// For flags

CVE-2022-29188

Smokescreen SSRF via deny list bypass (square brackets) in Smokescreen

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Smokescreen es un proxy HTTP. El principal caso de uso de Smokescreen es evitar los ataques de tipo server-side request forgery (SSRF) en los que atacantes externos aprovechan el comportamiento de las aplicaciones para conectarse o explorar la infraestructura interna. Smokescreen también ofrece una opción para denegar el acceso a URLs adicionales (por ejemplo, externas) mediante una lista de denegación. Se presentaba un problema en Smokescreen que permitía omitir la función de lista de denegación rodeando el nombre de host con corchetes (por ejemplo, "[ejemplo.com]"). Esto sólo afectaba a la funcionalidad de proxy HTTP de Smokescreen. Las peticiones HTTPS no están afectadas. Smokescreen versión 0.0.4 contiene un parche para este problema

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-04-13 CVE Reserved
  • 2022-05-20 CVE Published
  • 2023-12-11 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-918: Server-Side Request Forgery (SSRF)
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Stripe
Search vendor "Stripe"
 Smokescreen
Search vendor "Stripe" for product "Smokescreen"
 < 0.0.4
Search vendor "Stripe" for product "Smokescreen" and version " < 0.0.4"
-
Affected