Recovery codes abuse in SFTPGo

SFTPGo is configurable SFTP server with optional HTTP/S, FTP/S and WebDAV support. SFTPGo WebAdmin and WebClient support login using TOTP (Time-based One Time Passwords) as a secondary authentication factor. Because TOTPs are often configured on mobile devices that can be lost, stolen or damaged, SFTPGo also supports recovery codes. These are a set of one time use codes that can be used instead of the TOTP. In SFTPGo versions from version 2.2.0 to 2.3.3 recovery codes can be generated before enabling two-factor authentication. An attacker who knows the user's password could potentially generate some recovery codes and then bypass two-factor authentication after it is enabled on the account at a later time. This issue has been fixed in version 2.3.4. Recovery codes can now only be generated after enabling two-factor authentication and are deleted after disabling it.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

认证机制不恰当

SFTPGo 授权问题漏洞

SFTPGo是意大利Nicola Murino个人开发者的一个功能齐全且高度可配置的 SFTP 服务器。 SFTPGo 2.2.0版本至2.3.3版本存在授权问题漏洞，该漏洞源于 TOTP 通常配置在可能丢失、被盗或损坏的移动设备上。

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