3.7
LOW
CVE-2021-41136
"Puma Apache Traffic Server HTTP Request Smuggling"
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`.

INFO

Published Date :

Oct. 12, 2021, 4:15 p.m.

Last Modified :

Nov. 21, 2024, 6:25 a.m.

Remotely Exploitable :

Yes !

Impact Score :

2.5

Exploitability Score :

1.2
Affected Products

The following products are affected by CVE-2021-41136 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Debian debian_linux
1 Puma puma
References to Advisories, Solutions, and Tools

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-41136 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-41136 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f
    Added Reference https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx
    Added Reference https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html
    Added Reference https://security.gentoo.org/glsa/202208-28
    Added Reference https://www.debian.org/security/2022/dsa-5146
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Oct. 12, 2022

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html Mailing List, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202208-28 No Types Assigned https://security.gentoo.org/glsa/202208-28 Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2022/dsa-5146 No Types Assigned https://www.debian.org/security/2022/dsa-5146 Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Aug. 27, 2022

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html [No Types Assigned]
  • CVE Modified by [email protected]

    Aug. 15, 2022

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202208-28 [No Types Assigned]
  • CVE Modified by [email protected]

    May. 24, 2022

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2022/dsa-5146 [No Types Assigned]
  • Reanalysis by [email protected]

    Oct. 27, 2021

    Action Type Old Value New Value
    Removed CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:P/A:N)
    Added CVSS V2 NIST (AV:N/AC:H/Au:S/C:P/I:P/A:N)
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
    Added CVSS V3.1 NIST AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
  • Initial Analysis by [email protected]

    Oct. 19, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
    Changed Reference Type https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f No Types Assigned https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f Patch, Third Party Advisory
    Changed Reference Type https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx No Types Assigned https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:* versions up to (including) 4.3.8 *cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:* versions from (including) 5.0.0 up to (including) 5.5.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-41136 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-41136 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.13 }} -0.12%

score

0.48513

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability