GHSA-4g76-w3xw-2x6w

Full authentication bypass if SASL authorization username is specified

Source: GitHub Advisory Database (reviewed) Critical CVE-2023-27582

Packages

Ecosystem	Package	Affected	Fixed in
Go	github.com/foxcpp/maddy	>= 0.2.0, < 0.6.3	0.6.3

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact maddy 0.2.0 - 0.6.2 allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified authorization username, it is accepted as is after checking the credentials for the authentication username. ### Patches maddy 0.6.3 includes the fix for the bug. ### Workarounds There is no way to fix the issue without upgrading. ### References * Commit that introduced the vulnerable code: https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399a * Fix: https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9c

References

External links from the advisory. They lead to third-party sites.