reverser-firmware
Router / IoT firmware extraction pipeline — unpack nested filesystems, locate web server, identify backdoor credentials.
소스 정보
- 저장소
- BitterSecurity/Decepticon
- 최근 소스 활동
- 2026년 6월 2일 17:48
- 감지된 SKILL.md 언어
- 영어
- 스타
- 5,565
- 포크
- 1,053
설치 방법
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소스 파일 검토
설치 여부를 결정하기 전에 SKILL.md와 SkillsMP에 표시된 보조 파일을 읽어 보세요.
SKILL.md 표시 중
SKILL.md
소스 지침 · 읽기 전용 미리보기- name
- reverser-firmware
- description
- Router / IoT firmware extraction pipeline — unpack nested filesystems, locate web server, identify backdoor credentials.
- metadata
- {"subdomain":"reverse-engineering","when_to_use":"firmware extraction router iot binwalk nested filesystem web server backdoor credential squashfs cramfs","mitre_attack":["T1542","T1078.001"]}
# Firmware Extraction Playbook
## 1. Extract
```bash
apt-get install -y binwalk squashfs-tools cramfsprogs
mkdir -p /workspace/fw && cd /workspace/fw
binwalk -eM /workspace/firmware.bin
find _firmware.bin.extracted -name "squashfs-root" -o -name "rootfs"
```
## 2. Map the root
```bash
ROOT=$(find _firmware.bin.extracted -type d -name "squashfs-root" | head -1)
ls -la "$ROOT/etc/"
cat "$ROOT/etc/passwd" # look for hardcoded users
cat "$ROOT/etc/shadow" # password hashes — feed to hashcat
cat "$ROOT/etc/init.d/S*" 2>/dev/null
cat "$ROOT/etc/rc.d/rc.local" 2>/dev/null
```
## 3. Web server binary
```bash
find "$ROOT" -name "httpd" -o -name "lighttpd" -o -name "nginx" -o -name "boa"
# For each: bin_identify + bin_strings + bin_symbols_report
```
CGI binaries under `www/cgi-bin/` are the highest-yield targets — often
one file per endpoint with direct `system()` calls from query params.
## 4. Hardcoded credentials
```
bin_strings(path=web_server_binary, category_filter="secret")
bin_strings(path=web_server_binary, category_filter="crypto")
```
Also check for base64 / hex key patterns near `strcmp` calls (manual
audit via Ghidra — use `bin_ghidra_script` to seed).
## 5. Authentication bypass audit
Look for:
- Magic string comparisons (`strcmp(user, "admin")`)
- Debug backdoor paths (`/debug`, `/cgi-bin/shell`, `.sys`)
- UART/JTAG enabled in bootargs (check `bootargs.txt` in extraction)
## 6. Cross-reference CVEs
For the extracted busybox / kernel / dropbear / openssl versions:
```
cve_by_package("busybox", "1.27.2", "OSS-Fuzz")
cve_lookup("CVE-2021-28831,CVE-2023-0464")
```
## 7. Record
Add:
- `repo` node for the firmware image
- `file` nodes for each interesting binary
- `credential` nodes for any hardcoded creds
- `vulnerability` nodes for each audit finding
- `entrypoint` for each cgi-bin path
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