
    // Fill with pattern for offset discovery    memset(payload, 'A', PAYLOAD_SIZE);
    // Overwrite return address (example — adjust for target)    unsigned long target_addr = 0xdeadbeefcafeUL;    memcpy(payload + OFFSET, &target_addr, sizeof(target_addr));
    // Write payload to stdout for piping    fwrite(payload, 1, PAYLOAD_SIZE, stdout);    return 0;}

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>
#define PAYLOAD_SIZE 512#define OFFSET       264   // adjust based on binary analysis
int main(void) {    unsigned char payload[PAYLOAD_SIZE];
    // Fill with pattern for offset discovery    memset(payload, 'A', PAYLOAD_SIZE);
    // Overwrite return address (example — adjust for target)    unsigned long target_addr = 0xdeadbeefcafeUL;    memcpy(payload + OFFSET, &target_addr, sizeof(target_addr));
    // Write payload to stdout for piping    fwrite(payload, 1, PAYLOAD_SIZE, stdout);    return 0;}

Debugging a non-working PoC

bash

# Run under GDB to catch crashesgdb ./bluehammer(gdb) run <args>(gdb) bt          # backtrace on crash(gdb) info registers
# Find the exact crash offset with a cyclic pattern (pwndbg/peda)python3 -c "import pwn; print(pwn.cyclic(500).decode())" | ./bluehammer
# Use ltrace/strace to trace library/syscallsstrace ./bluehammer <args>ltrace ./bluehammer <args>
# Check binary protectionschecksec --file=./bluehammer# or with pwntools:python3 -c "from pwn import *; e = ELF('./bluehammer'); print(e)"

# Run under GDB to catch crashesgdb ./bluehammer(gdb) run <args>(gdb) bt          # backtrace on crash(gdb) info registers
# Find the exact crash offset with a cyclic pattern (pwndbg/peda)python3 -c "import pwn; print(pwn.cyclic(500).decode())" | ./bluehammer
# Use ltrace/strace to trace library/syscallsstrace ./bluehammer <args>ltrace ./bluehammer <args>
# Check binary protectionschecksec --file=./bluehammer# or with pwntools:python3 -c "from pwn import *; e = ELF('./bluehammer'); print(e)"

Python harness for iterating on the PoC

python

#!/usr/bin/env python3"""Harness for testing BlueHammer PoC variants.Run in an isolated lab environment only."""import subprocessimport structimport os
BINARY = "./bluehammer"OFFSET = 264  # adjust via debugging
def build_payload(offset: int, ret_addr: int, shellcode: bytes = b"") -> bytes:    padding = b"A" * offset    addr_packed = struct.pack("<Q", ret_addr)  # little-endian 64-bit    return padding + addr_packed + shellcode
def run_payload(payload: bytes) -> tuple[int, bytes, bytes]:    """Send payload to the binary, return (returncode, stdout, stderr)."""    result = subprocess.run(        [BINARY],        input=payload,        capture_output=True,        timeout=5,    )    return result.returncode, result.stdout, result.stderr
def find_offset(max_size: int = 1024) -> int:    """Brute-force the crash offset."""    for size in range(16, max_size, 8):        payload = b"A" * size        try:            rc, _, _ = run_payload(payload)            if rc != 0:                print(f"[+] Crash at size: {size}")                return size        except subprocess.TimeoutExpired:            print(f"[!] Timeout at size: {size}")    return -1
if __name__ == "__main__":    print("[*] Testing BlueHammer PoC")    payload = build_payload(OFFSET, 0x4141414141414141)    rc, out, err = run_payload(payload)    print(f"Return code: {rc}")    print(f"Stdout: {out}")    print(f"Stderr: {err}")

