CVE-2022-24825: Smokescreen SSRF via deny list bypass

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-19 · updated 2026-06-17
Weakness: CWE-918

Description

Smokescreen is a simple HTTP proxy that fogs over naughty URLs. 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 appending a dot to the end of user-supplied URLs, or by providing input in a different letter case. Recommended to upgrade Smokescreen to version 0.0.3 or later.

Affected products

stripe smokescreen: before 0.0.3 — fixed in 0.0.3

How to fix

Upgrade to a fixed version: stripe smokescreen 0.0.3. Check the vendor advisory for mitigations.

References

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