r0bre Profile picture
Dec 9 7 tweets 2 min read
How to find router WAN 0dayz in 2022, a quick and easy guide 🧵

#pwn2own #bugbountytips
1. Pick a router, download the firmware, extract the filesystem
2. Search all executables/libraries/scripts for curl -k, wget --no-check-certificate, and variations thereof (curl_easy_setopt etc)

Attackers can intercept those connections
3. See how the response is handled. I've seen:
- custom json parsers memory corruptions
- stack buffer overflows
- straight up executing the response as a script
- command injection from some response parameter
You're practically done. Routers often have most mitigations disabled, so exploits should be a walk in the park.
Obviously there are other (harder?) techniques.
- Firewall bypass/Internet exposed services
- UDP response forging
- Custom kernel modules
- Packet inspection/custom nftables modules

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More from @r0bre

Dec 9
So essentially the same bug was present in netgears urlfilterd, a service that allows users to block http traffic to specific domains.
It was implemented through a custom netfilter that would parse any http packet looking for the HOST header, comparing it to a list of forbidden sites.
Funnily they would log blocked/allowed requests with a system call that was vuln to command injection lol
Read 8 tweets

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