High advisory for CFNext

Advisory overview

CFNext before 3.1.0 contains a weak cryptographic derivation vulnerability that allows subscription link holders to recover the admin password because the subscription UUID is an MD5 of the password with a fixed public salt. Attackers can brute-force the password offline without rate limiting, log into the admin panel, and read stored Trojan, Clash, Telegram and Cloudflare API secrets.

Related references

• https://github.com/PAICNI/CFNext
• https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L12
• https://github.com/PAICNI/CFNext/blob/1c7b3d8bed5b06a1449ea28302bb9a648f67e8e1/CFNext-%E6%98%8E%E6%96%87%E7%89%88.js#L2440
• https://github.com/PAICNI/CFNext/commit/ca8ad82bb7c635f765c82a1cd0c954fd70d81fb7
• https://github.com/PAICNI/CFNext/issues/57
• https://www.vulncheck.com/advisories/cfnext-before-3.1.0-admin-password-recovery-via-md5-derived-subscription-uuid