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Vulnerability Details : CVE-2021-41136

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`.
Publish Date : 2021-10-12 Last Update Date : 2022-10-12
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- CVSS Scores & Vulnerability Types

CVSS Score
3.6
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication ???
Gained Access None
Vulnerability Type(s)
CWE ID 444

- Products Affected By CVE-2021-41136

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
3 Application Puma Puma * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Puma Puma 1

- References For CVE-2021-41136

https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html
MLIST [debian-lts-announce] 20220827 [SECURITY] [DLA 3083-1] puma security update
https://www.debian.org/security/2022/dsa-5146
DEBIAN DSA-5146
https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx CONFIRM
https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f
https://security.gentoo.org/glsa/202208-28
GENTOO GLSA-202208-28

- Metasploit Modules Related To CVE-2021-41136

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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