#!/usr/bin/env python3"""Harness for testing BlueHammer PoC variants.Run in an isolated lab environment only."""import subprocessimport structimport os
BINARY = "./bluehammer"OFFSET = 264  # adjust via debugging
def build_payload(offset: int, ret_addr: int, shellcode: bytes = b"") -> bytes:    padding = b"A" * offset    addr_packed = struct.pack("<Q", ret_addr)  # little-endian 64-bit    return padding + addr_packed + shellcode
def run_payload(payload: bytes) -> tuple[int, bytes, bytes]:    """Send payload to the binary, return (returncode, stdout, stderr)."""    result = subprocess.run(        [BINARY],        input=payload,        capture_output=True,        timeout=5,    )    return result.returncode, result.stdout, result.stderr
def find_offset(max_size: int = 1024) -> int:    """Brute-force the crash offset."""    for size in range(16, max_size, 8):        payload = b"A" * size        try:            rc, _, _ = run_payload(payload)            if rc != 0:                print(f"[+] Crash at size: {size}")                return size        except subprocess.TimeoutExpired:            print(f"[!] Timeout at size: {size}")    return -1
if __name__ == "__main__":    print("[*] Testing BlueHammer PoC")    payload = build_payload(OFFSET, 0x4141414141414141)    rc, out, err = run_payload(payload)    print(f"Return code: {rc}")    print(f"Stdout: {out}")    print(f"Stderr: {err}")

Troubleshooting

PoC doesn't crash / no effect

The author acknowledged bugs in the PoC — read the source carefully for off-by-one errors, wrong size calculations, or incorrect offsets.
Recompile without mitigations: -fno-stack-protector -no-pie -z execstack
Check if ASLR is interfering: echo 0 | sudo tee /proc/sys/kernel/randomize_va_space (lab only, revert after)

Compilation errors

bash

# Missing headers — check what the source includes and install dev packagessudo apt install build-essential libc6-dev
# Link errorsgcc bluehammer.c -o bluehammer -lpthread -lm

# Missing headers — check what the source includes and install dev packagessudo apt install build-essential libc6-dev
# Link errorsgcc bluehammer.c -o bluehammer -lpthread -lm

Segfault immediately on run

bash

# Run with ASAN to get detailed crash infogcc -fsanitize=address -g -o bluehammer_asan bluehammer.c./bluehammer_asan <args>

# Run with ASAN to get detailed crash infogcc -fsanitize=address -g -o bluehammer_asan bluehammer.c./bluehammer_asan <args>

PGP verification fails

bash

# Ensure you have the full key fingerprintgpg --list-keys FFoRCS0# Re-fetch if neededgpg --keyserver hkps://keys.openpgp.org --recv-keys <full-fingerprint>

# Ensure you have the full key fingerprintgpg --list-keys FFoRCS0# Re-fetch if neededgpg --keyserver hkps://keys.openpgp.org --recv-keys <full-fingerprint>

Lab Environment Setup (Recommended)

bash

# Use a dedicated VM or container — never run on production systemsdocker run -it --rm \    --cap-add SYS_PTRACE \    --security-opt seccomp=unconfined \    ubuntu:22.04 bash
# Inside containerapt update && apt install -y gcc gdb python3 python3-pip strace ltrace binutilspip3 install pwntools
git clone https://github.com/Nightmare-Eclipse/BlueHammer.gitcd BlueHammer

# Use a dedicated VM or container — never run on production systemsdocker run -it --rm \    --cap-add SYS_PTRACE \    --security-opt seccomp=unconfined \    ubuntu:22.04 bash
# Inside containerapt update && apt install -y gcc gdb python3 python3-pip strace ltrace binutilspip3 install pwntools
git clone https://github.com/Nightmare-Eclipse/BlueHammer.gitcd BlueHammer

Key Facts

Source and attribution

Source:reason-machines/trending-skillsinskills/bluehammer-vulnerability-pocat commit2384a00

License: No license

Content belongs to its original authors. SourceWeft indexes it from a public repository.

Report or request removal

Property	Value
Language	C
License	MIT
Stars	606
Forks	228
Known bugs in PoC	Yes (author confirmed)
PGP signed	Yes (SHA-512, Ed25519)

Bluehammer Vulnerability Poc

BlueHammer Vulnerability PoC

⚠️ Important Notice

What BlueHammer Does

Getting the Code

Verify PGP Signature (Recommended)

Building the PoC

Single-file build

Common C build flags for vulnerability PoCs

Running the PoC

Code Patterns — Working with C Vulnerability PoCs

Reading and understanding the vulnerability trigger

Analyzing the PoC for bugs (author noted known bugs)

Sending a crafted payload

Debugging a non-working PoC

Python harness for iterating on the PoC

Troubleshooting

PoC doesn't crash / no effect

Compilation errors

Segfault immediately on run

PGP verification fails

Lab Environment Setup (Recommended)

Key Facts

Source and attribution

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