Vulnerability · Published Sep 2, 2022 · Assigned by GitHub_M
CVE-2022-36071Recovery codes abuse in SFTPGo
High 8.3
In plain English
A high-severity improper authentication in sftpgo from drakkan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/drakkan/sftpgo | no fix listed | GO-2022-0964 |
| Go | github.com/drakkan/sftpgo/v2 | 2.3.4 | GHSA-54qx-8p8w-xhg8 |
| Go | github.com/drakkan/sftpgo/v2 | 2.3.4 | GO-2022-0964 |
Affected products (as reported)
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
References
- https://github.com/drakkan/sftpgo/security/advisories/GHSA-54qx-8p8w-xhg8 x_refsource_CONFIRM
- https://github.com/drakkan/sftpgo/issues/965 x_refsource_MISC