// For flags

CVE-2024-21647

HTTP Request/Response Smuggling in puma

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.

Puma es un servidor web para aplicaciones Ruby/Rack creado para el paralelismo. Antes de la versión 6.4.2, Puma exhibía un comportamiento incorrecto al analizar cuerpos de codificación de transferencia fragmentados de una manera que permitía el contrabando de solicitudes HTTP. Las versiones fijas limitan el tamaño de las extensiones de fragmentos. Sin este límite, un atacante podría provocar un consumo ilimitado de recursos (CPU, ancho de banda de red). Esta vulnerabilidad se ha solucionado en las versiones 6.4.2 y 5.6.8.

A flaw was found in Puma rubygem. Versions prior 6.4.2 are susceptible to a HTTP smuggling attack when parsing chunked transfer encoding bodies on HTTP messages, which don't limit the size of the message chunk extensions. This issue may lead to uncontrolled resource consumption, possibly resulting in a denial of service of the attacked server.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-12-29 CVE Reserved
  • 2024-01-08 CVE Published
  • 2024-01-18 EPSS Updated
  • 2024-08-01 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Puma
Search vendor "Puma"
Puma
Search vendor "Puma" for product "Puma"
< 5.6.8
Search vendor "Puma" for product "Puma" and version " < 5.6.8"
ruby
Affected
Puma
Search vendor "Puma"
Puma
Search vendor "Puma" for product "Puma"
>= 6.0.0 < 6.4.2
Search vendor "Puma" for product "Puma" and version " >= 6.0.0 < 6.4.2"
ruby
Affected