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 :
Oct. 12, 2022, 1:30 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
1.2
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41136.
| URL | Resource |
|---|---|
| https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f | Patch Third Party Advisory |
| https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html | Mailing List Third Party Advisory |
| https://security.gentoo.org/glsa/202208-28 | Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5146 | Third Party Advisory |
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 [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
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.
0.25 }} 0.12%
score
0.62501
percentile