CVE-2022-27255 - Realtek eCos SDK SIP ALG buffer overflow

This repository contains the materials for the talk "Exploring the hidden attack surface of OEM IoT devices: pwning thousands of routers with a vulnerability in Realtek’s SDK for eCos OS.", which was presented at DEFCON30.

The contents of this repo include:

• analysis: Automated firmware analysis to detect the presence of CVE-2022-27255 (Run analyse_firmware.py).
• exploits_nexxt: PoC and exploit code. The PoC should work on every affected router, however the exploit code is specific for the Nexxt Nebula 300 Plus router.
• ghidra_scripts: Vulnerable function call searching script and CVE-2022-27255 detection script.
• DEFCON: Slide deck & poc video.

Vulnerable devices:

• Nexxt Nebula 300 Plus
• Tenda F6 V5.0
• Tenda F3 V3
• Tenda F9 V2.0
• Tenda AC5 V3.0
• Tenda AC6 V5.0
• Tenda AC7 V4.0
• Tenda A9 V3
• Tenda AC8 V2.0
• Tenda AC10 V3
• Tenda AC11 V2.0
• Tenda FH456 V4.0
• Zyxel NBG6615 V1.00
• Intelbras RF 301K V1.1.15
• Multilaser AC1200 RE018
• iBall 300M-MIMO (iB-WRB303N)
• Brostrend AC1200 extender
• MT-Link MT-WR850N
• MT-Link MT-WR950N
• Everest EWR-301
• D-Link DIR-822 h/w version B
• Speedefy K4
• Ultra-Link Wireless N300 Universal Range Extender
• Keo KLR 301
• QPCOM QP-WR347N
• NEXT 504N
• Nisuta NS-WIR303N (probably V2)
• Rockspace AC2100 Dual Band Wi-Fi Range Extender
• KNUP KP-R04
• Hikvision DS-3WR12-E

If you find a new vulnerable device, please submit a pull request.

Acknowledgements

• Octavio Gianatiempo (@ogianatiempo).
• Octavio Galland (@GallandOctavio)
• Javier Aguinaga (@pastaCLS)
• Emilio Couto (@ekio_jp)

Corrections:

• @munchkindev