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CVE-2021-41136— Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in puma

Quick assessment

Affected
puma puma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Puma是美国Evan Phoenix个人开发者的一款针对高并发应用的Web服务器。 Puma存在环境问题漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。

CVSS 3.7 · Low EPSS 1.20% · P65
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I. Basic Information for CVE-2021-41136

Vulnerability Information
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Vulnerability Title
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in puma
Source: CVE Program / CVE List V5
Vulnerability Description
Puma is a HTTP 1.1 server for Ruby/Rack applications. Prior to versions 5.5.1 and 4.3.9, using `puma` with a proxy which forwards HTTP header values which contain the LF character could allow HTTP request smugggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. The only proxy which has this behavior, as far as the Puma team is aware of, is Apache Traffic Server. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This vulnerability was patched in Puma 5.5.1 and 4.3.9. As a workaround, do not use Apache Traffic Server with `puma`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Puma是美国Evan Phoenix个人开发者的一款针对高并发应用的Web服务器。 Puma存在环境问题漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
puma puma >= 5.0.0, < 5.5.1 -

II. Public POCs for CVE-2021-41136

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III. Intelligence Information for CVE-2021-41136

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Patches & Fixes for CVE-2021-41136 (1)

Vendor Advisories for CVE-2021-41136 (3)

Mailing List Discussions for CVE-2021-41136 (1)

IV. Related Vulnerabilities

Same product: puma
Same vendor: puma
Same weakness: CWE-444

V. Comments for CVE-2021-41136

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