Full authentication bypass if SASL authorization username is specified

緊急 9.8CVE-2023-27582 · GHSA-4g76-w3xw-2x6w · GO-2023-1630 · 13/03/2023 公開 · 17/06/2026 更新

要点

CVE-2023-27582 は github.com/foxcpp/maddy, maddy (maddy project) に影響する深刻度「緊急」 (CVSS 9.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.0%（全脆弱性の 63.5% より高い）。
対処：0.6.3 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/foxcpp/maddy Go	`≥ 0.2.0, < 0.6.3`	`0.6.3`
maddy maddy_project	`≥ 0.2.0, < 0.6.3`	`0.6.3`

概要

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

NVD の説明

maddy is a composable, all-in-one mail server. Starting with version 0.2.0 and prior to version 0.6.3, maddy allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified username, it is accepted as is after checking the credentials for the authentication username. maddy 0.6.3 includes the fix for the bug. There are no known workarounds.