Vulnerability · Published May 20, 2022 · Assigned by GitHub_M
CVE-2022-29188Smokescreen SSRF via deny list bypass (square brackets) in Smokescreen
Medium 5.3
In plain English
A medium-severity server-side request forgery in smokescreen from stripe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/stripe/smokescreen | 0.0.4 | GHSA-qwrf-gfpj-qvj6 |
| Go | github.com/stripe/smokescreen | 0.0.4 | GO-2022-0459 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| stripe | smokescreen | < 0.0.4 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N