Smokescreen SSRF via deny list bypass (square brackets)

中 6.5CVE-2022-29188 · GHSA-qwrf-gfpj-qvj6 · GO-2022-0459 · 21/05/2022 公開 · 17/06/2026 更新

要点

CVE-2022-29188 は github.com/stripe/smokescreen, smokescreen (stripe) に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.87%（全脆弱性の 58.9% より高い）。
対処：0.0.4 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/stripe/smokescreen Go	`< 0.0.4`	`0.0.4`
smokescreen stripe	`< 0.0.4`	`0.0.4`

概要

Impact

The primary use case for Smokescreen is to prevent server-side request forgery (SSRF) attacks in which external attackers leverage the behavior of applications to connect to or scan internal infrastructure.

Smokescreen also offers an option to deny access to additional (e.g., external) URLs by way of a deny list. There was an issue in Smokescreen that made it possible to bypass the deny list feature by surrounding the hostname with square brackets (e.g. [example.com]).

Recommendation

Upgrade Smokescreen to version 0.0.4 or later.

Acknowledgements

Thanks to Axel Chong for reporting the issue.

For more information

Email us at [email protected]

NVD の説明

Smokescreen is an HTTP proxy. The primary use case for Smokescreen is to prevent server-side request forgery (SSRF) attacks in which external attackers leverage the behavior of applications to connect to or scan internal infrastructure. Smokescreen also offers an option to deny access to additional (e.g., external) URLs by way of a deny list. There was an issue in Smokescreen that made it possible to bypass the deny list feature by surrounding the hostname with square brackets (e.g. `[example.com]`). This only impacted the HTTP proxy functionality of Smokescreen. HTTPS requests were not impacted. Smokescreen version 0.0.4 contains a patch for this issue.